Math & numbers·Basic
Percentage Calculator
Find percent of a number, what percent one number is of another, or percent change. Fully client-side — no account, uploads, or remote storage.
Added Apr 18, 2026
Quick examples
Input
Result
Enter a value for what do you want to calculate? to see your result.
How it works
Calculates percentages in three modes: finding X% of a value, finding what percentage one number is of another, and calculating the percentage change between two values.
Step by step
- 01Choose your calculation mode from the dropdown.
- 02For 'X% of Y': multiply Y by X/100.
- 03For 'X is what % of Y': divide X by Y and multiply by 100.
- 04For '% change': divide (new − old) by old and multiply by 100.
Examples
What is 20% of 250?
20% of 250 = 250 × 20/100 = 50.
Inputs
- What do you want to calculate?:
- of
- Percentage (%):
- 20
- Of value:
- 250
Result
- Result:
- 50
50 is what % of 200?
50 ÷ 200 × 100 = 25%.
Inputs
- What do you want to calculate?:
- what
- Part:
- 50
- Whole:
- 200
Result
- Result:
- 25%
% change from 200 to 250
(250 − 200) ÷ 200 × 100 = +25%.
Inputs
- What do you want to calculate?:
- change
- From:
- 200
- To:
- 250
Result
- Result:
- +25.00%
Frequently asked questions
How do I calculate 20% of 250?
Multiply 250 by 0.20 (which is 20/100). 250 × 0.20 = 50.
How do I find the percentage change?
Divide (new value − old value) by the old value, then multiply by 100. A positive result is an increase; negative is a decrease.