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Percentage calculator

Three everyday percentage questions, answered as you type.

What is % of ?
is what % of ?
From to is a change of

Private by design: this tool runs in your browser. Nothing you add is uploaded.

How to use it

  1. Pick the line that matches your question: a percentage of a number, what percentage one number is of another, or the change between two numbers.
  2. Type the two numbers on that line.
  3. Read the answer at the end of the line. It updates as you type.
Screenshot of the Percentage calculator tool on Sureno, in use
Percentage calculator in use: a real screenshot of this page.

Questions and answers

How do I work out a discount?

For 25% off $80, use the first line: 25% of 80 is 20, so you pay 60.

How do I work out a percentage increase?

Use the third line: from the old number to the new one. From 50 to 60 is a 20% increase.

Is there a quick way to find 10%?

Move the decimal point one place left: 10% of 85 is 8.5. Double it for 20%.

Related tools

Discount calculatorWhat you really pay after a discount, even "an extra 20% off".Sales tax calculatorAdd sales tax or VAT to a price, or take it out.Tip calculatorWork out the tip and split the bill.Margin calculatorProfit margin and markup from a cost and a price.Final grade calculatorWhat you need to score on a final to reach a grade.Savings calculatorSee how savings grow with compound interest.

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