Percentage Change Calculator
Calculate the percentage change between two values instantly. Enter the original and new values to get the exact percentage change, with the formula and step-by-step explanation.
Percentage Change
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A positive result is an increase; a negative result is a decrease.
What is a percentage change calculator?
A percentage change calculator measures how much a value has moved between two points, expressed as a percentage of the original. Unlike a percentage difference, which treats both numbers equally, percentage change always uses the original value as the baseline, making it ideal for before-and-after comparisons.
The formula is ((new value − original value) / original value) × 100. A positive result means the value increased, while a negative result means it decreased. The percentage change calculator applies this formula instantly and shows the direction of the move, so you never have to guess whether it was a rise or a fall.
Use it for prices, revenue, traffic, weights, scores — any pair of values where one clearly comes before the other. Because the result is a percentage, you can compare changes across very different scales, such as a 10% rise in a small budget versus a 10% rise in a large one.
How to calculate percentage change
- 1
Enter the original value
Type the starting number — the earlier figure you are measuring change from, such as last month's revenue or a previous price.
- 2
Enter the new value
Type the current or updated number you want to compare against, such as this month's revenue or the new price.
- 3
Read the percentage change
The calculator applies ((new − original) / original) × 100 and shows the percentage change, with the absolute difference and direction.
Why use this percentage change calculator?
Instant and accurate
No manual arithmetic or spreadsheet formulas. Get the exact percentage change the moment both values are entered.
Shows direction
The signed result tells you immediately whether the value rose or fell, and by how much, so you can act on the right signal.
Transparent formula
Every result is built on the standard change formula, so you can verify the math and apply the same method yourself next time.
FAQ
Frequently Asked Questions
Quick answers to common questions about percentage calculations.
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