This projector throw ratio calculator helps you optimize your installation. Simply enter the throw distance and image width to determine the ratio, or provide the ratio and one other measurement to find the missing value. It is an essential tool for home theater planning, classroom configurations, and professional AV installations.
What is a projector throw ratio? The throw ratio identifies how far a projector must be placed from a screen to produce an image of a specific width. It is calculated using the following formula: Throw Ratio = Distance ÷ Width.
To find the throw ratio: Input your throw distance and image width. Leave the throw ratio field blank and click "Calculate."
To find the throw distance: Enter the projector's throw ratio and the desired image width. Leave the distance field blank and click "Calculate" to determine where to mount the projector.
To find the image width: Enter the throw ratio and the throw distance. Leave the width field blank and click "Calculate" to see the resulting image size.
Units of measurement: You can use any unit—such as feet, meters, or inches—as long as you use the same unit for both distance and width.
Typical ratios: Most standard projectors fall between 1.5 and 2.0. Short-throw projectors typically range from 0.4 to 1.0, while ultra-short-throw models range from 0.2 to 0.4. Always refer to your specific projector manual for the manufacturer's exact specifications.