Short-Throw and Ultra-Short-Throw Projectors: A Big Picture from a Few Feet Away
A standard projector needs a room’s length to make a big picture — 9 to 19 feet for a 120″ screen, depending on the model. A short-throw projector makes the same picture from a few feet, and an ultra-short-throw (UST) model does it from a unit sitting right under the screen. If your room is small, your ceiling can’t take a mount, or people keep walking through the beam, this is the category to understand. (New to throw distance? Start with how throw distance works.)
The two categories, by the numbers
It all comes down to the throw ratio — image width multiplied by the ratio gives the lens-to-screen distance (16:9, 120″ screen = 104.6″ wide):
| Type | Typical throw ratio | Distance for a 120″ screen | Example models in our calculator |
|---|---|---|---|
| Standard throw | 1.0 and up | 9 ft and back | Epson Home Cinema 1080 (1.02–1.23) → 8.9–10.7 ft |
| Short throw | about 0.5 – 1.1 | roughly 4.4 – 9.4 ft | Optoma GT1080HDR (0.5) → 4.4 ft; ViewSonic X2-4K (0.69–0.83) → 6.0–7.2 ft |
| Ultra-short throw | about 0.16 – 0.4 | roughly 1.4 – 3.5 ft | Epson EpiqVision Ultra LS800 (0.16–0.4) → 1.4–3.5 ft |
A UST projector doesn’t sit across the room at all: it goes on a low stand or cabinet directly below the screen, inches from the wall, and throws the image up at a steep angle.
Why people choose short throw
- Small rooms. A condo, bedroom or classroom that can’t give a standard projector 12 feet can still have a 100–120″ picture.
- No shadows, no glare. The projector sits in front of the seating, so nobody walks through the beam and presenters aren’t blinded by the light.
- Simpler installation. Often no ceiling mount and no long cable runs — the unit sits on furniture near the screen, close to your media sources.
The trade-off: your screen has to be flat
A steep projection angle magnifies every imperfection in the surface. A slight wave that is invisible with a standard projector can bend straight lines noticeably with a short-throw, and with UST even a small ripple can distort the picture. That changes which screens make sense:
- Best match: fixed frame screens. The fabric is tensioned flat on a rigid frame and stays that way — this is the safest pairing for short-throw and UST. Our fixed frame screens run 100″–150″, in matte white or grey (grey helps contrast in rooms with ambient light — exactly the living rooms UST models are built for).
- Use with care: motorized and manual pull-down screens. A hanging screen can develop waves over time; if you pair one with a short-throw projector, expect demanding standards for flatness, especially toward the edges.
- Placement is precision work with UST. With the projector inches from the screen, a few millimetres of shift moves the whole image, and most UST models have little or no zoom or lens shift to correct with. Measure the stand height and distance before you buy, and plan to align carefully once.
Is short throw right for you?
Choose short throw if your room depth is under about 10 feet, if the projector must sit on furniture rather than a ceiling mount, or if the space doubles as a walkway. Stay with standard throw if you have the depth: the models are more numerous, placement is more forgiving, and any screen type works.
Whichever way you go, check your model in our free Projector Throw Distance Calculator before ordering — it holds the exact throw ratio for dozens of current short-throw, UST and standard models, and shows the screens we carry in your size.
