Percentage Change Calculator
Old number, new number, the change between them.
FREE · NO SIGN-UP · RUNS ON YOUR DEVICE
Your numbers stay on your device
- 2NUMBERS IN
- 1ANSWER OUT
- 6DECIMAL PLACES
- 0SIGN-UP
What you can count on
- 2numbers
- The old figure and the new one
- Direction is named, up or down
- 6decimal places
- Kept, so repeated steps do not drift
- The working is shown beside it
- 0uploads
- Nothing typed here leaves the tab
- Nothing is stored
Percentage Change Calculator at a glance
- Percent change
- From one figure to another
- The other three questions
- Of, is-of, add or take off
- Precision
- 6 decimal places
- Working
- Shown beside the answer
- Price
- Free
- Account required
- None
- Where it runs
- On your device
How to use Percentage Change Calculator
- 1
Pick percent change
Four questions are named on the panel. Percent change is the one that compares old with new.
- 2
Put in both figures
The old number first, then the new one. The answer updates as you type.
- 3
Copy the answer
One tap copies it, with the working there if you have to show it.
Frequently asked questions
What is the percentage change from 80 to 100?
A rise of twenty-five percent. The twenty that was added is measured against the eighty you started from, not against the hundred you ended on.
Why is a rise then an equal fall not back to the start?
The fall comes off a bigger number. A hundred up fifty percent is a hundred and fifty; that same figure down fifty percent is seventy-five.
Is this the same as percentage points?
No. Four percent to six percent is two percentage points and a fifty percent change. This question gives you the percent change.
Which number goes first?
The old one. Putting them the other way round measures the move from the new figure, which answers a different question.
Where percent change goes wrong
Percent change is one of the four questions on this panel. Choose it, put the old figure and the new figure in, and the answer says how far it moved and which way.
- Measuring the change against the new figure instead of the old one.
- Reading a large percentage from a small base as though it were a large move.
- Rounding at every step instead of once at the end.
- Treating a change in a percentage as a percentage change, when they are different things.
Full specification
| Percent change | Compares a new number against the old one and says whether it went up or down. |
|---|---|
| The other three questions | A share of a number, one number as a percent of another, and adding or taking off a percentage. |
| Precision | Six decimal places are kept, so a chain of steps does not drift. |
| Working | The arithmetic is shown beside the answer, not only the result. |
| Price | Free. Supported by clearly labeled ads placed outside the working area. |
| Account required | No. |
| Where it runs | In your browser tab. Nothing is sent anywhere. |
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