🧮 Percentage Calculator
A quick three-in-one percentage tool: find X% of a number, work out what percent one number is of another, and calculate the percentage increase or decrease between two values. Everything is computed instantly in your browser.
What is % of = 30
is what % of ? = 20%
From to = +20%
🔒 Runs 100% in your browser. Your data never leaves your device.
How to use
- Pick the row that matches your question.
- Type the two numbers.
- The answer updates instantly as you type.
FAQ
How is percentage change calculated?
It is (new value − old value) ÷ absolute value of the old value, multiplied by 100. A positive result is an increase, a negative one is a decrease.
Is my data saved?
No. Every calculation runs in your browser and nothing is uploaded.
Is it free?
Yes, it is free with no sign-up required.