Projector screen size calculator
Enter your throw distance and projector throw ratio to find the largest 16:9 screen that fits. Free calculator with a distance-to-screen-size reference table.
The biggest screen you can use is set by your throw distance ÷ throw ratio. As a rule of thumb, screen width = throw distance ÷ throw ratio, so a 1.2 throw-ratio projector 10 ft back fills about a 115-inch 16:9 screen. Enter your numbers below for the exact maximum.
Max screen size by throw distance
| Throw distance | UST (0.5) | Standard (1.0) | Long (1.5) |
|---|---|---|---|
| 8 ft | 220″ | 110″ | 73″ |
| 10 ft | 275″ | 138″ | 92″ |
| 12 ft | 300″ | 165″ | 110″ |
| 15 ft | 300″ | 207″ | 138″ |
| 20 ft | 300″ | 275″ | 184″ |
How screen size and throw distance relate
A projector’s throw ratio is the throw distance divided by the image width, so the image width you can achieve is the throw distance divided by the ratio. A lower ratio (short- and ultra-short-throw) fills a bigger screen from the same distance, which is why UST projectors can sit inches from the wall. The result here is the maximum at your minimum ratio — zoom in to a smaller image any time.
Need the distance for a fixed screen instead? Use the throw distance calculator. →
Find your maximum screen size
Find it on the projector’s spec page (e.g. 1.2 standard, 0.25 ultra-short-throw).
Up to a 115″ screen
100″ × 56″ image