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Math Calculators

Percentage Increase/Decrease Calculator

Measure how much something grew or shrank in percentage terms, or apply a percentage rise or cut to a number. Useful for prices, salaries, populations, scores and anything that changes over time.

Percentage increase25%Up by 300

Difference: 300
New ÷ original: 1.25×

Step-by-step working

Difference = new − original = 1,500 − 1,200 = 300
Divide by the original: 300 ÷ 1,200 = 0.25
Multiply by 100 = 25%

How to use the Percentage Increase/Decrease Calculator

Choose whether you are comparing two values or applying a percentage.
Enter the values.
Press Calculate to see the percentage, the absolute difference and the working.

Formula

Percentage change = (New − Original) ÷ |Original| × 100

Increase by P% = Value × (1 + P/100) Decrease by P% = Value × (1 − P/100)

Examples

Rent rise: 1,200 → 1,500 is (300 ÷ 1,200) × 100 = 25% increase.
Price cut: 80 → 60 is (−20 ÷ 80) × 100 = 25% decrease.
Why +25% then −25% is not zero: 100 → 125 → 93.75, because the second 25% is taken from a larger number.

Frequently asked questions

Is percentage change the same as percentage difference?

No. Percentage change compares to the original value. Percentage difference compares two values to their average and has no direction.

What about percentage points?

If an interest rate moves from 5% to 6%, that is a rise of 1 percentage point but a 20% increase in the rate itself.