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Math Calculators

Free math calculators for everyday problems — percentages, fractions, averages, area, volume, and more. Pick the tool you need.

What are Math Calculators?

Math calculators are tools that solve specific types of math problems — percentages, fractions, averages, geometry, and more. Unlike a basic calculator that only does arithmetic, each tool here is designed for a particular problem type and shows you the formula, steps, and result.

These calculators cover the math most people actually need: figuring out a tip percentage, splitting fractions in a recipe, calculating square footage for a room, or finding the average of a set of grades.

All Math Calculators

Percentage Calculator

Find percentages, calculate what percent one number is of another, or find the whole from a percentage. Handles all three percentage problem types.

  • 3 modes
  • X% of Y
  • Reverse %

Fraction Calculator

Add, subtract, multiply, and divide fractions. Automatically simplifies results to lowest terms and shows mixed numbers.

  • 4 operations
  • Auto-simplify
  • Mixed numbers

Percentage Change Calculator

Calculate the percentage increase or decrease between two values. Shows both the change amount and the percentage.

  • Increase & decrease
  • Old vs new
  • Change amount

Average Calculator

Calculate the mean average of any set of numbers. Enter as many values as you need and get the result instantly.

  • Unlimited values
  • Mean average
  • Sum & count

Area Calculator

Calculate the area of rectangles, circles, triangles, and other common shapes. Supports multiple unit types.

  • 6 shapes
  • Multiple units
  • Step-by-step

Volume Calculator

Calculate the volume of cubes, cylinders, spheres, cones, and other 3D shapes. Shows formulas and step-by-step solutions.

  • 7 shapes
  • 3D geometry
  • Step-by-step

Speed Distance Time Calculator

Calculate speed, distance, or time when you know two of the three. Works with mph, km/h, and other units.

  • 3 solve modes
  • mph & km/h
  • Flexible units

Random Number Generator

Generate random numbers within any range. Set your minimum and maximum, generate one or multiple random numbers.

  • Custom range
  • Multiple numbers
  • True random

Which Math Calculator Should I Use?

Finding a percentage: Use the Percentage Calculator to find X% of a number, what percent one number is of another, or the whole from a part and percentage.

Comparing two values: Use the Percentage Change Calculator to find the increase or decrease between an old and new value — useful for price changes, salary raises, or growth metrics.

Working with fractions: Use the Fraction Calculator to add, subtract, multiply, or divide fractions. Results are automatically simplified.

Finding an average: Use the Average Calculator to calculate the mean of any set of numbers — grades, prices, measurements, or anything else.

Measuring space: Use the Area Calculator for 2D shapes (floor space, walls, land) or the Volume Calculator for 3D shapes (tanks, containers, rooms).

Travel & motion: Use Speed Distance Time to calculate any of the three when you know the other two.

Common Math Formulas

Problem Formula
X% of Y Y × X ÷ 100
Percentage change ((New - Old) ÷ Old) × 100
Average (mean) Sum of values ÷ Count
Rectangle area Length × Width
Circle area π × r²
Triangle area ½ × Base × Height
Box volume Length × Width × Height
Cylinder volume π × r² × Height
Sphere volume ⅔ × π × r³
Speed Distance ÷ Time
Distance Speed × Time
Time Distance ÷ Speed

Frequently Asked Questions

What math calculators are available? +
CalculatorSwitch offers free math calculators including percentage, fraction, percentage change, average, area, volume, speed/distance/time, and random number generator. Each handles a specific type of everyday math problem.
How do I calculate a percentage? +
To find X% of a number, multiply the number by X and divide by 100. For example, 15% of 200 = 200 × 15 ÷ 100 = 30. To find what percentage one number is of another, divide the part by the whole and multiply by 100.
How do I calculate percentage change? +
Percentage change = ((New Value - Old Value) ÷ Old Value) × 100. A positive result means an increase, a negative result means a decrease. For example, a price going from $80 to $100 is a 25% increase.
What is the difference between mean, median, and mode? +
Mean is the sum of all values divided by the count. Median is the middle value when sorted. Mode is the most frequent value. Mean is affected by outliers, median is not.
How do I add and subtract fractions? +
First find a common denominator, then add or subtract the numerators. For example: 1/3 + 1/4 = 4/12 + 3/12 = 7/12. For multiplication, multiply numerators together and denominators together. For division, flip the second fraction and multiply.
How do I calculate area and volume? +
Area formulas: rectangle = length × width, circle = pi × radius squared, triangle = 1/2 × base × height. Volume formulas: box = length × width × height, cylinder = pi × radius squared × height, sphere = 4/3 × pi × radius cubed.