Projector throw calculator

Calculate throw distance, screen size, or throw ratio — enter any two values to find the third.

Calculate

Throw distance Screen size Throw ratio

Distance ÷ screen width. Common values: 0.5 (short throw), 1.5 (standard), 2.0 (long throw).

Result

Formula: throw ratio = throw distance ÷ screen width

Screen diagonal is converted to width using the aspect ratio via Pythagoras' theorem.