Percentage Change Calculator: Increase & Decrease
THE DRYDEN / EVERYDAY TOOLS QUICK ANSWERS
PERCENTAGE CHANGE CALCULATOR
Up or down.
By how much.
Find the percentage increase or decrease between two numbers, add or remove a percentage, or work backwards to the original value.
Neither number came first? Compare two values with percentage difference instead.
Percentage difference calculatorBEHIND YOUR NUMBER
A little understanding
goes a long way.
How is percentage change worked out?
Take the difference between the new and old values, divide by the old value, then multiply by 100.
% change = (New − Old) ÷ |Old| × 100
Why doesn’t a 20% rise and a 20% fall cancel out?
Because the second percentage applies to a different starting number. £100 up 20% is £120. £120 down 20% is £96, not £100.
Can I trust the answer?
Yes. These are exact calculations, rounded only for display. Change the number of decimal places under “Add more detail” if you need more precision.
YOUR NUMBERS. MADE CLEAR.Calculations happen on your device.