Percentage Increase Calculator

How much did a value grow, as a percentage of where it started?

Quick answer: an increase from 80 to 92 is +15% — (92 − 80) ÷ 80 × 100 = 15%.

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The formula

Percentage increase = (new − old) ÷ old × 100. The denominator is always the old value — the growth is measured against where you started, not where you ended. Using the new value as the base is the most common mistake in this calculation: a rise from 80 to 92 is 15% (base 80), not 13.04% (base 92).

Worked examples

A salary rising from 50,000 to 58,000 grew by (58,000 − 50,000) ÷ 50,000 × 100 = 16%. A price rising from 40 to 50 grew by 10 ÷ 40 × 100 = 25%. Doubling any value is always a 100% increase, and a value that stays the same has increased by 0%.

To apply an increase instead — "what is 200 increased by 15%?" — use the Increase by % mode on the main calculator.