How is change calculated for a negative start?

Change is (B − A) / |A| × 100. The formula and a note show this convention.

Can I reverse a 100% decrease?

No. Every starting value becomes zero, so the original value cannot be recovered.

No. Percentage points are B minus A, while relative percent change divides by the original magnitude.

Calculate percentages, percentage changes, reverse percentages and percentage point differences with substituted formulas.

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Calculation

What is 15% of 200?

Enter a percentage and the value to take it from. Negative percentages and values are allowed.

Percent

Of value

15% of 200 is 30.