Math calculators
Every calculation runs instantly in your browser, nothing sent anywhere.
Dedicated calculators
Each one has its own page with the formulas, worked examples and answers to common questions.
- Percentage CalculatorFind a percentage of a number, what percent one number is of another, or the percent change. Free, instant, runs in your browser.
- Fraction CalculatorAdd, subtract, multiply and divide fractions. Answers are reduced to simplest form automatically, with worked examples and a short guide below.
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 instantly. Enter a, b and c to get the real roots and the discriminant, with the formula and worked examples explained.
- Circle Area CalculatorFind the area and circumference of a circle from its radius or diameter. Free calculator with the formulas and worked examples explained.
- Ratio CalculatorSimplify any ratio to its lowest terms in one step. Enter two whole numbers and get the simplified ratio, with worked examples and a short guide.