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To work out how far a projector should sit from your screen, first choose the screen’s aspect ratio and diagonal size, convert that diagonal to the image’s horizontal width, then multiply the width by the throw ratio listed for your exact projector and lens. For a zoom lens, calculate the minimum and maximum supported distances. Before mounting, check the model’s offset, lens shift, reference points and clearance requirements in its manual or manufacturer calculator.
How do you calculate projector throw distance?
Throw ratio is the distance from the projector’s lens to the screen divided by the image’s horizontal width. Rearranged, the calculation is:
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Throw distance = image width × throw ratio
Sony Support states the relationship as “Width of screen x Lens throw ratio = Throw distance.” Use the throw ratio for the exact projector and lens—not a ratio from another model. The distance is measured from the lens reference point; the projector’s body depth and rear clearance affect where the unit can physically sit.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsHow far should a projector be from a 100-inch screen?
There is no single distance for every 100-inch screen. In these examples, 100 inches means the image’s diagonal, while the calculation needs its width and the projector’s throw ratio. A 100-inch diagonal 16:9 image is about 7.2 feet wide in BenQ’s example. At the example ratio of 1.13:1, that gives a throw distance of about 8.2 feet. This is a BenQ US example, not a universal placement rule.
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Sony’s separate worked example uses a 100-inch-wide image—not a 100-inch diagonal image—and a 1.39:1–2.23:1 zoom range for the VPL-FHZ75. The resulting supported throw-distance range is 139–223 inches (3.53–5.66 m). These two examples cannot be compared by distance alone: they use different image-width assumptions and projector specifications.
What size projector screen fits your room?
Start with the usable wall and where people will sit, rather than choosing the largest screen the wall can hold. Decide which aspect ratio suits your usual content and the available screen area; common formats in BenQ’s guide include 16:9, 4:3 and 2.35:1. A room that cannot accommodate a larger image may be better served by a smaller screen.
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Use viewing angle as a guide, not a rule
BenQ’s screen guide attributes a minimum 30-degree field of view to SMPTE and a 40-degree cinematic recommendation to THX. It also gives diagonal-based heuristics: viewing distance of 1.6 times the screen diagonal for standard viewing, or 1.2 times for cinematic viewing. Treat these as recommendations reported by BenQ, not universal medical or ergonomic standards; your preferred image size and seating arrangement may differ.
How to choose a screen size and calculate the placement
- Measure the room. Measure the usable screen wall and the maximum distance available between the screen and projector lens. Account for seating, doors, windows, the projector body, cables and any planned mount. Check the manual for the model’s precise lens-to-screen reference points.
- Choose the aspect ratio. Match it to the content you watch most and the screen area you can use. Formats discussed in BenQ’s guide include 16:9, 4:3 and 2.35:1.
- Pick a candidate diagonal. Make sure the image fits the wall and suits the intended viewing position; wall capacity alone does not determine a comfortable size.
- Convert diagonal to image width. Use the chosen aspect ratio. Do not insert the diagonal directly into the throw-distance formula. For a 100-inch diagonal 16:9 image, BenQ’s example gives an approximate width of 7.2 feet.
- Look up the exact projector’s throw ratio. For a fixed ratio, multiply image width by that ratio. For a zoom range, multiply the width by both the minimum and maximum ratios to find the supported distance interval.
- Check mounting geometry. Use the manufacturer’s model-specific table or calculator to confirm offset, lens shift, screen position and placement limits. Throw distance alone does not tell you where the image will land vertically.
- Verify before drilling or permanently mounting. Confirm the measurements and image geometry against the selected projector’s installation instructions.
Why the projector model changes the answer
Different projectors can place the same-sized image at different distances. A zoom lens gives a range of possible distances, while lens offset and shift affect how the image aligns with the screen. A short-throw model may suit a shallow room, but the label alone does not establish that it supports your chosen image size or installation: check the exact model’s specifications and placement table.
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Manufacturer tables are model-specific, not interchangeable charts. For example, Epson’s EB-992F reference lists a 100-inch 16:9 image at a projection distance of 134–181 cm with a 23 cm offset. Its 150-inch entry lists 202–273 cm and a 35 cm offset. Those figures describe that model’s table, not projectors generally. Epson also notes that image size changes with distance and can vary with zoom factor, aspect ratio and other settings.
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What to check before installing
- Optical distance: Measure from the lens reference point specified by the manufacturer, not automatically from the projector’s back or front edge.
- Zoom range: Treat the calculated minimum and maximum as the model’s supported interval, then verify the intended position in its calculator or manual.
- Offset and lens shift: Confirm that the projector can place the image at the required screen height and alignment; throw ratio does not determine vertical position.
- Physical clearances: Allow for the projector body, cables, mount and ventilation or other clearances specified by the manufacturer.
- Screen and seat fit: Check the chosen diagonal and aspect ratio against the usable wall and actual seating position before fixing the screen or mount.
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