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Find the percentage increase or decrease between two values.
Enter your numbers to see the answer.
Percentage change calculator guide
Find the percentage increase or decrease between two values. This free online calculator is designed for people who need a quick, transparent estimate rather than a black-box answer. Enter original value, new value, review the assumptions, and adjust the values to match your project or situation.
Percentage change = (new value − original value) ÷ original value × 100.
For a useful first estimate, start with the sample values already shown in the calculator, then replace them with your own measurements or figures. Keep all dimensions in compatible units and round up where the result represents a quantity you must buy.
Use the result for planning, then confirm taxes, fees, contract terms, and other business-specific assumptions.
How it works
Find the percentage increase or decrease between two values. This tool explains the calculation so you can adjust the assumptions to match your situation.
Common questions
Find the percentage increase or decrease between two values. The page shows the result, a breakdown, and the formula used so you can check the calculation.
You will need original value, new value. The labels and units beside each field show what the calculator expects.
Use the result for planning, then confirm taxes, fees, contract terms, and other business-specific assumptions. Accuracy depends on the quality of the inputs and the assumptions used by the underlying formula.