Percentage Calculator
Solve every common percentage question — "what is X% of Y", "X is what percent of Y", and percentage change.
Calculators and explainers tagged under Math.
Solve every common percentage question — "what is X% of Y", "X is what percent of Y", and percentage change.
Convert any percentage into its decimal equivalent and an exact fraction (n / 10000) so you can simplify it by hand.
Volume, lateral surface area, and total surface area of a right circular cylinder from radius and height.
Generate one or more random integers in a chosen range, with optional uniqueness and optional sorting.
Add, subtract, multiply, and divide fractions — with automatic simplification.
Estimate the entropy of a password in bits and the approximate time to brute-force it at a chosen guess rate.
Find the slope of the line through two points, plus the line equation in slope-intercept form.
Calculate the new value after applying a percentage increase and see the absolute change.
Find the greatest common factor (also called GCD) of any list of whole numbers using the Euclidean algorithm.
Find the least common multiple of two or more whole numbers, with the full prime-factor breakdown.
Convert a fraction (numerator / denominator) into its decimal value and a percentage.
Compute the area, circumference, and diameter of a circle from any single input.
Volume and surface area of a sphere from radius or diameter.
Compute range, max height, and flight time for a projectile launched at an angle.
Solve a triangle from any valid combination of sides and angles — SSS, SAS, ASA, AAS, or SSA.
Convert numbers between standard decimal form and normalized scientific notation (a × 10ⁿ with 1 ≤ |a| < 10).
Population and sample variance of a dataset, with the standard deviation shown alongside.
Solve for a missing term in a proportion, simplify ratios, or scale one ratio up or down.
Every "X% of Y" problem, every "what percent of", every percent-change question — written out the way you'd actually say them.