Numbers Calculators & Tools

Our free math calculators handle everyday number problems instantly — no spreadsheet or mental gymnastics required. Calculate the exact tip on a restaurant bill and split it evenly among the table. Work out any percentage in three different ways: find what percentage one number is of another, calculate a percentage of a value, or determine percentage change. Convert between hundreds of units across length, weight, temperature, volume, area, and speed. Get a letter grade from a score, or figure out what score you need to hit a target grade. Every tool gives you instant results as you type — no submit button, no waiting.