4 tools, all running locally in your browser. Every conversion uses exact international definitions, and each page explains the traps that generic converters miss.
Calculate percentages: X% of Y, X is what % of Y, and percentage change. Includes the percent vs percentage-po…
Percentage CalculatorCompute mean, median, mode, range and sample standard deviation from a list of numbers. Explains when the aver…
Average, Median & Standard Deviation CalculatorFind the GCD and LCM of two or more integers using Euclid's algorithm. Shows how they connect and where they a…
GCD & LCM CalculatorPerform arithmetic on fractions with automatic simplification. Shows the unsimplified result, the simplified f…
Fraction Calculator