Percentage Calculator
Calculate percentages, find what percent one number is of another, and compute percentage change. Instant and free.
How to use
1. Choose the calculation mode from the dropdown. 2. Enter the two values. 3. The result appears instantly below.
Formula
- X% of Y = (X / 100) * Y - X is what % of Y = (X / Y) * 100 - Percentage change = ((New - Old) / Old) * 100
Examples
- What is 20% of 150? → 30
- 45 is what percent of 90? → 50%
- From 200 to 240 is what change? → +20%
Important notes
Results are rounded for display; full precision is used internally.
Frequently asked questions
Is this calculator free?
Yes, completely free with no ads and no registration.
Does it work on mobile?
Yes, it is fully responsive and works on any device.