Math Tools & Calculators

calculate Calculator Free online calculator with keyboard support: four operations, percentages, parentheses and operation history. Calculatechevron_right percent Percentage Calculator Calculate X% of a number, what percent one number is of another, and percentage increase or decrease. Calculatechevron_right calculate GCD & LCM Calculator Calculate the greatest common divisor and least common multiple of two or more numbers with steps shown. Calculatechevron_right functions Combination & Permutation Calculator Calculate C(n,r) combinations, P(n,r) permutations and n! factorial with exact results. Calculatechevron_right square_foot Area Calculator Calculate the area of a square, rectangle, triangle, circle, trapezoid or parallelogram. Calculatechevron_right monitoring Standard Deviation Calculator Calculate mean, variance and standard deviation (population and sample) of a data set instantly. Calculatechevron_right view_in_ar Volume Calculator Calculate the volume of a cube, box, cylinder, sphere or cone. Calculatechevron_right crop_square Perimeter Calculator Calculate the perimeter of a square, rectangle, triangle or the circumference of a circle. Calculatechevron_right superscript Exponent & Root Calculator Calculate powers (aᵇ) and roots (√, ∛, any n-th root) with exact big-integer results for whole-number powers. Calculatechevron_right numbers Prime Factorization Calculator Break any number into its prime factors (e.g. 360 = 2³ × 3² × 5) and check whether a number is prime. Calculatechevron_right balance Ratio Calculator Simplify a ratio, or solve the proportion a:b = c:x for the missing value — recipes, scale models, mixing. Calculatechevron_right sync Modular Arithmetic Calculator Compute a mod n, modular addition, multiplication and power (aᵇ mod n) — clock arithmetic made instant. Calculatechevron_right architecture Golden Ratio Calculator Split any length by φ = 1.618 — larger and smaller golden values, segment division and a visual proportion bar. Calculatechevron_right account_balance Roman Numeral Converter Convert numbers to Roman numerals and back (1-3999) — instant, both directions, with the subtraction rules applied correctly. Convertchevron_right grid_view Matrix Calculator Add, subtract, multiply, transpose matrices up to 5×5, or find the determinant of a square matrix — instant results as you type. Calculatechevron_right timeline Fibonacci Sequence Calculator Generate the Fibonacci sequence up to any term, or jump straight to a specific term — exact values using arbitrary-precision arithmetic. Calculatechevron_right numbers Prime Number List & Checker List every prime number in a range (Sieve of Eratosthenes), or check whether a single number is prime — instant results. Checkchevron_right query_stats Sample Size Calculator Find how many survey responses or test subjects you need for a given confidence level and margin of error — with optional finite population correction. Calculatechevron_right sort Number Sorter Paste a list of numbers (any separator) and sort them ascending or descending, with optional duplicate removal — copy or download the result. Runchevron_right casino Dice Roller Roll any number of dice with any number of sides — cryptographically random, with the total and a roll history. Runchevron_right