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Percentage Change Calculator

Enter the old value and the new value to see the percentage it went up or down, and the actual difference between the two.

This result is an estimate only. Check with your bank or the relevant authority before making decisions.

How it is calculated

  1. Difference = new value − old value
  2. Change (%) = difference ÷ old value × 100

A positive result is an increase and a negative result is a decrease. The old value cannot be 0. If the old value is negative, the calculator divides by its absolute value, so the sign of the result shows the direction of the change.

Worked example

  • From 80 to 100: difference 20, change +25.00%, an increase
  • From 100 to 80: difference −20, change −20.00%, a decrease

Notice that a 25% rise and a 20% fall are not the same even though the same two numbers are involved, because each starts from a different original value.

Why your number may differ

Make sure the old and new values are not swapped. The result is shown to two decimal places.

Frequently asked questions

What is the percentage change formula?

Change = (new value − old value) ÷ old value × 100.

Why is the result negative?

A negative result means the new value is lower than the old value, which is a decrease.

Why can the old value not be 0?

We divide by the old value, and dividing by zero is not possible.

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