Math made fresh and simple
Step-by-step friendly math calculators for arithmetic, algebra, geometry and statistics — with the formula shown every time.
⭐ Featured tools
🆕 New tools
📚 Guides
➗ Arithmetic
Fraction Calculator
Add, subtract, multiply or divide two fractions and get the answer in simplest form, as a mixed number and as a decimal. Free step-by-step fraction calculator.
Decimal to Fraction Calculator
Convert any decimal number into a fraction in simplest form, plus a mixed number and percentage.
Exponent Calculator
Raise any number to any power, including negative and fractional exponents, with the answer in normal and scientific notation.
Square Root Calculator
Find the square root, cube root or any nth root of a number, with the simplified radical form for square roots.
Logarithm Calculator
Calculate logarithms in base 10, base e (natural log), base 2 or any base you choose.
Rounding Calculator
Round numbers to any number of decimal places or to the nearest 10, 100 or 1,000, rounding half up, always up or always down.
Scientific Notation Calculator
Convert any number to scientific notation (a × 10ⁿ) and E notation, and see its significant figures.
Percent Error Calculator
Calculate percent error between a measured (experimental) value and the true (accepted) value, as used in science labs.
✖️ Algebra
Quadratic Equation Solver
Solve any quadratic equation ax² + bx + c = 0 with the quadratic formula, including complex roots, the discriminant and the vertex.
Ratio Calculator
Simplify a ratio to lowest terms and solve a proportion A : B = C : x for the missing value.
Slope Calculator
Find the slope between two points, the equation of the line (y = mx + b), the distance between the points and the midpoint.
GCF and LCM Calculator
Find the greatest common factor (GCF/GCD) and least common multiple (LCM) of two or more whole numbers.
Prime Number Checker
Check whether a number is prime and see its prime factorization and the nearest primes.
📐 Geometry
Pythagorean Theorem Calculator
Find the missing side of a right triangle with the Pythagorean theorem, plus its area, perimeter and angles.
Area Calculator
Calculate the area of a rectangle, square, triangle, circle, trapezoid, parallelogram or ellipse in any unit.
Volume Calculator
Calculate the volume of a cube, rectangular box, cylinder, sphere, cone or pyramid, with liters and US gallons for cm and inches.
📊 Statistics & Probability
Average Calculator (Mean, Median, Mode)
Paste a list of numbers to get the mean, median, mode, range, sum and count. Free average calculator for grades, scores and statistics homework.
Standard Deviation Calculator
Calculate the standard deviation and variance of a data set, for both a sample and a whole population, plus mean and count.
Permutation and Combination Calculator
Calculate permutations (nPr) and combinations (nCr): the number of ways to arrange or choose r items from n.
Frequently Asked Questions
Do I need to sign up or log in?
No. Every calculator works instantly without an account. A free account is only needed if you want to save results (up to 30) and see them later.
Is my data stored anywhere?
The numbers and dates you type are calculated in your browser and are not sent to us. We keep basic visit statistics (page visited, IP address, browser, time) and, if you save a result, that saved result in your account. The AI Assistant sends your question to an AI provider to answer it.
Are the results exact?
Date and age maths is exact. Money, tax and health tools are estimates based on published formulas and official tables, and are not professional advice.