Percentage Calculator

Calculate a percentage of an amount using percentage ÷ 100 × amount. Try decimal percentages and distinguish the result from percentage-change calculations.

Find a specified percentage of a starting amount. The calculation is percentage divided by 100, multiplied by the amount. This workspace answers What is X% of Y?; it does not have separate percentage-change or reverse-percentage modes.

100% free
No registration
On your device
Modern browser

1Enter details
2View result

What is (%)

Of Amount

Calculated Percentage ResultLive

30.00

Your input stays on this device for this operation. We don’t upload or store it.

About Percentage Calculator

Live percentage-of calculation

Computes percentage ÷ 100 × amount as the two fields change.

Decimal input

Supports finite decimal values rather than only whole-number percentages.

Display and copy

Shows a two-decimal display; the copy value uses the underlying numeric result.

How to use Percentage Calculator

1
Enter the percentage
Use What is (%) for the rate, such as 15 or 2.5.
2
Enter the amount
Use Of Amount for the starting value. The result updates without a Calculate button.
3
Interpret the answer
The output is the percentage portion, not the remaining balance after a discount. Subtract it yourself when that is your task.

Formats and practical limits

Input: a finite percentage and amount. Output: their percentage portion, displayed to two decimal places.

This is not a tax-rule, currency-rounding or percentage-change engine.
Binary floating-point arithmetic can introduce small rounding differences. Apply any required accounting rules separately.

Practical example

For a 2.5% portion of 80, enter 2.5 and 80. The result is 2.00. For a 15% discount on 200, the portion is 30 and the remaining amount is 170.

Frequently Asked Questions

3 answers

What is 15% of 200?

15 ÷ 100 × 200 equals 30. If that is a discount, subtract 30 from 200 to get a remaining price of 170.

Can I calculate percentage change here?

There is no dedicated change mode. Percentage change requires a starting and ending value and a different formula; do not enter them as rate and amount.

Why can a copied result have more decimals?

The visible value is formatted to two decimals. Copying uses the underlying JavaScript number, which can contain more digits and floating-point rounding effects.

About Percentage Calculator

Live percentage-of calculation

Decimal input

Display and copy

How to use Percentage Calculator

Enter the percentage

Enter the amount

Interpret the answer

Formats and practical limits

Practical example

Frequently Asked Questions

Related Calculators tools

GST Calculator

Discount Calculator

VAT Calculator

Scientific Calculator