Percentage Change Calculator
Compare an original and new value to calculate the percentage increase or decrease and the exact difference.
Values to compare
Percentage change
How to use this calculator
- 1
Enter the original value before the change.
- 2
Enter the new value after the increase or decrease.
- 3
Read the percentage change and absolute difference. A positive result is an increase; a negative result is a decrease.
Understanding your results
Percentage change compares the difference with the magnitude of the original value: ((new − original) ÷ |original|) × 100. The sign tells you the direction, while the absolute difference shows the raw change. Because division by zero is undefined, a zero starting value has no finite percentage change. To find a simple portion instead, use the percentage calculator; for price reductions, try the discount calculator.
Frequently asked questions
What is the percentage change formula?
Subtract the original value from the new value, divide by the absolute value of the original, then multiply by 100.
What is the difference between percentage increase and decrease?
The formula is the same. A positive result means an increase, while a negative result means a decrease.
Why can’t percentage change start from zero?
Percentage change divides by the original value. Division by zero is undefined, so there is no finite percentage increase from zero.
Can percentage change be greater than 100%?
Yes. A value that more than doubles has increased by more than 100%.
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Disclaimer
CalcPilot's results are estimates for everyday and planning use. Verify critical decisions with an authoritative source. Review our calculation methodology and full disclaimer.