What Is This Tool?
The Percentage Change Calculator measures how much a value has changed, as a percentage of the original. Enter the original value and the new value, and it returns the change with a sign: a plus for an increase and a minus for a decrease. For example, going from 50 to 75 is a +50% change. It works with whole numbers, decimals, and negative values.
How to Use This Tool?
-
Enter the original value.
-
Enter the new value.
-
Click Calculate to see the percentage change.
-
Click the copy icon to copy the result.
Key Features
-
Calculates the percentage change between two values.
-
Shows a plus sign for increases and a minus sign for decreases.
-
Handles whole numbers, decimals, and negatives.
-
Rounds the result to two decimal places.
-
Lets you copy the result with one click.
Examples
-
From 50 to 75 is a +50% change.
-
From 200 to 150 is a -25% change.
-
From -10 to 1 is a +110% change.
-
From 80 to 80 is no change.
Common Use Cases
-
Tracking price increases or decreases over time.
-
Measuring growth in sales, traffic, or followers.
-
Comparing this month's figure to last month's.
-
Checking how much a value rose or fell in reports.
-
Solving percentage change problems for homework.
Tips & Best Practices
-
Put the earlier or starting figure in the original value field.
-
Put the later or final figure in the new value field.
-
A positive result means an increase, a negative one means a decrease.
-
Remember the original value cannot be zero.
-
Copy the result directly to avoid typing mistakes.
Limitations
-
The original value cannot be zero.
-
Results are rounded to two decimal places.
-
It measures change from the original, not the average of both values.
-
Swapping the two values changes the result.
Frequently Asked Questions
-
How is percentage change calculated?
-
Subtract the original value from the new value, divide by the absolute value of the original, and multiply by 100.
-
Why can't the original value be zero?
-
The calculation divides by the original value, and dividing by zero is undefined, so percentage change from zero has no meaning.
-
What does a negative result mean?
-
A negative result means the value decreased from the original to the new value.
-
Is percentage change the same as percentage difference?
-
No. Percentage change measures from the original value, while percentage difference compares two values relative to their average.
Key Terminology
-
Percentage change
-
How much a value increased or decreased, as a percentage of the original.
-
Original value
-
The starting value that the change is measured from.
-
New value
-
The final value being compared to the original.
-
Increase
-
A positive change where the new value is larger than the original.
-
Decrease
-
A negative change where the new value is smaller than the original.