Math & Statistics Calculators
Solve everyday and classroom math quickly. Most of these calculators show the steps behind the answer, so you can learn the method as well as get the result.
18 free calculators · no sign-up · results stay in your browser
- Percentage Calculator Popular Percent of a number, percent change, difference and reverse percentages — with steps.
- Scientific Calculator Popular Trig, logs, powers, roots and factorials, with keyboard support and a history of past results.
- Fraction Calculator Popular Add, subtract, multiply, divide and simplify fractions and mixed numbers, with steps.
- Standard Deviation Calculator Popular Sample or population SD, variance, mean and standard error, with a full table of deviations.
- Area Calculator Popular Area of 12 shapes in square feet, m², acres or hectares, with formulas and steps.
- Average Calculator Mean, median, mode, range and weighted average for any list of numbers, with steps.
- Volume Calculator Volume of 10 shapes and tanks in litres, gallons, ft³ and m³, with formulas and steps.
- Z-Score Calculator Z-scores, percentiles and left, right or two-tailed normal probabilities, with steps.
- Probability Calculator Both, either or neither event, at least one success in n tries, and exact binomial odds.
- Random Number Generator Fair random numbers in any range, with or without repeats, as whole numbers or decimals.
- Square Root Calculator Square, cube and nth roots with simplified radical form and prime-factor steps.
- Exponent Calculator Powers with negative, fractional and decimal exponents, exact big results and solve for x.
- Percent Error Calculator Percent, absolute and relative error between a measured and an accepted value, with steps.
- Ratio Calculator Simplify ratios, solve proportions and split an amount in a ratio, with steps.
- GCF and LCM Calculator GCF (HCF) and LCM of up to 10 numbers with prime factors and Euclid's algorithm.
- Quadratic Formula Calculator Roots of ax² + bx + c = 0 with discriminant, vertex, factored form and steps.
- Pythagorean Theorem Calculator Find the hypotenuse or a missing leg, plus area, perimeter and angles, with steps.
- Slope Calculator Slope from two points or rise and run, with angle, grade, distance and line equations.
About these calculators
From quick percentages to statistics homework, these math calculators give the answer and, where it helps, the step-by-step working. The percentage calculator covers six common question types, including percent of a number, percentage change and reverse percentages. The fraction calculator adds, subtracts, multiplies and divides fractions and mixed numbers and simplifies the result.
For statistics, the standard deviation, mean, median and mode, z-score and probability calculators accept your own data. For algebra and geometry, try the quadratic formula, slope, Pythagorean theorem, area and volume calculators.
The scientific calculator handles trigonometry in degrees or radians, logarithms, powers, roots and factorials from the keyboard or on screen. All calculations run in your browser, so nothing you type is sent anywhere.
Each calculator states its formula next to the answer. The quadratic formula is x = (−b ± √(b² − 4ac)) ÷ 2a, the sample standard deviation divides by n − 1 rather than n, and percentage change always divides by the original value. When a result is a fraction or a root, you get an exact form as well as a decimal (for example √72 = 6√2 ≈ 8.485), which is what most teachers ask for.