Percentage Change Calculator
Compare an old value with a new one and see the percentage increase or decrease. Useful for prices, scores, and growth.
Quick answer: enter your details below and click Calculate — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Calculators
Enter your details below.
How to use
- Enter the old (starting) value.
- Enter the new value.
- Read the percentage change and whether it is an increase or a decrease.
About this tool
This tool subtracts the old value from the new value, divides by the old value, and multiplies by 100. A positive result is an increase and a negative result is a decrease. The starting value must not be zero, because change from zero cannot be expressed as a percentage.
Frequently asked questions
What if the old value is zero?
A percentage change from zero is undefined, so the tool asks for a starting value greater than zero.
What does a negative result mean?
A negative result means the value went down, so it is a percentage decrease.