How do I calculate 15% of a number?

Choose "X% of a number", enter 15 in Percent, then your number in Of. The result updates instantly.

What is percentage change?

Pick "Change from one value to another" and enter the starting and ending values. Positive is an increase, negative is a decrease.

Is this calculator free?

Yes. All ToolDai tools are free, run entirely in your browser, and require no account.

Percentage Calculator

प्रतिशत क्यालकुलेटर

दाइ तयार गर्दैछ… Getting your tool ready

About this tool

Percentage Calculator

Calculate percentages, percentage change, and reverse percentage questions.

Compute X% of a number, work out what percentage one number is of another, find the original value before a percentage was applied, and measure percentage increase or decrease between two values.

Category: Calculators
Where it runs: Your browser
Version: v1.0.0
Price: Free · no sign-up

How to use

Step by step

1
Pick what you want to work out
Choose from "X% of a number", "X is what % of Y", "X is Y% of what", or "Change from one value to another".
2
Fill in the two values
The field labels change to match the mode you picked.
3
Read the result
The answer updates as you type — no button to press.

Frequently asked

Questions

Choose "X% of a number", enter 15 in Percent, then your number in Of. The result updates instantly.