How to use this percent change calculator
Enter the requested values above and select Calculate. The result updates immediately on the page, so you can change one value and compare different scenarios without leaving the calculator.
Formula and method
Example
A change from 80 to 100 is a 25% increase.
What this calculator is useful for
Calculate percentage increase or decrease from an original value to a new value. It is designed for quick estimates and everyday problem solving. When a calculation affects a contract, tax filing, medical decision or other high-stakes situation, verify the result with the appropriate professional or authoritative source.
Frequently asked questions
What does the Percent Change Calculator calculate?
Calculate percentage increase or decrease from an original value to a new value.
How does the calculation work?
Percent change = (new − original) ÷ |original| × 100.
Is this calculator free?
Yes. ERICH Calculators is free to use and no account is required.