Projector Throw Calculator
Enter the desired image width and the throw ratio published for your projector lens.
A QUICK WALKTHROUGH
How to use this tool
- Enter image width and lens throw ratio.
- Calculate the estimated lens-to-screen distance.
- Compare the result with the projector and lens installation manual.
Formula and scope
Estimated lens-to-screen distance = image width × throw ratio. Throw ratio varies by projector and lens, including zoom range; use the value specified by the manufacturer for your setup.
Planning estimate
This does not account for lens shift, mounting geometry, focus limits, obstructions, keystone correction, or installation tolerances. Confirm fit with the equipment manual before mounting.
Local calculation
Values are processed in this browser and are not uploaded.
GOOD TO KNOW
Common questions
Where do I find throw ratio?
Check the projector or lens manufacturer specifications for the installed lens and zoom setting.
Is this a mounting instruction?
No. It gives only the arithmetic estimate; verify clearances and setup in the equipment documentation.