Enter the final size and the initial size into the Enlargement Ratio Calculator. The calculator will evaluate and display the Enlargement Ratio.

## Enlargement Ratio Formula

The following formula is used to calculate the Enlargement Ratio.

ER = (FS - IS) / IS *100
• Where ER is the Enlargement Ratio (%)
• FS is the final size
• IS is the initial size

To calculate an enlargement ratio, subtract the initial size from the final size, then divide by the initial size.

## How to Calculate Enlargement Ratio?

The following example problems outline how to calculate Enlargement Ratio.

Example Problem #1:

1. First, determine the final size.
• The final size is given as: 25.
2. Next, determine the initial size.
• The initial size is provided as: 10.
3. Finally, calculate the Enlargement Ratio using the equation above:

ER = (FS – IS) / IS *100

The values given above are inserted into the equation below and the solution is calculated:

ER = (25 – 10) / 10 *100 = 150.00 (%)

Example Problem #2:

For this problem, the variables required are provided below:

final size = 60

initial size = 30