How to use this calculator
Choose the quantity you want to find. In percentage-of mode A is the percentage and B is the whole; in share mode A is the part and B is the whole; in whole mode A is the part and B is the percentage.
- Enter what would you like to calculate?, percentage or part (a), number or whole (b) and review the remaining options.
- Select Calculate or change a value to update the result. Read the result label and units before copying.
- Use Reset to restore the worked starting values.
Formula and method
A zero whole cannot define a percentage share.
Worked example
20% of 150 = 30.
Questions about percentage calculator
What is 20% of 45?
20% of 45 is 9: 20 ÷ 100 × 45 = 9. Select the percentage-of operation, enter 20 as the percentage and 45 as the number.
How do I calculate 1% of a number?
Divide the number by 100. For example, 1% of 450 is 450 ÷ 100 = 4.5. To find 2%, double that 1% amount.
What is 2% of ₹100?
2% of ₹100 is ₹2: 2 ÷ 100 × ₹100 = ₹2. The same arithmetic applies to any currency; no currency conversion is needed.
What is 15% of ₹200?
15% of ₹200 is ₹30: 15 ÷ 100 × ₹200 = ₹30. You can also add 10% (₹20) and 5% (₹10).
How do I calculate a percentage manually?
To find p% of a number n, use p ÷ 100 × n. For example, 12% of 250 is 0.12 × 250 = 30. Percent means “per hundred,” so 12% and 0.12 represent the same proportion.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100: percentage = part ÷ whole × 100. For 30 out of 150, the result is 20%. Select A as a percentage of B in this tool. The whole cannot be zero.
Choose the tool for your question
- Percentage Change: Compare a new value with an original value.
What assumptions should I check?
A zero whole cannot define a percentage share.
Are my inputs saved?
Calculations run in your browser. We store only tool IDs for favorites and recent tools. A calculation link contains your inputs only when you explicitly choose to copy one.