Arithmetic and Basic Calculations

Calculate n! for non-negative integers from 0 to 170. See the exact factorial value, digit count, and multiplication steps.

Use a free basic calculator for everyday arithmetic: add, subtract, multiply, divide, percentages, sign changes, copyable results, keyboard input, and local history.

Evaluate scientific expressions with trigonometry, logarithms, powers, roots, factorials, constants, memory, history, and DEG/RAD angle modes.

Raise a base to a power, including negative exponents and exact fractional exponents such as 1/2 and 1/3. Includes scientific notation and reciprocal output.

Calculate square roots, cube roots, and nth roots. Get decimal values, exact integer detection, simplified square-root form, and real-number validation.

Find the absolute value of a number or the distance between two numbers on a number line. Includes sign, opposite number, and decimal input support.

Calculate a mod b and compare JavaScript-style remainder with Python-style modulo for positive, negative, integer, and decimal inputs.

Round numbers to decimal places, whole numbers, or a nearest multiple. Compare half-away, half-even, ceiling, floor, and truncation results.

Calculate with very large integers using arbitrary precision. Add, subtract, multiply, divide, find remainders, powers, GCD, LCM, and factorials.

Count significant figures and round a number to a chosen number of sig figs. Supports decimal notation, comma grouping, and E notation.

Convert standard decimal numbers to scientific notation, E notation, and engineering notation, or convert a mantissa and exponent back to decimal form.

Calculate mean, median, mode, range, sum, count, variance, standard deviation, geometric mean, and harmonic mean for a data set.

Simplify ratios, convert ratio parts to percentages, compare decimal form, and split a total by a two-part or multi-part ratio.

Solve a missing value in A:B = C:D or formula. Shows the completed proportion, scale factor, and check.

Divide a total amount into two to ten ratio parts. See each share, percent of the total, one-part value, calculation steps, and rounding difference.

Convert numbers to Roman numerals and Roman numerals back to numbers. Supports standard values from 1 to 3999 with validation and symbol breakdown.