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Percentage calculator

The math stays in this tab. Nothing is uploaded.

Results

A% of B
25% of 200 = 50
A is what % of B
25 is 12.5% of 200
B plus A%
200 + 25% = 250
Change B → A
200 → 25 = -87.5%

How to use this tool

Work out percentages in this tab: a percent of a number, or what percent one number is of another.

  1. Open Percentage calculator

    A and B start with sample values. Four results appear on the right.

  2. Enter A and B

    A% of B, A as a percent of B, B plus A%, and the change from B to A all update as you type.

  3. Copy the results

    Copy puts all four lines on the clipboard. Nothing is uploaded.

How-to guides

Knowledge

FAQ

Can I calculate a percentage here?

Yes. Enter A and B. The tab shows A% of B, A as a percent of B, B plus A%, and the change from B to A.

Is anything uploaded?

No. The math stays in this tab.

What if B is zero?

“What percent” and percent change are blank when the base is zero.

Are results exact?

They use ordinary JavaScript numbers and are rounded for display.

Can I copy the results?

Yes. Copy puts all four lines on the clipboard.