What is a percentage calculator?
A percentage is a number out of 100. X% of Y = Y × X ÷ 100. X as a percent of Y = X ÷ Y × 100. Percentage change = (new − old) ÷ old × 100.
Features
- X% of Y
- X is what % of Y
- Percentage increase or decrease
- Add or subtract a percentage
How to use the percentage calculator
- Pick the question that matches yours.
- Type the two numbers.
- Read the answer and the formula under it.
Everyday examples
- Marks: 432 out of 500 = 432 ÷ 500 × 100 = 86.4%.
- Discount: 20% off ₹2,499 = ₹2,499 × 0.8 = ₹1,999.20.
- Salary hike: ₹40,000 to ₹46,000 = (6,000 ÷ 40,000) × 100 = 15% increase.
Note that a 20% rise followed by a 20% fall does not return to the start: 100 → 120 → 96.
Frequently asked questions
How do I calculate percentage of marks?
Divide marks obtained by total marks and multiply by 100. Use the 'X is what percent of Y' box.
Last updated 15 November 2026. Made by Criza Labs. Spotted a mistake? Tell us.
