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Maths by Ms B

The Maths toolkit

Percentage Calculator

A percentage amount, a proportion or a change. Choose what you need to find, then see the steps behind the answer.

Make a calculation

Choose a method, then enter your values.
What would you like to find?

Find a percentage of an amount.

A clearer answer starts here

Your result and working will appear here.

Not sure where to start? Choose “Use an example”, then calculate to see the method in action.

Results and working are rounded for display. Calculations stay in this browser and are not saved.

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Understand the method

Three useful ways to work with percentages

A percentage of an amount

Divide the percentage by one hundred, then multiply by the amount.

15% of 80=15100×80=1215\% \text{ of } 80 = \frac{15}{100} \times 80 = 12

A part as a percentage

Divide the part by the whole, then multiply by one hundred. The whole cannot be zero.

2080×100=25%\frac{20}{80} \times 100 = 25\%

Percentage change

Compare the difference with the positive original value, not the new value.

100−8080×100=25%\frac{100 - 80}{80} \times 100 = 25\%
Explore the percentage guide

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