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Percentage increase calculator

Calculate the percentage increase or decrease between an initial and a final value, useful for analyzing price, sales or metric changes.

Processed on your device. Nothing is sent to any server.

Change

+20%

Calculates ((final value - initial value) / initial value) x 100. The result is negative if the value decreased.

Use cases

  • Calculating how much a price went up or down.
  • Analyzing sales variation between two periods.
  • Calculating the percentage growth of a metric.

How it works

  1. 1

    Enter the initial value

    Type the starting value.

  2. 2

    Enter the final value

    Type the value after the change.

Technical details

  • Example: if a price goes from $40 to $50, it rises (50 − 40) / 40 × 100 = +25%. If it drops from $50 to $40, the change is −20%, not −25%.
  • If the initial value is 0, the percentage change is undefined and the calculator shows "-".
  • The result is rounded to 2 decimal places and signed (+ up, − down). You can type decimals with a comma or a dot (12.5 or 12,5).

Frequently asked questions

What does a negative result mean?

It indicates a decrease relative to the initial value; the percentage is calculated the same way but the sign is preserved.

Why doesn't a 25% rise followed by a 25% drop return to the same value?

Because each percentage is taken on a different base. 100 plus 25% is 125, but 125 minus 25% is 93.75. To get from 125 back to 100 you need a 20% drop.

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