Percentage Change Calculator

How to calculate Percentage change calculator?

Percentage change measures how much a value has increased or decreased relative to its original value, expressed as a percent.

Use the formula: percentage_change = ((new_value - original_value) / original_value) * 100

Using the Percentage change calculator calculator: an example

Example values: original value = 50, new value = 65.

Step-by-step calculation:

1. Calculate the absolute change: 65 − 50 = 15.
2. Divide by the original value: 15 ÷ 50 = 0.30.
3. Convert to percent: 0.30 × 100 = 30%.
4. Interpretation: the value increased by 30% from 50 to 65.

Frequently Asked Questions

What if the original value is zero?

If the original value is zero, the percentage change is undefined. In that case report the absolute change and explain the original was zero.

How is a decrease shown?

A decrease appears as a negative percentage. For example, 60 from 80 gives (60−80)/80 = −0.25, or −25% (a 25% decrease).

Should I report the result as a percent or decimal?

Report results as a percentage (decimal × 100) unless a decimal ratio is specifically requested. This calculator outputs percent by default.