Percentage Calculator

Work out percentages four ways: a percent of a value, what percent one number is of another, the percent change between two numbers, and a percentage increase or decrease. Calculates in your browser.

Result

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Show the math

P% of V = (P ÷ 100) × V

X is (X ÷ Y) × 100 percent of Y

change = (Y − X) ÷ X × 100

result = V × (1 + P ÷ 100)

Percent change uses the first value as the baseline, so going from 200 to 250 is a 25% rise, while 250 back to 200 is a 20% fall, the same gap, different base.

What this does

A percentage calculator works out percentages four ways: a percent of a value, what percent one number is of another, the percent change between two numbers, and a percentage increase or decrease applied to a value.

How to use it

  1. Pick the mode that matches your question.
  2. Enter the two numbers it asks for.
  3. Read the answer, updated as you type.
  4. Switch modes to check a related figure.

How it works

A percent is a fraction of 100. To find what percent A is of B, divide A by B and multiply by 100. Percent change divides the difference by the original value, so the baseline you measure from matters.

P% of N = (P ÷ 100) × N

Understanding your result

Percent change is not symmetric: the same step up and down give different percentages because each is measured from a different starting value, so a 25 percent rise followed by a 20 percent fall returns you to where you began. Always note which value is the baseline before comparing two changes.

Example

15% of 200 is 30. Going from 200 to 250 is a +25% change, but dropping from 250 back to 200 is only −20%, because the starting value is larger the second time.

Sources & methodology

Last updated .

Frequently asked questions

How do I find a percent of a number?

Divide the percent by 100 and multiply by the number. For example, 15% of 200 is (15 ÷ 100) × 200 = 30. Use the "P% of a value" mode to do it instantly.

How is percent change calculated?

Subtract the starting value from the ending value, divide by the starting value, and multiply by 100. Going from 200 to 250 is a +25% change.

Why isn’t a rise and fall the same percent?

Percent change is measured against the starting value. 200 up to 250 is a 25% rise, but 250 back down to 200 is only a 20% fall, because the baseline is larger the second time.

Is my data stored?

No. Every calculation runs locally in your browser, nothing is uploaded or saved.