Projector aspect ratio calculator
Enter a screen diagonal to get the exact width and height for any aspect ratio: 16:9, 16:10, 4:3, 21:9, 2.35:1 and 1:1 (golf sim). Free calculator + reference table.
A 100-inch 16:9 screen is 87.2″ wide and 49.0″ tall. The width and height depend entirely on the aspect ratio: the same diagonal is wider and shorter at 2.35:1, and taller at 4:3 or 1:1. Pick your size and ratio below for exact dimensions.
Width & height by aspect ratio (100-inch diagonal)
| Aspect ratio | Width | Height |
|---|---|---|
| 16:9 | 87.2″ | 49.0″ |
| 16:10 | 84.8″ | 53.0″ |
| 4:3 | 80.0″ | 60.0″ |
| 21:9 | 92.1″ | 38.9″ |
| 2.35:1 | 92.0″ | 39.2″ |
| 1:1 | 70.7″ | 70.7″ |
How aspect ratio sets screen dimensions
For a fixed diagonal, the aspect ratio decides the shape: width = diagonal × w / √(w² + h²) and height = diagonal × h / √(w² + h²). A wider ratio like 2.35:1 (cinemascope) gives a longer, shorter image than 16:9 at the same diagonal, while 4:3 and 1:1 (common for golf simulators) are taller. Always size a projector screen by width — not diagonal — when matching it to a wall or a throw distance.
Need the projector distance for this screen? Use the throw distance calculator. →
Get screen width & height
87.2″
Width
49.0″
Height
29.7 ft²
Area
Frequently asked questions
Updated