Math calculators that show the working
Every calculator here gives the answer and writes out the steps, so you can check your homework, learn the method or confirm a quick figure.
Arithmetic and Fractions
Percentage CalculatorFind a percent of a number, what percent one number is of another, or the percent change between two values.Fraction CalculatorAdd, subtract, multiply and divide fractions, then see the simplified result and mixed number.GCF and LCM CalculatorFind the greatest common factor and least common multiple of two or more whole numbers.
Algebra
Quadratic Formula CalculatorSolve ax² + bx + c = 0 and see the discriminant, both roots and every step.Linear Equation CalculatorSolve ax + b = cx + d with steps, a check, and clear answers when there is no solution or infinitely many.
Statistics
Mean, Median, Mode CalculatorGet the mean, median, mode and range of a list of numbers, with the sorted data shown.Standard Deviation CalculatorGet the sample and population standard deviation and variance of a list, with every step shown.
Geometry
Pythagorean Theorem CalculatorFind the hypotenuse or a missing leg of a right triangle from the other two sides.Slope, Distance and Midpoint CalculatorEnter two points to get the slope, distance, midpoint and equation of the line through them.
How these calculators work
Each tool uses a standard formula, names it, and applies it to your numbers one line at a time. Results are rounded only at the end, to 12 significant digits, so you do not lose accuracy partway through.
New calculators are added only when we can verify the formula and explain it clearly. Browse the list above, or read how we check our maths.