Projector Mount Calculator
Short-throw projector on a roof mount — how far from the wall does it go?
Enter your room
Ceiling height and the picture you want
Enter the ceiling height, then any one of picture width, picture height or lens distance. The other two follow.
Place the projector lens
Tilt up
Picture top from floor
Picture bottom from floor
Picture centre (horizon)
Lens height from floor
How it works
Where the picture goes
Enter a shooter height and the picture is centred on the shooter's eyes (about 11 cm / 4 in below the top of the head), so the horizon of the scene sits at eye level. Without it, the picture top goes to the max picture top — 2.80 m (9′ 2″) by default.
The picture can go right up to the ceiling, but never above it or above the max picture top. If either stops it, the horizon ends up below eye level and the page tells you by how much. With a high ceiling the projector simply tilts less and stays flatter.
The projector hangs upside down and is tilted up, then straightened with keystone. Tilting moves the picture further from the projector, so the lens distance depends on the tilt as well as the picture size.
All distances are to the lens, not to the mount. The 3-arm mount slides forward, back and sideways, so fix it wherever suits the ceiling and adjust until the lens ends up at the distance shown.
Before You Drill
- Test it first: we recommend switching the projector on and holding it at the spot the calculator suggests, to check that the picture matches before you drill.
- Measure to the lens, not the mount: the distance is from the projection wall to the projector lens. Don't drill at that spot — the 3-arm mount slides forward, back and sideways, so fit it where the ceiling allows and adjust until the lens is there.
- Check for obstacles: lights, beams and ventilation between the mount and the wall.
- Fine-tune on site: set the tilt, then keystone until the picture is square.
Results are a planning guide — allow a few centimetres for adjustment.