Math
Percentage, fractions, equations, statistics
Percentage Calculator
Work out a percentage of any amount, plus the value increased or decreased by that percentage.
Rule of Three Calculator
Solve a proportion instantly: if A corresponds to B, find what C corresponds to.
Percentage Change Calculator
Calculate the percentage increase or decrease between two values.
Ratio Calculator
Simplify a ratio and get its decimal and percentage form.
Weighted Average Calculator
Calculate a weighted average (grades with coefficients, scores with weights) — add as many rows as you need.
GCD & LCM Calculator
Find the greatest common divisor (GCD) and least common multiple (LCM) of two whole numbers.
Power / Exponent Calculator
Raise a base to an exponent (bᵉ) — instantly.
Nth Root Calculator (square, cube…)
Find the square root, cube root or any nth root of a number.
Factorial Calculator (n!)
Compute the factorial of a whole number (n!), up to 170.
Modulo Calculator (remainder)
Find the remainder and quotient of a division (a mod b).
Percent Error Calculator
The percentage difference between a measured value and the true value.
Z-Score Calculator
How many standard deviations a value is from the mean.
Combinations & Permutations Calculator
Count the ways to choose or arrange r items from a set of n (nCr and nPr).
Slope Calculator
The slope, percent grade and angle of a line through two points.
Quadratic Equation Solver
Solve ax² + bx + c = 0 and get the discriminant and roots.
Distance Between Two Points
The straight-line distance between two points on a plane.
Logarithm Calculator
The logarithm of a number in any base, plus the natural log.
Arithmetic Sequence Calculator
The nth term and the sum of an arithmetic sequence.
Geometric Sequence Calculator
The nth term and the sum of a geometric sequence.
Roman Numeral Converter
Convert a number (1–3999) into Roman numerals.
Scientific Notation Converter
Express a number as a coefficient × 10 to a power.
Prime Number Checker
Check whether a number is prime and find its smallest divisor.
Fraction to Decimal Calculator
Convert a fraction into a decimal and a percentage.
Average Calculator (Mean)
Find the mean, median, sum, min and max of a list of numbers.