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

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## 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:

- First, determine the final size.
- The final size is given as: 25.

- Next, determine the initial size.
- The initial size is provided as: 10.

- 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

Test your knowledge using the equation and check your answer with the calculator above.

ER = (FS – IS) / IS *100** = ?**