Percentage Calculator

What is X% of Y, and what percent is A of B. Numbers only. Copy sits next to the result.

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Percent of a number

A is what percent of B

How it works

1

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.

2

Read the result

The value updates as you type. 15% of 200 is 30. 30 is 15% of 200.

3

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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