Percent Change Calculator
Calculate the percent change between two values instantly. Enter the original and new values to get the exact percent change, with the formula and step-by-step explanation.
Percent Change
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A positive result is an increase; a negative result is a decrease.
What is a percent change calculator?
A percent change calculator measures how much a value has moved between two points, expressed as a percent of the original. It is the same calculation as percentage change — the terms are interchangeable — and it always uses the original value as the baseline for before-and-after comparisons.
The formula is ((new value − original value) / original value) × 100. A positive result means the value rose, while a negative result means it fell. The percent change calculator applies this formula instantly and shows the direction of the move, so you can tell at a glance whether things improved or declined.
Use it for prices, sales, scores, traffic, weights, or any pair of values where one comes before the other. Because the result is a percent, you can compare moves across different scales — a 5% rise in a small budget and a 5% rise in a large one are directly comparable.
How to calculate percent change
- 1
Enter the original value
Type the starting number — the earlier figure you are measuring change from, such as a previous price or last quarter's sales.
- 2
Enter the new value
Type the current or updated number you want to compare against, such as the new price or this quarter's sales.
- 3
Read the percent change
The calculator applies ((new − original) / original) × 100 and shows the percent change, with the absolute difference and direction.
Why use this percent change calculator?
Instant and accurate
No manual arithmetic or spreadsheet formulas. Get the exact percent 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 act on the right signal.
Transparent formula
Every result is built on the standard change formula, so you can verify the math and reuse the method for future problems.
FAQ
Frequently Asked Questions
Quick answers to common questions about percentage calculations.
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