📈 Percentage Change Calculator

Calculate the percentage increase or decrease between an original and a new value instantly.

Original value

New value

Enter the two values

Percentage change formula

Percentage change = ((New − Original) ÷ |Original|) × 100

Example 1 — Increase: From 80 to 100 → (100−80)÷80×100 = +25% increase

Example 2 — Decrease: From 200 to 150 → (150−200)÷200×100 = −25% decrease

Example 3 — Price rise: A product goes from £45 to £54 → (54−45)÷45×100 = +20% increase

Frequently asked questions

What is the difference between percentage change and percentage difference?

Percentage change uses the original value as the reference point. Percentage difference uses the average of the two values. Use percentage change when one value clearly comes before the other (e.g. old vs new price).

Can percentage change be more than 100%?

Yes. If a value doubles, the percentage increase is 100%. If it triples, it is 200%. There is no upper limit on percentage increase.

What if the original value is negative?

The calculator uses the absolute value of the original in the denominator to handle negative starting values correctly.