🔢 Math Tools

Calculators, fractions, number bases · 14 tools

🧮CalculatorFree online calculator for addition, subtraction, multiplication, division and percentages. Correct order of operations, keyboard support and a saved calculation history.📊Scientific CalculatorFree online scientific calculator with sin, cos, tan, inverse trig, log, ln, square roots, powers, factorials, π and e. Degrees or radians, live preview and history.½Fraction CalculatorFree fraction calculator for fractions and mixed numbers. Get the answer in simplest form, as a mixed number and as a decimal, with step-by-step working.📏Average CalculatorPaste a list of numbers to get the mean, median, mode, min, max, range, variance and standard deviation (population and sample). Weighted average included.🔗GCD and LCM CalculatorFind the greatest common divisor (GCF/HCF) and least common multiple of two or more numbers, with prime factorization steps and the list of common factors.🧩Prime Factorization CalculatorFind the prime factorization of any number up to 2⁵³−1, with exponents, the list of all factors, the number and sum of divisors, and a prime check.💾Number Base ConverterConvert between binary, octal, decimal and hexadecimal instantly, or any base from 2 to 36. Handles huge numbers exactly and shows two’s complement for negatives.ⅫRoman Numeral ConverterConvert numbers to Roman numerals (I, IV, IX, MMXXVI…) and Roman numerals to numbers, with a place-by-place breakdown and error hints.⚖️Ratio CalculatorSolve a : b = c : x proportions, split an amount in a ratio such as 2:3:5, and simplify ratios with decimals or fractions to whole numbers. Free, with working shown.🎯Rounding CalculatorRound numbers to any decimal place or to the nearest 10, 100 or 1,000. Round half up, round up or round down (truncate) with exact decimal math.📝Final Grade CalculatorFind the score you need on your final exam to get the grade you want. Enter your current grade, the final's weight and your target grade, plus a letter-grade table.🎰Permutation & Combination CalculatorCalculate permutations (nPr), combinations (nCr), permutations and combinations with repetition, and factorials with step-by-step working. Exact results for very large numbers.📐Area & Volume CalculatorFree geometry calculator for area, perimeter, volume and surface area of 18 shapes: triangle (Heron’s formula), right triangle (Pythagorean theorem), circle, trapezoid, cylinder, cone, sphere and more — with step-by-step formulas.💯Test Score CalculatorEnter the number of questions and how many you got right (or points earned) to get your percentage, letter grade and score, plus a full grading chart for every number correct.