Percentage Change Calculator
Compare any two numbers to get the percentage change, the absolute change, and the multiplier — for traffic, revenue, rates, anything.
Works for anything: traffic, revenue, conversion rate, followers, ad spend. Month-over-month, year-over-year, before-and-after — just drop in the two numbers.
How percentage change is calculated
Subtract the original value from the new value, divide by the original, and multiply by 100. The calculator also returns the absolute change (the raw difference) and the multiplier (new divided by original), because those three numbers answer different questions. Traffic going from 4,000 to 5,000 is +25%, +1,000, and 1.25× — and which of those you quote changes how the result lands in a report.
Percentage change is always relative to the starting value, which makes it asymmetric. Going from 100 to 50 is a 50% decrease, but going back from 50 to 100 is a 100% increase. The same absolute movement produces two different percentages depending on which end you start from, so a metric that drops and recovers never shows matching percentages.
Percentage change vs percentage points
This is the error that most often makes a report wrong. If a conversion rate moves from 2% to 3%, that is one percentage point, but it is a 50% increase. Both statements are true and they are not interchangeable. Use percentage points when you are comparing two percentages to each other, and percentage change when you are describing growth relative to where you started. Quoting a 50% lift without saying it came off a 2% base is how a modest improvement gets presented as a transformation.
Frequently asked questions
How do you calculate percentage change?
What is the difference between percentage change and percentage points?
What can I use this for?
Why can’t I calculate percentage change from zero?
DigiJaws builds the systems that turn those numbers green month after month.
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