✓ Effortless Math · Free Tool

Percent Change Calculator

Find the percent of increase or decrease between an old and new value, or the percent error between a measured and actual value — with full step-by-step working.

Percent change:  (new − old) / |old| × 100%
mode
old value → new value

For percent change, enter the original (old) value and the new value. The old value can't be zero.

Results

Percent change
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Amount of change
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Direction
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Ratio (change ÷ original)
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Step-by-step