Math & Everyday Calculators

The math you actually use day to day: percentages, discounts while shopping, splitting a restaurant bill, and counting days between dates. Each calculator gives an instant answer plus the manual method, so you can double-check it or do it in your head next time.

Percentage CalculatorX% of Y, X as a % of Y, and % change — all in one. Discount CalculatorFinal price after a discount — and what you actually save. Tip CalculatorTip amount, total and per-person split for any bill. Date Difference CalculatorExact days, weeks and months between any two dates. Percentage Change CalculatorPercentage increase or decrease between two numbers. Fraction CalculatorAdd, subtract, multiply or divide fractions — simplified. GCD & LCM CalculatorGCD (HCF) and LCM of two or more numbers at once. Square Root CalculatorSquare root and cube root of any number. Exponent CalculatorAny base to any power — negatives and fractions included. Quadratic Equation SolverSolve ax² + bx + c = 0 — roots, discriminant, vertex. Mean, Median & Mode CalculatorAverage, median, mode and range of any number list. Standard Deviation CalculatorSample & population SD, variance and mean from a list. Probability CalculatorProbability, percentage and odds from outcomes. Permutation & Combination CalculatornPr and nCr — arrangements and selections, computed exactly. Number Base ConverterBinary ↔ decimal ↔ hex ↔ octal in one tool.