Find your required throw distance
Enter your desired screen size and projector type to get the exact distance you need.
Understanding throw distance and throw ratio
Throw distance is how far the projector sits from the screen. Throw ratio is the relationship between that distance and the screen width - it is the key spec that determines what image size a projector produces at a given distance.
The Formula
Throw Distance = Throw Ratio x Screen Width. So a projector with a 1.5 throw ratio placed 9 feet from the screen produces a 6-foot-wide image (roughly 83" diagonal at 16:9).
Choosing the Right Projector Type
Standard throw (1.5-2.0)
Needs 8-15 feet for a 100" image. Best for rooms with ceiling mounting space and a clear line from the back of the room to the screen.
Short throw (0.4-1.0)
Sits 3-6 feet from the screen. Reduces shadows from people walking in front. Good for smaller rooms or when ceiling mounting is not practical.
Ultra-short throw (0.1-0.4)
Sits inches from the screen. Eliminates shadow issues entirely. Works best with an ALR (Ambient Light Rejection) screen for optimal image quality.
Always check your manual
Throw ratios vary between models within the same category. Your projector's manual lists the exact ratio. Use that with our calculator for a precise result.
| Screen Size | Standard Throw | Short Throw | Ultra-Short Throw |
|---|---|---|---|
| 80" | 9.2-12.3 ft | 3.2-5.7 ft | 0.5-1.5 ft |
| 100" | 11.5-15.4 ft | 4.0-7.1 ft | 0.7-1.9 ft |
| 120" | 13.8-18.5 ft | 4.8-8.6 ft | 0.8-2.3 ft |
| 150" | 17.3-23.1 ft | 6.0-10.7 ft | 1.0-2.9 ft |
Throw distance is measured from the lens to the screen surface - not from the wall or the back of the projector. On ceiling-mounted units, account for the distance the mount drops the projector below the ceiling.
Also calculate your ideal screen size
Know your room dimensions? Calculate the right screen size for your viewing distance.