Projection Throw Calculator

Calculate the required throw distance from lens throw ratio and screen width, or work backwards from a known distance. Includes image size, lens shift, and common projector presets.

Throw Distance from Screen Size

Enter the lens throw ratio and the screen / surface width to calculate the required throw distance.

Throw Ratio (min)

Distance / Width

Throw Ratio (max)

Leave same for fixed lens

Screen Width

Units

Metric Imperial

Aspect Width

Aspect Height

Presets:

Projector presets

Throw Distance (min)

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Throw Distance (max)

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Screen Height

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Screen Diagonal

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Image Area

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Diagonal (inches)

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Reverse: Distance → Screen Size

Enter a known throw distance and lens throw ratio to find the resulting image width and height.

Throw Distance

Throw Ratio

Image Width

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Image Height

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Find Required Throw Ratio

You know the distance and the screen width — what throw ratio lens do you need?