Percentage change = (new − old) ÷ old × 100. Going from 100 to 150 is a +50% increase; from 150 to 100 is a −33.3% decrease. Enter the old and new values below.
What is Percentage Change Calculator?
Percentage change tells you how much a number grew or shrank relative to its starting point. It's how you report traffic growth, conversion lifts, revenue swings, and campaign improvements in a way stakeholders instantly understand.
How it works
Percentage change = ((new − old) ÷ old) × 100. Traffic from 1,000 to 1,250 is a 25% increase; revenue from $10,000 to $8,000 is a 20% decrease. The sign tells direction, the number tells magnitude.
How to use this tool
Enter the original value and the new value. The tool returns the percentage change and whether it's an increase or decrease. Use it for month-over-month and year-over-year reporting.
Why it matters
Raw numbers hide context; percentage change reveals momentum. '500 more visitors' means little on its own — but '+50% month over month' immediately signals a trend worth investigating or celebrating.
Frequently asked questions
How do I calculate percentage increase?
Subtract the old value from the new, divide by the old value, and multiply by 100. From 200 to 250 is (50 ÷ 200) × 100 = 25% increase.
What's the difference between percentage change and percentage points?
Percentage change is relative; percentage points are absolute. A conversion rate going from 2% to 3% is a 1 percentage-point rise but a 50% relative increase — both are correct, and mixing them misleads.
Can percentage change be over 100%?
Yes. If a value more than doubles, the increase exceeds 100%. Going from 10 to 30 is a 200% increase.