Percentage Change

Compare a starting and ending value.

How to use the Percentage Change

Compare a starting and ending value. Fill in the fields above and the result updates instantly, together with the formula behind it.

Formula

(New − Original) ÷ |Original| × 100

Worked example

From 200 to 250 is a 25% increase, a difference of 50.

Important things to know

If the starting value is zero, a percentage change is undefined.

Frequently asked questions

How is the Percentage Change calculated?

(New − Original) ÷ |Original| × 100. Example: From 200 to 250 is a 25% increase, a difference of 50.

What do I need to enter in the Percentage Change?

You enter: Original value; New value. An example value is shown in each empty field, and the result appears as soon as the numbers are valid.

Why is percentage change not symmetric?

Going from 100 to 150 is +50%, but going from 150 back to 100 is −33.3%, because each change is measured against a different starting value.

Can I save or share this calculation?

Yes. Use Copy to copy the result or full example. Share creates a link that puts your chosen values into the URL fragment so another person can reproduce the calculation. Your named saves and recent history stay in your own browser.

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