This reverse percentage calculator will help you determine the original amount before a percentage decrease was applied.

## How the Reverse Percentage Calculator Works

This calculator helps you find the original amount before a percentage increase or decrease. To use it, input the total value you currently have, which is the amount after the percentage has been applied. Then, input the percentage value of the increase or decrease. Click “Calculate” to see the original value.

The calculator subtracts the percentage value from 100% to find the original amount before the change. If, for example, an item costs $120 after a 20% increase, the calculator will determine what the cost was before that increase.

## How to Use the Reverse Percentage Calculator

- Enter the total value (the value after the percentage was applied) in the first field.
- Enter the percentage value in the second field.
- Click the “Calculate” button.
- The original amount before the percentage was applied will be displayed.

## Limitations

The calculator assumes a simple percentage change and does not account for compound percentages or multiple sequential percentage changes. It also does not handle values of 100% or more, which could imply a total value equal to or less than the original amount. Always verify the results independently for critical calculations.