πŸ“š Calculator Guides & Tools

Comprehensive guides for our professional calculation tools

πŸ” Find Your Calculator

Showing all 107 calculators

⭐ Most Popular Calculators

Age Calculator

Calculate your exact age in years, months, and days from your birth date.

Born on January 15, 1990 β†’ Age: 35 years, 0 months, 1 day (as of Jan 16, 2025)
Calculate Now β†’

BMI Calculator

Calculate your Body Mass Index to assess if your weight is in a healthy range.

70kg, 175cm β†’ BMI: 22.9 (Normal weight)
Calculate Now β†’

Circle Area

Calculate the area of a circle using its radius for geometry and...

Circle with radius 5 units β†’ Area: 78.54 square units
Calculate Now β†’

Loan Payment

Calculate monthly payments for loans including mortgages, car loans, and...

$20,000 loan at 6% for 5 years β†’ $386.66/month
Calculate Now β†’

Percentage Calculator

Calculate what percentage one number is of another, or find a percentage of a number.

25% of 200 = 50
Calculate Now β†’

Simple Interest

Calculate simple interest on loans, investments, or savings accounts.

$1,000 at 5% for 2 years β†’ Interest: $100, Total: $1,100
Calculate Now β†’

Physics

10 Calculators

Physics calculators for force, energy, motion, and scientific calculations. Useful for students, engineers, and science professionals.

Acceleration

Calculate acceleration from velocity change and time, or find missing values.

Key Features:
  • Acceleration = (Final Velocity - Initial Velocity) / Time
  • Perfect for: Physics problems, Vehicle performance
  • Instant accurate results
Example: Car accelerates from 0 to 30 m/s in 10 seconds β†’ 3 m/sΒ² acceleration
Use Calculator β†’

Density Calculator

Calculate density of materials and objects using mass and volume measurements.

Key Features:
  • Density = Mass / Volume
  • Perfect for: Material science, Engineering design
  • Instant accurate results
Example: 2kg object with 0.5mΒ³ volume β†’ Density: 4 kg/mΒ³
Use Calculator β†’

Force Calculator

Calculate force using Newton's second law of motion (F = ma).

Key Features:
  • Force = Mass Γ— Acceleration (F = ma)
  • Perfect for: Physics problems, Engineering
  • Instant accurate results
Example: 10 kg mass with 2 m/sΒ² acceleration β†’ Force: 20 N
Use Calculator β†’

Kinetic Energy

Calculate the kinetic energy of moving objects based on mass and velocity.

Key Features:
  • KE = Β½ Γ— mass Γ— velocityΒ²
  • Perfect for: Physics calculations, Engineering design
  • Instant accurate results
Example: 2kg object moving at 10 m/s β†’ KE = 100 Joules
Use Calculator β†’

Momentum

Calculate momentum of moving objects using mass and velocity.

Key Features:
  • Momentum = mass Γ— velocity
  • Perfect for: Physics problems, Collision analysis
  • Instant accurate results
Example: 10kg object at 5 m/s β†’ Momentum = 50 kgβ‹…m/s
Use Calculator β†’

Potential Energy

Calculate gravitational potential energy based on mass, height, and gravity.

Key Features:
  • PE = mass Γ— gravity Γ— height (g = 9.81 m/sΒ²)
  • Perfect for: Physics problems, Engineering calculations
  • Instant accurate results
Example: 5kg object at 10m height β†’ PE = 490.5 Joules
Use Calculator β†’

Power (Physics)

Calculate power in physics - the rate of energy transfer or work done per unit time.

Key Features:
  • Power = Work / Time = Energy / Time
  • Perfect for: Electrical engineering, Mechanical systems
  • Instant accurate results
Example: 1000 Joules of work in 10 seconds β†’ Power: 100 Watts
Use Calculator β†’

Pressure (Physics)

Calculate pressure exerted by force over an area.

Key Features:
  • Pressure = Force / Area
  • Perfect for: Engineering design, Hydraulic systems
  • Instant accurate results
Example: 100N force over 0.1mΒ² area β†’ Pressure: 1000 Pa
Use Calculator β†’

Speed Calculator

Calculate speed, distance, or time using the fundamental physics relationship.

Key Features:
  • Speed = Distance / Time
  • Perfect for: Travel planning, Physics problems
  • Instant accurate results
Example: 100 km in 2 hours β†’ Speed: 50 km/h
Use Calculator β†’

Work Calculator

Calculate work done when a force moves an object through a distance.

Key Features:
  • Work = Force Γ— Distance Γ— cos(angle)
  • Perfect for: Physics problems, Engineering calculations
  • Instant accurate results
Example: 50N force moving object 10m β†’ Work: 500 Joules
Use Calculator β†’

Date & Time

10 Calculators

Calculate ages, date differences, work days, and time-related calculations. Perfect for planning, scheduling, and time management.

Add Days to Date

Add or subtract days from any date to find a future or past date.

Key Features:
  • Result Date = Starting Date Β± Number of Days
  • Perfect for: Due date calculation, Deadline planning
  • Instant accurate results
Example: Jan 1, 2025 + 30 days = Jan 31, 2025
Use Calculator β†’

Age Calculator

Calculate your exact age in years, months, and days from your birth date.

Key Features:
  • Precise calculation including leap years
  • Results in years, months, and days format
  • Instant calculation from any birth date
Example: Born on January 15, 1990 β†’ Age: 35 years, 0 months, 1 day (as of Jan 16, 2025)
Use Calculator β†’

Age Difference

Calculate the age difference between two people or the time span between two dates.

Key Features:
  • Age Difference = |Date1 - Date2| calculated in years,...
  • Perfect for: Relationship planning, Sibling age gaps
  • Instant accurate results
Example: Person A born Jan 15, 1990 and Person B born Mar 22, 1985 β†’ 4 years, 10 months, 7 days difference
Use Calculator β†’

Countdown Timer

Count down days, hours, and minutes to any future event or deadline.

Key Features:
  • Time Remaining = Target DateTime - Current DateTime
  • Perfect for: Event planning, Project deadlines
  • Instant accurate results
Example: New Year 2026 β†’ 341 days, 15 hours, 23 minutes remaining
Use Calculator β†’

Day of Week

Find out what day of the week any date falls on.

Key Features:
  • Uses calendar algorithms to determine weekday
  • Perfect for: Historical research, Event planning
  • Instant accurate results
Example: January 1, 2025 falls on a Wednesday
Use Calculator β†’

Days Between Dates

Calculate the exact number of days between two dates.

Key Features:
  • Handles any date range from past to future
  • Accounts for leap years automatically
  • Instant calculation with exact day count
Example: Jan 1, 2025 to Jan 31, 2025 = 30 days
Use Calculator β†’

Leap Year Checker

Check if any year is a leap year with 366 days instead of 365.

Key Features:
  • Leap if: (year % 4 == 0 AND year % 100 != 0) OR (year % 400 == 0)
  • Perfect for: Calendar planning, Date calculations
  • Instant accurate results
Example: 2024 is a leap year
Use Calculator β†’

Next Birthday

Calculate how many days until your next birthday celebration.

Key Features:
  • Days = Next Birthday Date - Current Date
  • Perfect for: Birthday planning, Event countdowns
  • Instant accurate results
Example: Born July 15th, today is March 10th β†’ 127 days until next birthday
Use Calculator β†’

Time Zone Converter

Convert time between different time zones around the world.

Key Features:
  • New Time = Original Time + (Target Offset - Source Offset)
  • Perfect for: International meetings, Travel planning
  • Instant accurate results
Example: 2:00 PM EST (UTC-5) β†’ 8:00 PM GMT (UTC+0)
Use Calculator β†’

Work Days

Calculate the number of working days (excluding weekends) between two dates.

Key Features:
  • Counts only Monday through Friday, excludes Saturday and Sunday
  • Perfect for: Project planning, Payroll calculations
  • Instant accurate results
Example: Jan 1 to Jan 31, 2025 β†’ 23 working days
Use Calculator β†’

Health

12 Calculators

Health and fitness calculators for BMI, BMR, calories, and wellness tracking. Note: These are for informational purposes only - consult healthcare professionals for medical advice.

Alcohol Units

Calculate alcohol units in drinks to monitor safe consumption levels.

Key Features:
  • Alcohol Units = (Volume in ml Γ— ABV%) / 1000
  • Perfect for: Health monitoring, Safe drinking guidelines
  • Instant accurate results
Example: 500ml beer at 5% ABV β†’ 2.5 alcohol units
Use Calculator β†’

BMI Calculator

Calculate your Body Mass Index to assess if your weight is in a healthy range.

Key Features:
  • WHO standard BMI calculation formula
  • Automatic health category classification
  • Supports metric measurements (kg/cm)
Example: 70kg, 175cm β†’ BMI: 22.9 (Normal weight)
Use Calculator β†’

BMR Calculator

Calculate your Basal Metabolic Rate - calories your body burns at rest.

Key Features:
  • Uses Harris-Benedict equation (gold standard)
  • Gender-specific calculation formulas
  • Foundation for all diet and fitness planning
Example: Male, 30 years, 70kg, 175cm β†’ BMR: ~1,680 calories/day
Use Calculator β†’

Body Fat Percentage

Estimate body fat percentage using height, weight, and waist measurements.

Key Features:
  • Men: 64 - (20 Γ— height/waist), Women: 76 - (20 Γ— height/waist)
  • Perfect for: Fitness tracking, Health assessment
  • Instant accurate results
Example: Male: 180cm height, 85cm waist β†’ ~26% body fat
Use Calculator β†’

Calories Burned

Estimate calories burned during various physical activities and exercises.

Key Features:
  • Calories = MET Value Γ— Weight (kg) Γ— Duration (hours)
  • Perfect for: Weight loss planning, Fitness tracking
  • Instant accurate results
Example: 70kg person, 45 min moderate cycling β†’ ~315 calories burned
Use Calculator β†’

Carbs Needs

Calculate daily carbohydrate requirements based on weight and activity level.

Key Features:
  • Carbs = Weight Γ— Activity Multiplier (3-10g per kg)
  • Perfect for: Athletic nutrition, Diet planning
  • Instant accurate results
Example: 70kg moderately active person β†’ 350g carbs daily
Use Calculator β†’

Daily Water Intake

Calculate your daily water intake needs based on body weight and activity level.

Key Features:
  • Base Water = Weight Γ— 0.033 liters, Additional =...
  • Perfect for: Health maintenance, Fitness planning
  • Instant accurate results
Example: 70kg person with 1 hour exercise β†’ 2.8 liters (95 oz) daily
Use Calculator β†’

Fiber Needs

Calculate daily fiber requirements based on age and gender for optimal digestive health.

Key Features:
  • Men <50: 38g, Men 50+: 30g, Women <50: 25g, Women 50+: 21g
  • Perfect for: Digestive health, Diet planning
  • Instant accurate results
Example: 35-year-old male β†’ 38g fiber daily
Use Calculator β†’

Ideal Weight

Calculate your ideal body weight based on height and gender using medical formulas.

Key Features:
  • Men: 50 + 2.3 Γ— (height in inches - 60), Women: 45.5 +...
  • Perfect for: Health assessment, Weight management
  • Instant accurate results
Example: Male, 175cm height β†’ Ideal weight: ~70kg (154 lbs)
Use Calculator β†’

Protein Needs

Calculate your daily protein requirements based on weight and activity level.

Key Features:
  • Protein = Weight Γ— Activity Multiplier (0.8-2.0g per kg)
  • Perfect for: Nutrition planning, Fitness goals
  • Instant accurate results
Example: 70kg moderately active person β†’ 84g protein daily
Use Calculator β†’

Sleep Hours

Calculate sleep duration and sleep cycles based on bedtime and wake time.

Key Features:
  • Sleep Duration = Wake Time - Bedtime, Sleep Cycles =...
  • Perfect for: Sleep optimization, Health tracking
  • Instant accurate results
Example: Bedtime 10:30 PM, Wake 6:30 AM β†’ 8 hours sleep, 5.3 cycles
Use Calculator β†’

Target Heart Rate

Calculate your maximum heart rate and target heart rate zones for exercise.

Key Features:
  • Max HR = 220 - Age, Target Zone = 50-85% of Max HR
  • Perfect for: Cardio training, Fitness monitoring
  • Instant accurate results
Example: Age 30 β†’ Max HR: 190 bpm, Target Zone: 95-162 bpm
Use Calculator β†’

Unit Conversion

10 Calculators

Convert between different units of measurement including temperature, length, weight, volume, and more. Essential for international work and travel.

Area Converter

Convert between different area measurements including square meters, feet, acres, and hectares.

Key Features:
  • Converts through square meter base: 1 acre = 4,047 sq meters
  • Perfect for: Real estate, Land surveying
  • Instant accurate results
Example: 1 acre = 4,047 sq meters = 43,560 sq feet
Use Calculator β†’

Energy Converter

Convert between different energy units including Joules, calories, kWh, and BTU.

Key Features:
  • Base conversion: 1 kWh = 3.6 million Joules = 860 kcal
  • Perfect for: Energy billing, Engineering calculations
  • Instant accurate results
Example: 1 kWh = 3,600,000 Joules = 3,412 BTU
Use Calculator β†’

Length Converter

Convert between different units of length and distance measurements.

Key Features:
  • Converts through metric base units for accuracy
  • Perfect for: Construction, Engineering
  • Instant accurate results
Example: 1 meter = 3.28 feet = 39.37 inches
Use Calculator β†’

Power Converter

Convert between different power units including Watts, horsepower, and BTU/hour.

Key Features:
  • Base conversion: 1 HP = 746 Watts = 2,545 BTU/hr
  • Perfect for: Motor specifications, HVAC sizing
  • Instant accurate results
Example: 100 HP = 74,600 Watts = 254,500 BTU/hr
Use Calculator β†’

Pressure Converter

Convert between different pressure units including Pascals, PSI, bar, and atmospheres.

Key Features:
  • Base conversion: 1 atm = 101,325 Pa = 14.7 PSI = 1.01 bar
  • Perfect for: Tire pressure, Hydraulic systems
  • Instant accurate results
Example: 30 PSI = 206,843 Pa = 2.07 bar
Use Calculator β†’

Speed Converter

Convert speed between different units like mph, km/h, m/s, and knots.

Key Features:
  • Base conversion: 1 m/s = 3.6 km/h = 2.237 mph
  • Perfect for: Travel planning, Vehicle specifications
  • Instant accurate results
Example: 60 mph = 96.56 km/h = 26.82 m/s
Use Calculator β†’

Temperature Converter

Convert temperatures between Celsius, Fahrenheit, and Kelvin scales.

Key Features:
  • Β°F = (Β°C Γ— 9/5) + 32 Β°C = (Β°F - 32) Γ— 5/9 K = Β°C + 273.15
  • Perfect for: Weather conversion, Cooking recipes
  • Instant accurate results
Example: 25Β°C = 77Β°F = 298.15K
Use Calculator β†’

Time Converter

Convert between different time units from seconds to years.

Key Features:
  • Base conversions: 1 day = 24 hours = 1,440 minutes =...
  • Perfect for: Project planning, Scientific calculations
  • Instant accurate results
Example: 1 week = 7 days = 168 hours = 604,800 seconds
Use Calculator β†’

Volume Converter

Convert between different volume measurements including liters, gallons, cups, and more.

Key Features:
  • Converts through liter base unit: 1 gallon = 3.78541 liters
  • Perfect for: Cooking recipes, Fuel calculations
  • Instant accurate results
Example: 5 gallons = 18.93 liters = 20 quarts
Use Calculator β†’

Weight Converter

Convert weight and mass between different measurement systems.

Key Features:
  • Uses standard conversion factors: 1 kg = 2.20462 lbs
  • Perfect for: Health tracking, Shipping
  • Instant accurate results
Example: 70 kg = 154.32 lbs = 2,469 oz
Use Calculator β†’

Math

25 Calculators

Mathematical calculators covering geometry, algebra, statistics, and number theory. Essential tools for students, professionals, and everyday calculations.

Binary Converter

Convert decimal numbers to binary (base-2) representation.

Key Features:
  • Repeatedly divide by 2 and collect remainders
  • Perfect for: Computer science, Programming
  • Instant accurate results
Example: Decimal 25 β†’ Binary: 11001
Use Calculator β†’

Circle Area

Calculate the area of a circle using its radius for geometry and construction projects.

Key Features:
  • Uses precise Ο€ value (3.14159) for accuracy
  • Works with any unit of measurement
  • Essential for construction and engineering
Example: Circle with radius 5 units β†’ Area: 78.54 square units
Use Calculator β†’

Combination

Calculate combinations (nCr) - number of ways to choose r items from n items without regard to order.

Key Features:
  • C(n,r) = n! / (r! Γ— (n-r)!)
  • Perfect for: Probability calculations, Statistics
  • Instant accurate results
Example: Choose 3 items from 10 β†’ C(10,3) = 120 combinations
Use Calculator β†’

Cube Volume

Calculate the volume of a cube using the length of one side.

Key Features:
  • Volume = sideΒ³ (side Γ— side Γ— side)
  • Perfect for: Storage calculations, Packaging design
  • Instant accurate results
Example: Cube with 4-unit sides β†’ Volume: 64 cubic units
Use Calculator β†’

Cylinder Volume

Calculate the volume of a cylinder using radius and height.

Key Features:
  • Volume = Ο€ Γ— rΒ² Γ— h where r is radius and h is height
  • Perfect for: Tank capacity, Pipe volume
  • Instant accurate results
Example: Cylinder: radius 3 cm, height 10 cm β†’ Volume: 282.7 cubic cm
Use Calculator β†’

Distance Calculator

Calculate the distance between two points in a coordinate plane.

Key Features:
  • Distance = √[(x2-x1)Β² + (y2-y1)Β²]
  • Perfect for: Geometry problems, Navigation
  • Instant accurate results
Example: Point (0,0) to (3,4) β†’ Distance: 5 units
Use Calculator β†’

Factorial Calculator

Calculate the factorial of a number (n!).

Key Features:
  • n! = n Γ— (n-1) Γ— (n-2) Γ— ... Γ— 2 Γ— 1
  • Perfect for: Probability calculations, Combinatorics
  • Instant accurate results
Example: 5! = 5 Γ— 4 Γ— 3 Γ— 2 Γ— 1 = 120
Use Calculator β†’

Fibonacci Sequence

Generate the Fibonacci sequence up to n terms where each number is the sum of the two preceding ones.

Key Features:
  • F(n) = F(n-1) + F(n-2), starting with F(0)=0, F(1)=1
  • Perfect for: Mathematical education, Algorithm studies
  • Instant accurate results
Example: First 8 terms β†’ 0, 1, 1, 2, 3, 5, 8, 13
Use Calculator β†’

GCD Calculator

Find the Greatest Common Divisor (GCD) of two integers.

Key Features:
  • Uses Euclidean algorithm for efficient calculation
  • Perfect for: Number theory, Fraction simplification
  • Instant accurate results
Example: GCD of 48 and 18 β†’ 6
Use Calculator β†’

Hexadecimal Converter

Convert decimal numbers to hexadecimal (base-16) representation.

Key Features:
  • Repeatedly divide by 16 and collect remainders
  • Perfect for: Programming, Web development
  • Instant accurate results
Example: Decimal 255 β†’ Hexadecimal: FF
Use Calculator β†’

LCM Calculator

Find the Least Common Multiple (LCM) of two integers.

Key Features:
  • LCM = |a Γ— b| / GCD(a,b)
  • Perfect for: Fraction operations, Scheduling problems
  • Instant accurate results
Example: LCM of 12 and 18 β†’ 36
Use Calculator β†’

Octal Converter

Convert decimal numbers to octal (base-8) number system.

Key Features:
  • Repeatedly divide by 8 and collect remainders
  • Perfect for: Computer programming, Digital systems
  • Instant accurate results
Example: Decimal 64 β†’ Octal: 100
Use Calculator β†’

Percentage Calculator

Calculate what percentage one number is of another, or find a percentage of a number.

Key Features:
  • Handles both percentage calculation types
  • Works with decimals and whole numbers
  • Essential for shopping and finance
Example: 25% of 200 = 50
Use Calculator β†’

Percentage Change

Calculate the percentage increase or decrease between two values.

Key Features:
  • Percentage Change = ((New Value - Old Value) / Old Value) Γ— 100
  • Perfect for: Financial analysis, Performance tracking
  • Instant accurate results
Example: From 50 to 75 β†’ +50% increase
Use Calculator β†’

Permutation

Calculate permutations (nPr) - number of ways to arrange r items from n items where order matters.

Key Features:
  • P(n,r) = n! / (n-r)!
  • Perfect for: Probability theory, Combinatorics
  • Instant accurate results
Example: Arrange 3 items from 10 β†’ P(10,3) = 720 permutations
Use Calculator β†’

Prime Number Checker

Check if a number is prime (only divisible by 1 and itself).

Key Features:
  • Tests divisibility up to √n for efficiency
  • Perfect for: Number theory, Cryptography
  • Instant accurate results
Example: 17 is prime
Use Calculator β†’

Pythagorean Theorem

Calculate missing sides of right triangles using the Pythagorean theorem.

Key Features:
  • Fundamental theorem for right triangles
  • Works with any two known sides
  • Essential for construction and engineering
Example: Sides 3 and 4 β†’ Hypotenuse: 5
Use Calculator β†’

Quadratic Equation

Solve quadratic equations of the form axΒ² + bx + c = 0 using the quadratic formula.

Key Features:
  • x = [-b Β± √(bΒ² - 4ac)] / 2a
  • Perfect for: Algebra homework, Engineering calculations
  • Instant accurate results
Example: 2xΒ² + 5x - 3 = 0 β†’ x = 0.5 or x = -3
Use Calculator β†’

Random Number

Generate random numbers within a specified range for various applications.

Key Features:
  • Random integer between min and max (inclusive)
  • Perfect for: Games and contests, Statistical sampling
  • Instant accurate results
Example: Range 1-100 β†’ Random number: 47
Use Calculator β†’

Rectangle Area

Calculate the area of a rectangle by multiplying its length and width.

Key Features:
  • Area = Length Γ— Width
  • Perfect for: Room measurements, Flooring calculations
  • Instant accurate results
Example: Rectangle 12Γ—8 meters β†’ Area: 96 square meters
Use Calculator β†’

Roman Numeral

Convert numbers between decimal and Roman numeral systems.

Key Features:
  • Uses place values: M=1000, D=500, C=100, L=50, X=10, V=5, I=1
  • Perfect for: Historical dates, Clock faces
  • Instant accurate results
Example: 1994 β†’ MCMXCIV
Use Calculator β†’

Slope Calculator

Calculate the slope of a line passing through two points.

Key Features:
  • Slope = (y2 - y1) / (x2 - x1)
  • Perfect for: Algebra problems, Engineering
  • Instant accurate results
Example: Points (1,2) and (3,8) β†’ Slope: 3
Use Calculator β†’

Sphere Volume

Calculate the volume of a sphere using its radius.

Key Features:
  • Volume = (4/3) Γ— Ο€ Γ— rΒ³ where r is the radius
  • Perfect for: Engineering design, Manufacturing
  • Instant accurate results
Example: Sphere with radius 5 cm β†’ Volume: 523.6 cubic cm
Use Calculator β†’

Trapezoid Area

Calculate the area of a trapezoid using parallel sides and height.

Key Features:
  • Area = Β½ Γ— (base1 + base2) Γ— height
  • Perfect for: Geometry problems, Land surveying
  • Instant accurate results
Example: Trapezoid: base1=8, base2=12, height=5 β†’ Area: 50 square units
Use Calculator β†’

Triangle Area

Calculate the area of a triangle using base and height measurements.

Key Features:
  • Area = (Base Γ— Height) / 2
  • Perfect for: Geometry homework, Construction planning
  • Instant accurate results
Example: Triangle with base 10 units and height 8 units β†’ Area: 40 square units
Use Calculator β†’

Education

5 Calculators

Academic calculators for GPA, grades, and educational planning. Perfect for students, teachers, and academic administrators.

CGPA Calculator

Calculate Cumulative Grade Point Average from multiple semester GPAs.

Key Features:
  • CGPA = Sum of all GPAs / Number of semesters
  • Perfect for: Academic tracking, College applications
  • Instant accurate results
Example: Semester GPAs: 3.5, 3.8, 3.2, 3.9 β†’ CGPA: 3.6
Use Calculator β†’

Final Grade Needed

Calculate what grade you need on the final exam to achieve your desired course grade.

Key Features:
  • Required = (Desired - Current Γ— (100 - Weight)) / Weight
  • Perfect for: Academic planning, Grade management
  • Instant accurate results
Example: Current: 78%, Want: 85%, Final worth 30% β†’ Need 101.3% (not achievable)
Use Calculator β†’

GPA Calculator

Calculate your Grade Point Average from letter grades.

Key Features:
  • GPA = Sum of Grade Points / Number of Grades A=4.0,...
  • Perfect for: Academic planning, College applications
  • Instant accurate results
Example: Grades A, B+, A-, B β†’ GPA: 3.5
Use Calculator β†’

Grade Calculator

Calculate percentage grades and letter grades from points earned.

Key Features:
  • Percentage = (Points Earned / Total Points) Γ— 100
  • Perfect for: Test grading, Assignment evaluation
  • Instant accurate results
Example: 85 out of 100 points β†’ 85% (B)
Use Calculator β†’

Test Score

Calculate test score percentage from correct answers and total questions.

Key Features:
  • Score = (Correct Answers / Total Questions) Γ— 100
  • Perfect for: Test grading, Quiz scoring
  • Instant accurate results
Example: 85 correct out of 100 questions β†’ 85% (B grade)
Use Calculator β†’

Automotive

5 Calculators

Vehicle-related calculators for fuel efficiency, costs, and automotive planning. Great for car owners and transportation planning.

Car Loan

Calculate monthly payments for auto loans including interest and principal.

Key Features:
  • Payment = [P Γ— r(1+r)^n] / [(1+r)^n - 1]
  • Perfect for: Car buying, Budget planning
  • Instant accurate results
Example: $25,000 car, $5,000 down, 6% for 5 years β†’ $386.66/month
Use Calculator β†’

Fuel Cost

Calculate the cost of fuel for your trip or commute.

Key Features:
  • Fuel Cost = (Distance / MPG) Γ— Price per Gallon
  • Perfect for: Trip budgeting, Commute costs
  • Instant accurate results
Example: 500 mile trip, 25 MPG, $3.50/gal β†’ $70
Use Calculator β†’

Fuel Efficiency

Calculate your vehicle's fuel efficiency in MPG or KPL.

Key Features:
  • MPG = Miles Driven / Gallons Used KPL = Kilometers...
  • Perfect for: Fuel economy tracking, Vehicle comparison
  • Instant accurate results
Example: 300 miles on 12 gallons β†’ 25 MPG
Use Calculator β†’

Lease vs Buy

Compare the financial benefits of leasing versus buying a vehicle.

Key Features:
  • Total Cost = Down Payment + (Monthly Payment Γ— Term) + Fees
  • Perfect for: Car shopping, Financial planning
  • Instant accurate results
Example: $30,000 car: Buy $450/month vs Lease $350/month β†’ Analysis shows best option
Use Calculator β†’

Tire Size

Calculate tire dimensions and specifications from tire size codes.

Key Features:
  • Sidewall Height = Width Γ— Aspect Ratio / 100
  • Perfect for: Tire shopping, Vehicle modification
  • Instant accurate results
Example: 225/60R16 β†’ Width: 225mm, Sidewall: 135mm, Wheel: 16 inches
Use Calculator β†’

Environment

3 Calculators

Specialized calculators for environment calculations and planning.

Carbon Footprint

Calculate your carbon footprint from transportation, energy use, and lifestyle choices.

Key Features:
  • CO2 = Ξ£(Activity Γ— Emission Factor) for all activities
  • Perfect for: Environmental awareness, Sustainability planning
  • Instant accurate results
Example: 10,000 miles driving + 2 flights + home energy β†’ 12 tons CO2/year
Use Calculator β†’

Recycling Impact

Calculate environmental impact and CO2 savings from recycling different materials.

Key Features:
  • CO2 Saved = Ξ£(Material Weight Γ— CO2 Factor per material)
  • Perfect for: Environmental tracking, Sustainability goals
  • Instant accurate results
Example: 10kg paper + 5kg plastic monthly β†’ 45kg CO2 saved per year
Use Calculator β†’

Tree Offset

Calculate how many trees needed to offset your carbon emissions.

Key Features:
  • Trees Needed = CO2 Emissions / Average CO2 Absorption per Tree
  • Perfect for: Carbon offsetting, Reforestation planning
  • Instant accurate results
Example: 15 tons CO2 annually β†’ Need to plant ~750 trees
Use Calculator β†’

Finance

10 Calculators

Financial calculators for loans, investments, interest, and money management. Great for budgeting, planning, and financial decision-making.

Compound Interest

Calculate compound interest where interest earns interest over time, showing the power of compounding.

Key Features:
  • Shows the power of compounding over time
  • Supports multiple compounding frequencies
  • Displays both final amount and interest earned
Example: $5,000 at 6% compounded monthly for 10 years β†’ $9,110.59 (total gain: $4,110.59)
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Currency Converter

Convert amounts between different currencies using current exchange rates.

Key Features:
  • Converted Amount = (Amount / Source Rate) Γ— Target Rate
  • Perfect for: International travel, Online shopping
  • Instant accurate results
Example: $100 USD to EUR (rate 0.85) β†’ €85
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Discount Calculator

Calculate discounted prices and savings amount.

Key Features:
  • Final Price = Original Price Γ— (1 -...
  • Perfect for: Shopping, Sales calculations
  • Instant accurate results
Example: $100 item with 25% discount β†’ $75 final price, $25 saved
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Investment Return

Calculate the future value of your investments based on initial amount and growth rate.

Key Features:
  • Future Value = Initial Investment Γ— (1 + Annual Rate)^Years
  • Perfect for: Investment planning, Portfolio analysis
  • Instant accurate results
Example: $10,000 invested at 8% annual return for 20 years β†’ $46,610 (gain: $36,610)
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Loan Payment

Calculate monthly payments for loans including mortgages, car loans, and personal loans.

Key Features:
  • Standard banking amortization formula
  • Works for any loan type and term
  • Precise monthly payment calculation
Example: $20,000 loan at 6% for 5 years β†’ $386.66/month
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Mortgage Calculator

Calculate monthly mortgage payments for home loans including principal and interest.

Key Features:
  • Standard mortgage industry calculations
  • Accounts for down payment automatically
  • Works with any loan term and interest rate
Example: $400,000 home, $80,000 down, 5% rate, 30 years β†’ $1,718/month
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Retirement Savings

Calculate how much you need to save monthly to reach your retirement goals.

Key Features:
  • Future Value = Monthly Payment Γ— [((1 + r)^n - 1) / r]...
  • Perfect for: Retirement planning, Financial goal setting
  • Instant accurate results
Example: Age 25, retire at 65, save $500/month at 7% return β†’ $1.37 million at retirement
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Savings Goal

Calculate how much you need to save monthly to reach a specific financial goal.

Key Features:
  • Monthly Savings = Goal Amount Γ— r / [(1 + r)^n - 1]...
  • Perfect for: Emergency fund, Vacation planning
  • Instant accurate results
Example: Save $20,000 in 3 years at 4% interest β†’ $509/month needed
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Simple Interest

Calculate simple interest on loans, investments, or savings accounts.

Key Features:
  • Standard banking industry formula
  • Shows both interest earned and total amount
  • Supports any currency and time period
Example: $1,000 at 5% for 2 years β†’ Interest: $100, Total: $1,100
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Tip Calculator

Calculate tip amount and total bill including tip.

Key Features:
  • Tip = Bill Amount Γ— (Tip % / 100) Total = Bill Amount + Tip
  • Perfect for: Restaurant dining, Service tipping
  • Instant accurate results
Example: $50 bill with 18% tip β†’ $9 tip, $59 total
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Home

8 Calculators

Home improvement and DIY calculators for paint, flooring, materials, and project planning. Save time and money on your home projects.

Concrete Calculator

Calculate how much concrete you need for your construction project.

Key Features:
  • Volume = Length Γ— Width Γ— Thickness, add 10% waste factor
  • Perfect for: Foundation work, Driveways
  • Instant accurate results
Example: 10Γ—12 ft slab, 4 inches thick β†’ 1.48 cubic yards needed
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Electricity Cost

Calculate electricity costs based on power consumption and utility rates.

Key Features:
  • Cost = (Power in kW Γ— Hours Γ— Rate per kWh) Γ— Days
  • Perfect for: Energy budgeting, Appliance comparison
  • Instant accurate results
Example: 1500W heater, 8 hrs/day, $0.12/kWh β†’ $1.44/day, $43.20/month
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Fence Calculator

Calculate fencing materials needed for property boundaries and enclosures.

Key Features:
  • Materials = Perimeter / Post Spacing + Gates + Hardware
  • Perfect for: Property fencing, Garden enclosures
  • Instant accurate results
Example: 100ft perimeter, 6ft height, 8ft spacing β†’ 13 posts, 100ft fencing
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Flooring Calculator

Calculate flooring materials needed for your space.

Key Features:
  • Total Needed = Room Area Γ— (1 + Waste Factor)
  • Perfect for: Home renovation, Flooring installation
  • Instant accurate results
Example: 12Γ—15 room with 10% waste β†’ 198 sq ft
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Paint Needed

Calculate how much paint you need for your painting project.

Key Features:
  • Paint Needed = (Total Wall Area - Openings) / Coverage per Gallon
  • Perfect for: Home renovation, Interior painting
  • Instant accurate results
Example: 12Γ—10 room with 8ft ceiling β†’ ~1.5 gallons
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Roofing Calculator

Calculate roofing materials needed including shingles, underlayment, and accessories.

Key Features:
  • Area = Length Γ— Width Γ— Pitch Factor, Materials = Area Γ—...
  • Perfect for: Roof replacement, New construction
  • Instant accurate results
Example: 30Γ—40 ft roof, 6/12 pitch β†’ 1,342 sq ft area, 14 squares of shingles
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Solar Panels

Calculate solar panel requirements and energy production for your home.

Key Features:
  • System Size = Monthly Usage Γ— 12 / (Sun Hours Γ— 365 Γ—...
  • Perfect for: Solar installation, Energy independence
  • Instant accurate results
Example: 1000 kWh/month, 5 sun hours β†’ 20kW system, ~67 panels
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Tile Needed

Calculate how many tiles you need for flooring or wall projects.

Key Features:
  • Tiles = (Room Area / Tile Area) Γ— (1 + Waste Factor)
  • Perfect for: Bathroom renovation, Kitchen backsplash
  • Instant accurate results
Example: 12Γ—10 room with 12Γ—12 inch tiles + 10% waste β†’ 110 tiles
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Cooking

3 Calculators

Specialized calculators for cooking calculations and planning.

Cooking Time

Adjust cooking times and temperatures for different portion sizes and oven types.

Key Features:
  • New Time = Original Time Γ— (New Size / Original Size)^0.67
  • Perfect for: Recipe scaling, Meal planning
  • Instant accurate results
Example: Recipe for 4 people, 30 min β†’ Recipe for 8 people, ~38 min
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Oven Temperature

Convert oven temperatures between Celsius, Fahrenheit, and gas mark settings.

Key Features:
  • Β°F = (Β°C Γ— 9/5) + 32, Gas Mark approximations included
  • Perfect for: International recipes, Oven calibration
  • Instant accurate results
Example: 180Β°C = 356Β°F = Gas Mark 4
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Recipe Scaler

Scale recipe ingredients up or down for different serving sizes.

Key Features:
  • New Amount = Original Amount Γ— (New Servings / Original Servings)
  • Perfect for: Meal planning, Party cooking
  • Instant accurate results
Example: Recipe for 4 β†’ Recipe for 10: 2 cups flour becomes 5 cups flour
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Statistics

6 Calculators

Specialized calculators for statistics calculations and planning.

Correlation Coefficient

Calculate correlation coefficient to measure the strength of relationship between two datasets.

Key Features:
  • r = Ξ£[(xi - xΜ„)(yi - Θ³)] / √[Ξ£(xi - xΜ„)Β²Ξ£(yi - Θ³)Β²]
  • Perfect for: Data analysis, Research studies
  • Instant accurate results
Example: Strong positive correlation: r = 0.85
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Mean Calculator

Calculate the arithmetic mean (average) of a set of numbers.

Key Features:
  • Mean = Sum of all values / Number of values
  • Perfect for: Data analysis, Statistics
  • Instant accurate results
Example: Numbers: 2, 4, 6, 8, 10 β†’ Mean: 6
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Median Calculator

Find the median (middle value) of a dataset.

Key Features:
  • Median = Middle value when numbers are arranged in order
  • Perfect for: Statistical analysis, Data interpretation
  • Instant accurate results
Example: Numbers: 1, 3, 5, 7, 9 β†’ Median: 5
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Mode Calculator

Find the mode (most frequently occurring value) in a dataset.

Key Features:
  • Mode = value(s) that appear most frequently in the dataset
  • Perfect for: Statistical analysis, Data interpretation
  • Instant accurate results
Example: Data: 1,2,2,3,3,3,4 β†’ Mode: 3 (appears 3 times)
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Standard Deviation

Calculate standard deviation to measure data spread and variability.

Key Features:
  • Οƒ = √[Ξ£(x - ΞΌ)Β² / N] for population
  • Perfect for: Data analysis, Quality control
  • Instant accurate results
Example: Data: 2, 4, 6, 8, 10 β†’ Standard Deviation: 2.83
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Variance Calculator

Calculate variance to measure how spread out data points are from the mean.

Key Features:
  • Variance = Ξ£(x - mean)Β² / N
  • Perfect for: Statistical analysis, Data science
  • Instant accurate results
Example: Data: 1, 3, 5, 7, 9 β†’ Variance: 8
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