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% Percentage Calculator

Solve the most common percentage questions in one place: find a percentage of a number, work out what percent one value is of another, measure percentage change, or add and subtract a percentage.

🔒Private by DesignYour entries stay in this browser. Nothing you type into this tool is uploaded to WispData.
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How to use the Percentage Calculator

  1. Choose the percentage calculation you need.
  2. Enter the two values shown for that mode.
  3. Read the result instantly and copy it if needed.

About this tool

Percentage calculations appear in shopping, tax, grades, finance, statistics and everyday comparisons. WispData keeps the common formulas together so you do not need a different page for each variation.

WispData puts the interactive tool first and performs the calculation or transformation in your browser whenever possible. No account is required.

Common uses

  • Discounts and markups
  • Percentage increase or decrease
  • Grades and scores
  • Reverse percentage calculations

Frequently Asked Questions

How do I calculate X% of Y?

Multiply Y by X divided by 100. For example, 20% of 150 is 30.

How is percentage change calculated?

Subtract the old value from the new value, divide by the old value, then multiply by 100.

Can a percentage change be negative?

Yes. A negative result means the value decreased relative to the starting value.

Does WispData store what I enter?

No. This tool is designed to process the values you enter locally in your browser unless a page explicitly says otherwise.

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