Enter the throw distance (ft) and the image width (ft) into the Throw Ratio Calculator. The calculator will evaluate and display the Throw Ratio.

## Throw Ratio Formula

The following formula is used to calculate the Throw Ratio.

THR = TD / IW
• Where THR is the Throw Ratio ( )
• TD is the throw distance (ft)
• IW is the image width (ft)

To calculate the throw ratio, divide the throw distance by the image width.

## How to Calculate Throw Ratio?

The following example problems outline how to calculate Throw Ratio.

Example Problem #1:

1. First, determine the throw distance (ft).
• The throw distance (ft) is given as: 10.
2. Next, determine the image width (ft).
• The image width (ft) is provided as: 8.
3. Finally, calculate the Throw Ratio using the equation above:

THR = TD / IW

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

THR = 10 / 8 = 1.25 ( )

Example Problem #2:

For this problem, the variables required are provided below:

throw distance (ft) = 8

image width (ft) = 4