Percentage change from X to Y
What you get
The answer, directly
How much a number changed, as a percentage, with no subtraction to do by hand.
Says which way
States whether it is a rise or a fall, not just a number with a minus sign attached.
Decimals welcome
7.5 and 12.25 work, written with either a point or a comma.
Nothing is stored
Your numbers stay on your page. We do not store them or send them anywhere.
How it works
- Enter the old value.
- Enter the new value.
- You get the percentage change, with its direction.
Worth knowing
What the percentage is measured against
The change is worked out against the old value, not the new one: (new − old) divided by old, times 100. From 40 to 50 that is 10 divided by 40, times 100 — 25%.
Up and down are not the same percentage
A rise and the fall that undoes it are different sizes. 100 up 50% is 150, but 150 down 50% is only 75, not 100. The base changes, so the percentage does too.
Frequently asked questions
Why doesn't a 50% rise get cancelled by a 50% fall?
Because the fall is worked out from a larger number. 100 up 50% is 150, and 150 down 50% is 75, not 100.
What if the old value is zero?
There is no percentage change from zero — nothing to compare the new value against. Enter an old value that is not zero.
Can I use a comma for decimals?
Yes. Both 7.5 and 7,5 work — the page understands either and writes back the form your language uses.
Is the result rounded?
To two decimals, which is what money uses. A whole result is shown whole.