Math calculator
Percentage Change Calculator
Calculate the percent increase or decrease between an old and new value.
Formula
Percentage change formula
Change % = (new value - old value) / old value x 100
A move from 80 to 100 is a 25% increase.
FAQs
What is the percentage change formula?+
Subtract old from new, divide by the old value, then multiply by 100.
How does the Percentage Change Calculator calculate the result?+
It uses the Percentage change formula: Change % = (new value - old value) / old value x 100. A move from 80 to 100 is a 25% increase.
What information do I need to use the Percentage Change Calculator?+
Calculate the percent increase or decrease between an old and new value.
How accurate is the Percentage Change Calculator?+
Percentage Change Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Percentage Change Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Math guide
How to use the Percentage Change Calculator
Calculate the percent increase or decrease between an old and new value. The page also explains the percentage change formula and shows a practical example: A move from 80 to 100 is a 25% increase.
- 1
Enter your details
Enter the values for the percentage change calculator scenario you want to check.
- 2
Check the calculation
Review the result alongside the percentage change formula: Change % = (new value - old value) / old value x 100.
- 3
Compare scenarios
Change one or more inputs to see how they affect the percentage Change Calculator result before you use the estimate.
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