Throw distance is how far your projector sits from the screen to produce a given image size. Get it right and you fill the screen with a sharp picture; get it wrong and the image is too small, too big, or out of focus. Here’s how to calculate the correct distance for your room.
What Is Throw Distance and Throw Ratio?
Every projector has a throw ratio — the relationship between distance and image width. The formula is simple:
Throw distance = Throw ratio × Screen width
So a projector with a 1.5 throw ratio, on a 2-metre-wide screen, needs to sit 3 metres back (1.5 × 2 = 3). Check your projector’s spec sheet for its throw ratio — most standard projectors fall between 1.2 and 1.5.
Short-Throw vs Standard-Throw
- Standard throw (1.2–2.0): needs the most space; the projector sits across the room.
- Short throw (0.4–1.0): produces a big image from close up — great for small rooms.
- Ultra-short throw (under 0.4): sits just inches from the wall, like a Laser TV.
Quick Throw Distance Chart
For a typical standard projector with a 1.5 throw ratio (16:9 screen):
| Screen Size (diagonal) | Screen Width | Approx. Throw Distance |
|---|---|---|
| 60 inch | 1.33 m | 2.0 m |
| 80 inch | 1.77 m | 2.65 m |
| 100 inch | 2.21 m | 3.3 m |
| 120 inch | 2.66 m | 4.0 m |
| 150 inch | 3.32 m | 5.0 m |
Multiply the screen width by your own projector’s throw ratio for an exact figure.
Tips for Getting It Right
- Measure your room first, then choose a projector whose throw ratio fits the distance.
- Use the optical zoom (if fitted) for fine adjustment instead of moving furniture.
- In a small room, pick a short-throw model rather than shrinking the image.
- Keep the projector level and square to the screen so you don’t need heavy keystone.
Find the Right Projector
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Related Guides
Distance affects focus, so see why your projector picture is blurry. Pair the right distance with a quality projector screen, and if you’re planning a big setup, our guide on the 150-inch screen size shows the space you’ll need.