A short throw projector is a projector designed to create a large image from much closer to the wall or screen than a standard model. In practical terms, that usually means a throw ratio somewhere around 0.4:1 to 0.7:1 rather than the more common 1.1:1 to 1.5:1 range.
The benefit is easier placement in smaller rooms, where you may not have enough distance for a normal projector. It does not automatically make the projector better overall, but it can make a big-screen setup much more realistic in tighter spaces.
How much distance does a short throw projector need?
A short throw projector usually needs roughly 1 to 2 metres of distance to create an image around 90 to 120 inches, though the exact result depends on the model and its throw ratio. That is much closer than a standard projector, which often needs several metres for the same screen size.
Because the ratios vary, it is still important to check the specific projection calculator or distance chart for the model you want. The whole reason to buy short throw is placement flexibility, so the exact distance matters more here than it does in many other categories.
Is a short throw projector good for small rooms?
Yes, a short throw projector is often a very good fit for a small room because it can produce a large image without forcing you to place the projector far back. That makes it easier to avoid awkward room layouts, people walking through the beam, and long cable runs.
The main limit is that a small room still needs enough wall or screen space, and some short throw models are more sensitive to alignment than people expect. Even so, for tight spaces they are usually far easier to live with than standard long-throw projectors.