Free maths calculators
Every calculator writes out its steps, so you can check your own working. Everything runs in your browser, and nothing you type is sent anywhere.
Fraction calculator
Free fraction calculator: add, subtract, multiply and divide fractions and mixed numbers, with every step shown, from the common denominator to simplifying.
Quadratic equation calculator
Free quadratic equation calculator: enter a, b and c to solve ax² + bx + c = 0 with the quadratic formula, with every step shown, from the discriminant to simplifying the surd and factorising.
Standard deviation calculator
Free standard deviation calculator: enter a set of data to get the mean, variance and standard deviation, with a table showing how far each value is from the mean, worked the DSE way.