Math
Scientific calculator, grade average, fractions, quadratic equations, area and perimeter, GCD/LCM, number bases and random pickers.
12 tools
Fraction calculatorEnter two fractions or mixed numbers and pick an operation. You get the simplified result, a mixed number, the decimal expansion and a step-by-step explanation.Grade average calculatorType your grades, e.g. “5 4+ 3 6” or with weights “5:3 4:2”, and get the simple and weighted average instantly. Weights can be test weights, credit hours or ECTS credits.Area and perimeter calculatorPick a shape or solid and enter its dimensions - the calculator shows area, perimeter, diagonal, volume and surface area, the formula with your numbers and a labelled diagram.Dice rollerRoll 1-10 dice of one type or any combination in RPG notation (e.g. 2d6+1d4−1). You get every die’s value, the total with modifier, the possible range and the average.GCD and LCM calculatorEnter two or more integers - the calculator finds the greatest common divisor (GCD) and least common multiple (LCM), factorises each number into primes and shows the steps of the Euclidean algorithm.Number base converterType a number and pick its base - the converter shows it in binary, octal, decimal, hexadecimal and any other base (2-36), including negative and fractional numbers, with two’s complement and the conversion steps.Proportion calculator (rule of three)Enter three known values and get the fourth instantly. Choose a direct proportion (more means more) or an inverse one (more means less) and follow the step-by-step working, ideal for homework, recipes and everyday maths.Quadratic equation solverEnter a, b and c - the solver calculates the discriminant and exact roots (as fractions, surds or complex numbers), the vertex, the vertex and factored forms, and draws the parabola.Random number generatorPick a random number from 1 to 100 or any other range, draw several unique numbers, choose a giveaway winner, shuffle a list into teams or roll dice - all with your browser’s cryptographic random generator.Roman numerals converterType an Arabic number, a Roman numeral or a date - the converter shows the correct notation, breaks it into symbols and flags malformed numerals such as IIII or VX.Scientific calculatorType a full expression such as 2^10 + sin(30) · √16 or use the buttons - the calculator respects the order of operations and supports brackets, trigonometry (DEG/RAD), logarithms, factorial, percent and the previous answer (ANS).Wheel spinnerType options (one per line), click “Spin the wheel” and watch the pointer stop on the winner. The result comes from your browser’s cryptographic random generator.
Math with explanations
The calculators do not just give an answer - most show the formula with your numbers substituted or a step-by-step solution you can copy. Use the scientific calculator, solve quadratic equations, work with fractions and proportions, compute GCD and LCM, convert number bases, calculate areas and volumes or average grades - and pick random numbers, spin a wheel or roll dice with a cryptographic random generator.