Percentage calculator
Six handy percentage calculators on one page. Type in any row and get the answer instantly – from “what is 10% of 500” to percentage increase and reverse percentages.
- Runs in your browser – private
- Instant results
- Free forever, no sign-up
How to use the Percentage Calculator
- 1
Find the row that matches your question.
- 2
Type your two numbers.
- 3
The answer appears instantly on the right.
Percentage formulas
X is what % of Y = X ÷ Y × 100
% change = (New − Old) ÷ Old × 100
Add X% = Y × (1 + X ÷ 100) · Subtract X% = Y × (1 − X ÷ 100)
Everyday uses
- Marks percentage: 432 out of 500 is 86.4%.
- Salary hike: from ₹40,000 to ₹46,000 is a 15% increase.
- Shopping: 25% off – or use the discount calculator.
- Business: growth rates, conversion rates and margins – see the profit margin calculator.
- Tax: add 18% GST – or use the GST calculator.
Percentage increase vs percentage points
If a rate rises from 10% to 12%, that is a 2 percentage point rise but a 20% increase. Use the percentage change row to get the relative change.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. 15% of 2,000 = 0.15 × 2,000 = 300.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100. From 80 to 100 is a 25% increase.
How do I calculate marks percentage?
Divide marks obtained by total marks and multiply by 100. Use the second row: 432 is what % of 500 = 86.4%.
How do I find the original number from a percentage?
Use the last row: if 25 is 40% of a number, the number is 25 ÷ 0.40 = 62.5.
Is this percentage calculator free?
Yes, it is free with no sign-up.