Math & Calc
Free online math tools and calculators. Scientific calculator, percentage, BMI, compound interest, fractions, matrix solver, tip calculator, and more.
17 tools
Statistics Calculator
Calculate mean, median, mode, standard deviation, variance, quartiles, IQR, and outliers from any list of numbers. Free, instant, with a histogram.
Scientific Calculator
Free online scientific calculator with sin, cos, tan, log, ln, sqrt, power, and more. No download required.
Percentage Calculator
Calculate percentages instantly — find X% of Y, percentage change, what percent X is of Y, and reverse percentage. Free online tool.
BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units. See your BMI category and healthy weight range. Free online BMI calculator.
Compound Interest
Calculate compound interest with year-by-year breakdown. Enter principal, rate, compounding frequency, and years. Free online tool.
Matrix Calculator
Add, subtract, multiply matrices, find transpose and determinant. Supports 2×2 and 3×3 matrices. Free online matrix calculator.
Fraction Calculator
Add, subtract, multiply, and divide fractions online. Results shown as simplified fractions and mixed numbers. Free, instant, no signup.
Random Number Generator
Generate random integers or decimals within any range. Supports multiple numbers, unique values, and decimal output. Free online random number generator.
Quadratic Solver
Solve quadratic equations ax²+bx+c=0 with step-by-step working. Handles real and complex roots. Free online quadratic solver.
Average Calculator
Calculate mean, median, mode, range, variance, standard deviation and more from a list of numbers. Free online statistics calculator.
Tip Calculator
Calculate tip amount, total bill, and per-person split instantly. Choose from preset tip percentages or enter custom. Free online tip calculator.
Discount Calculator
Calculate sale price, savings, and original price from any discount percentage. Forward and reverse discount calculator. Free online tool.
Roman Numeral Converter
Convert integers to Roman numerals and Roman numerals to integers. Two-way converter supporting 1–3999. Free online tool.
Triangle Calculator
Solve triangles by SSS or SAS. Calculate all angles, area, perimeter, and triangle type using the Law of Cosines. Free online tool.
Permutation & Combination
Calculate nPr (permutations) and nCr (combinations) with step-by-step formulas. Free online P&C calculator supporting n up to 20.
Calorie Calculator
Calculate your BMR and TDEE with the Mifflin-St Jeor formula, plus daily calorie targets for losing, maintaining or gaining weight and a macro breakdown. Free.
Body Fat Calculator
Estimate body fat percentage with the US Navy tape measure method, plus a BMI-based cross-check, fat mass and lean mass. Metric and imperial. Free.