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Percentage change calculator
Enter a starting value and a final value and get the percentage change, with a clear increase or decrease label. It works for prices, sales, weights and any two numbers.
- Free
- No sign-up
- Runs in your browser
What is X% of Y?
X is what percent of Y?
Percentage change from A to B
Increase or decrease an amount by a percentage
X is P% of what number?
100% private — the calculation is done in your browser and nothing is sent to any server.
Next step
Keep going with your result in another tool. Nothing is uploaded.
How it works
Read the answer
The result appears at the top of the list.
Check the formula
The formula is shown under each result.
How to calculate percentage change
To calculate the percentage change, subtract the starting value from the final value, divide by the starting value and multiply by 100. From 80 to 100 the change is (100 − 80) ÷ 80 × 100 = +25%. In the calculator above, enter both numbers in the section percentage change from A to B, and the result appears at the top with the direction of the change.
The formula
Percentage change = (new value − old value) ÷ |old value| × 100. A positive result is an increase, a negative one is a decrease, and zero means no change. The old value is the base, so it cannot be zero.
A worked example, step by step
A website had 80 visitors on Monday and 100 on Tuesday. Step 1: subtract the starting value from the final one, 100 − 80 = 20. Step 2: divide by the starting value, 20 ÷ 80 = 0.25. Step 3: multiply by 100, which gives +25%. On the way back, from 100 down to 80, the same difference of 20 is measured against 100 and gives −20%, which is why increases and decreases are not symmetrical.
Examples
| From | To | Change |
|---|---|---|
| 80 | 100 | +25% |
| 100 | 80 | -20% |
| 50 | 75 | +50% |
| 250 | 200 | -20% |
| 12 | 30 | +150% |
Where you use it
- Comparing sales, traffic or costs from one period to another.
- Checking a price change, a raise or inflation.
- Body weight, savings and investment returns.
- Reading statistics in the news that quote a change in percent.
Percentage change or percentage points?
If a rate moves from 4% to 5%, it has risen by 1 percentage point, and by 25% in relative terms (1 ÷ 4). Reports often mix the two, so be clear about which one you mean.
Private by design
The calculation runs in your browser as you type. The amounts you enter are never sent to a server, so you can use real prices, invoices and quotes.
Frequently asked questions
What is the percentage change from 50 to 75?
+50%. The difference is 25, and 25 ÷ 50 × 100 = 50.
What is the difference between percentage change and percentage difference?
Percentage change starts from an old value and has a direction. Percentage difference compares two values symmetrically, dividing by their average, with no old or new.
Why does the change from 100 to 80 differ from 80 to 100?
Because the base is different. 100 to 80 is −20% and 80 to 100 is +25%.
Is this converter free?
Yes. There is no sign-up and no limit, and it runs in your browser, so nothing you type is sent to a server.
Does it work on a phone?
Yes. It works in any modern mobile browser, and the result updates as you type.
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