Percent Change Calculator

Calculate percent change from an original value to a new value, then review the signed change and absolute change in one focused result card.

Measure how much a value changed from the original number

Use this percent change calculator when you want to compare a starting value with a newer value and see the signed percentage change immediately. It is useful for price updates, traffic changes, budgets, forecasts, experiment comparisons, and before-and-after reporting.

Original value New value

Enter an original value and a new value to calculate percent change.

Ready

Enter two values to calculate percent change.

The percent change result will appear here as soon as both values are valid.

Percent change compares the signed difference against the original value.

Enter the original value you want to use as the baseline.
Enter the new value you want to compare against the original amount.
Review the main result to see whether the change is an increase, a decrease, or no change.
Check the signed change and absolute change to understand both direction and size.
Use Example to load a sample comparison or Clear to reset the calculator.

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Calculate the signed percent change from one value to another
Compare before-and-after values with a percent change formula

This tool compares an original value with a new value and returns the signed percent change, the signed change amount, and the absolute change. Percent change is calculated as (new value - original value) divided by the magnitude of the original value, then multiplied by 100. It is useful when you need a direct percent change result instead of a percentage increase-only or percentage decrease-only answer.

A percent change calculator is useful for before-and-after reporting, pricing updates, analytics comparisons, forecasts, inventory reviews, sales checks, and experiment summaries. It helps when the direction of the change matters and you want to know whether the newer value went up, went down, or stayed the same.

Percent change treats the original value as the reference baseline and measures the signed change from there. Percentage difference compares two values symmetrically, so it is better when neither number should act as the starting point.

What is the formula for percent change?

Percent change is calculated by subtracting the original value from the new value, then dividing that signed change by the original value reference and multiplying by 100.

Can this tool show both increases and decreases?

Yes. The calculator shows whether the new value is higher, lower, or unchanged, then returns the signed percent change and the signed change amount.

Why can't the original value be 0?

Percent change uses the original value as the baseline reference. If the original value is 0, the formula would not be valid.

How does this tool handle negative original values?

Percent change is calculated relative to the magnitude of the original value to keep the increase or decrease direction intuitive, even when the original value is negative.

What is the difference between percent change and percent error?

Percent change measures how much a new value changed relative to an original value. Percent error compares an actual value against an expected value and uses the absolute difference instead of a signed change.

Percent Change Calculator

Calculate percent change from an original value to a new value

Measure how much a value changed from the original number

Percent change result

How to use the percent change calculator