Basic Math Calculators

Basic Calculator

A simple, fast online calculator for addition, subtraction, multiplication, division and percentages — with full keyboard support.

Order of operations: ( ) → × ÷ → + −

Also called simple calculator · online calculator

Scientific Calculator

Free online scientific calculator with trigonometry, logarithms, powers, roots, factorials, constants and degree/radian modes.

Functions: sin cos tan asin acos atan sin…

Also called online scientific calculator · trig calculator

Percentage Calculator

Calculate percentages three ways: X% of Y, X is what percent of Y, and X is Y% of what number — with the formula and steps.

Part = Percent ÷ 100 × Whole

Also called percent calculator · what percent of

Fraction Calculator

Add, subtract, multiply and divide fractions and mixed numbers. Get the simplified answer, mixed number and exact decimal.

a/b + c/d = (ad + bc)/bd

Also called fractions calculator · mixed fraction calculator

Ratio Calculator

Simplify a ratio, scale it, or divide a total amount in a given ratio such as 2:3:5 — with each share shown.

Share = Total × (part ÷ sum of parts)

Also called ratio solver · divide in ratio

Proportion Calculator

Solve proportions A/B = C/D for the missing value using cross-multiplication, with steps.

A/B = C/D ⇒ D = B × C ÷ A

Also called cross multiplication calculator · solve for x proportion

Average Calculator

Find the average (arithmetic mean) of a list of numbers, plus the sum, count, minimum, maximum and range.

Average = (x₁ + x₂ + … + xₙ) ÷ n

Also called average of numbers · find the average

Mean Calculator

Calculate the arithmetic, geometric, harmonic and quadratic (RMS) mean of a data set in one place.

AM = Σx / n

Also called arithmetic mean · geometric mean calculator

Median Calculator

Find the median (middle value) of any list of numbers, with the sorted data and step-by-step explanation.

Odd n: median = x₍₍ₙ₊₁₎/₂₎

Also called find the median · middle number

Mode Calculator

Find the mode — the most frequent value — of a data set, including multimodal data, with a full frequency table.

Mode = the value with the highest frequen…

Also called most frequent number · find the mode

LCM Calculator

Find the least common multiple (LCM) of two or more whole numbers, with prime factorisations and steps.

LCM(a, b) = |a × b| ÷ GCD(a, b)

Also called least common multiple · lowest common multiple

GCD / HCF Calculator

Find the greatest common divisor (GCD), also called the highest common factor (HCF) or GCF, with Euclidean algorithm steps.

Euclid: GCD(a, b) = GCD(b, a mod b), GCD(…

Also called hcf calculator · greatest common divisor

Prime Number Checker

Check whether a number is prime instantly (up to 24 digits), see its smallest factor and the nearest primes.

A prime has exactly two divisors: 1 and i…

Also called is it prime · prime checker

Random Number Generator

Generate random numbers in any range — integers or decimals, with or without repeats — using a cryptographically secure source.

Also called rng · random number picker

Exponent Calculator

Calculate powers and exponents (xⁿ), including negative and fractional exponents, with exact results for large whole-number powers.

xⁿ = x × x × … × x (n times)

Also called power calculator · x to the power of y

Square Root Calculator

Find the square root of any number, check for perfect squares and simplify radicals like √72 = 6√2.

√x = y where y² = x

Also called sqrt calculator · root calculator

Cube Root Calculator

Calculate the cube root of positive or negative numbers, identify perfect cubes and simplify cube-root radicals.

∛x = y where y³ = x

Also called cbrt calculator · third root

Factorial Calculator

Compute n! exactly for any whole number up to 5,000, with the number of digits and trailing zeros.

n! = n × (n − 1) × … × 2 × 1, and 0! = 1

Also called n factorial · factorial of a number

Log Calculator

Calculate logarithms in base 10, base e (natural log, ln), base 2 or any custom base, with the change-of-base formula.

log_b(x) = ln(x) / ln(b)

Also called logarithm calculator · ln calculator

Absolute Value Calculator

Find the absolute value |x| of any number or expression — its distance from zero on the number line.

|x| = x if x ≥ 0, −x if x < 0

Also called abs value · modulus of a number

Rounding Calculator

Round numbers to decimal places, significant figures, or the nearest 10, 100 or 1,000 — half up, half even, up or down.

Round half up: look at the next digit — 5…

Also called round numbers · round to nearest

Remainder Calculator

Divide two numbers and get the quotient and remainder (long division result), e.g. 17 ÷ 5 = 3 R 2.

Dividend = Divisor × Quotient + Remainder

Also called division with remainder · long division calculator

Modulo Calculator

Calculate a mod n for positive and negative numbers using the mathematical (always non-negative) definition.

a mod n = a − n × ⌊a / n⌋

Also called mod calculator · modulus calculator