Percentage Calculator
What is X% of Y, and what percent is A of B. Numbers only. Copy sits next to the result.
Percent of a number
A is what percent of B
How it works
Enter numbers
Use the left pair for X% of Y, or the right pair for A is what percent of B. Only digits, a decimal point or comma, and a leading minus are accepted.
Read the result
The value updates as you type. 15% of 200 is 30. 30 is 15% of 200.
Copy the result
Copy sits next to the result field.
What is a percentage calculator?
A percentage is a number out of 100. X% of Y scales Y by X/100. Asking what percent A is of B compares A to B as a share of 100. This page does both, with number-only fields and a copy button next to the result.
Why use this tool
- X% of Y, and A is what percent of B
- Numbers only. Comma or dot as the decimal
- Copy next to the output. Updates as you type
- No account. Unlimited on the free plan
Questions
What does Percentage Calculator do?
It answers two questions: what is X% of Y, and A is what percent of B.
How do I use Percentage Calculator?
Fill one pair with numbers. The result updates as you type. Copy sits next to the result.
What is the formula?
X% of Y is (X ÷ 100) × Y. A as a percent of B is (A ÷ B) × 100. Example: 15% of 200 is 30, and 30 is 15% of 200.
Can I type letters?
No. Fields accept digits, one decimal separator (dot or comma), and an optional minus at the start.
What if the whole is zero?
A percent of B needs B ≠ 0. The right-hand result shows that you cannot divide by zero.
Is there a daily limit?
No. There is no daily cap on this tool.
Do I need an account?
No. Open the page and use it.
Does it work on a phone?
Yes. It runs in the mobile browser.
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