Percentage Calculator
Three everyday percentage calculations in one place — perfect for discounts, tips, grades and growth rates.
Free · No sign-up · Private — runs in your browser
What is X% of Y?
Answer: 30
X is what % of Y?
Answer: 25%
Percentage increase / decrease
Increase: +25%
How to use the Percentage Calculator
- Pick the question that matches yours.
- Enter the two numbers.
- The answer updates instantly.
Why use this percentage calculator?
- Percent of a number
- Percentage increase / decrease
- Instant results
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. Example: 15% of 200 = 200 × 15 ÷ 100 = 30.
How do I calculate percentage change?
(New − Old) ÷ Old × 100. A positive result is an increase, negative is a decrease.
How do I calculate a discount?
Use “% of”: the discount amount is price × discount % ÷ 100. Subtract it from the price for the sale price.