Math calculators
Percentages, averages, geometry, and everyday arithmetic.
Percentage Calculator
Find X% of a number, or what percent one number is of another.
Percent Change Calculator — % Increase Formula
Percent increase or decrease between two values.
Average Calculator
Arithmetic mean of a comma-separated list of numbers.
Ratio Calculator
Simplify a:b and scale a ratio to a target total.
Square Root Calculator (√x)
Principal square root of a non-negative number.
Circle Area Calculator
Area and circumference from radius.
Triangle Area Calculator
Area from base and height.
Pythagorean Theorem Calculator — Find Missing Side
Find the missing side of a right triangle.
Simplify Fractions Calculator — Formula + Examples
Simplify a fraction and convert it to a decimal.
GCF & LCM Calculator
Greatest common factor and least common multiple of two integers.
Factorial Calculator
n! for non-negative integers up to 170.
Exponent Calculator
Raise a base to a power (aᵇ).
Log Calculator — Natural, Common & Any Base
log base b of x, plus natural and common logs.
Rectangle Area Calculator
Area and perimeter of a rectangle.
Cylinder Volume Formula (V = πr²h) — Free Calculator
Volume and lateral surface area of a right cylinder.
Sphere Volume Calculator
Volume and surface area of a sphere.
Median Calculator for a Number List
Median of a comma-separated list of numbers.
Proportion Calculator — Rule of Three (a/b = c/x)
Solve a/b = c/x (rule of three).
Quadratic Formula Calculator
Solve ax² + bx + c = 0 for real roots.
Standard Deviation Calculator (Sample & Population)
Sample or population standard deviation of a list.
Permutation & Combination Calculator (nPr, nCr)
nPr and nCr for choosing r items from n.
Decimal to Fraction Calculator
Convert a decimal to a simplified fraction.
Cone Volume Calculator
Volume and lateral area of a right circular cone.
Cube Volume Calculator
Volume and surface area of a cube.
Slope Calculator — m Between Two Points
Slope of a line through two points.
Percent Difference Calculator — Free Formula Tool
Percent difference relative to the average of two values.
Midpoint Calculator
Midpoint of a line segment between two points.
Distance Formula Calculator
Euclidean distance between two 2D points.
Trapezoid Area Calculator
Area of a trapezoid from two bases and height.
Circle Circumference Calculator
Circumference and diameter from radius.
Variance Calculator
Sample or population variance of a list.
Z-Score Calculator
Standard score (x − μ) / σ.
Scientific Notation Calculator
Convert a number to a × 10ⁿ form.
Percentage Error Calculator
Percent error vs an accepted (true) value.