Math tools

All 3 math tools. Every result comes with the formula used and a reference table, and everything runs in your browser. ← All categories

Math

Fast, simple 4-function basic online calculator. Free addition, subtraction, multiplication, division & percentages with keyboard shortcuts.

What is X% of Y? Percentage change, increase, decrease — all in one tool.

Percentage increase or decrease between two numbers — with the formula shown.