Percentage Calculator

What is a percentage calculator?

A percentage calculator turns everyday percent questions into instant answers. It covers three common jobs: finding a share of a number, showing one number as a share of another, and measuring change between an old and a new value. Shoppers check discounts, students check marks and sellers check growth with the same simple sums.

For example, 20% of 250 is 50, so a Rs 250 shirt at 20% off costs Rs 200. If your salary rises from Rs 40,000 to Rs 44,000, that is a 10% increase. This page handles all three calculations without any signup.

How to use this percentage calculator

1. Pick the section you need: X% of Y, X is what % of Y, or increase/decrease.
2. Type the two numbers into that section's boxes.
3. Press the matching Calculate button.
4. Read the answer shown under that section.

Why use this tool

• Free with no signup; all three percent modes on one page.
• Runs fully in your browser - numbers never leave your device.
• Handles decimals and clearly flags zero-division mistakes.
• Clean results you can copy into bills or homework.

Frequently Asked Questions

How do I find X percent of Y?

Divide X by 100 and multiply by Y. For instance, 15% of 200 equals 0.15 times 200, which is 30. Type both numbers in the first section here and the answer appears at once.

How do I find what percent X is of Y?

Divide X by Y and multiply by 100. If you scored 45 out of 60, that is 45 divided by 60 times 100, or 75%. The second section on this page does it for you.

How is percent increase or decrease found?

Subtract the old value from the new value, divide by the old value and multiply by 100. A shop price moving from 800 to 600 is a 25% decrease. Use the third section for instant results.

Does this calculator need my data?

No. Every sum runs in your browser with JavaScript, so your numbers stay on your own device and nothing is uploaded.