Percentage Calculator Online

Calculate percentages, increases, decreases, proportions, and find original values. 9 calculation types covering every common percentage problem.

What is%of?
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is what percentage of?
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A value ofincreased to. What was the percentage increase?
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A value ofdecreased to. What was the percentage decrease?
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overis what percentage?
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I have a value ofand want to increase by%. What is the result?
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I have a value ofand want to decrease by%. What is the result?
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A value increased by%and became. What was the original value?
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A value decreased by%and became. What was the original value?
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How to use

  1. Find the calculation type that matches your problem from the 9 options below.
  2. Enter the values in the input fields and click Calculate.
  3. Click Copy to copy the result to your clipboard.

Frequently asked questions

How do I calculate what percentage one number is of another?

Divide the part by the whole and multiply by 100. For example, 25 is 50% of 50 because (25 / 50) × 100 = 50%.

How do I calculate percentage increase or decrease?

For increase: ((new − original) / original) × 100. For decrease: ((original − new) / original) × 100. For example, going from 80 to 100 is a 25% increase.

How do I find the original value before a percentage change?

For an increase of X% that resulted in Y: original = Y / (1 + X/100). For a decrease of X% that resulted in Y: original = Y / (1 − X/100).

Is my data sent to a server?

No. All calculations happen entirely in your browser using JavaScript. Nothing is sent to any server.

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