What is the perfect golf simulator projector throw ratio?

Throw ratio is the distance from the lens to the screen divided by the width of the image. For a golf bay the target is a short-throw projector in BenQ’s published 0.69–0.89 sweet spot, mounted so that the distance the ratio demands lands the lens over the tee. There is no single perfect number, because the number depends on your screen’s width and, in a trap that catches most of the threads this summer, on its shape.

In a Nutshell

The perfect throw ratio is a short-throw in BenQ’s published 0.69–0.89 sweet spot, mounted so the lens sits over the tee; there is no single number, because throw distance is the ratio times the image width. Screen shape changes it too: filling a 4:3 screen’s height takes about a third more throw than 16:9, and a square screen about 78 % more.

👉 Distance = throw ratio × image width. At 0.7–0.9, a 12 ft-wide image needs 8.4–10.8 ft of throw and a 10 ft image needs 7–9 ft — computed from the ratio, and the reason short-throws are the golf-sim default.

• Measure width, not diagonal. Every calculator and every spec sheet works from the image width.
• Screen shape changes the distance. Filling a 4:3 screen with a 16:9 projector needs about 33 % more throw than the same width in 16:9; a square screen needs about 78 % more.
• Zoom trims, it does not fix. A 1.2× zoom is a 20 % adjustment, not a different projector.
• Ultra-short-throw belongs to floor mounts. BenQ reserves the ~0.5 ratio for very tight hitting areas with the unit on the floor.

Jargon, once: throw ratio = throw distance ÷ image width. Throw distance = lens to screen. Image width = the picture’s horizontal size; screens are sold by diagonal. Short-throw ≈ 0.5–0.9; ultra-short-throw = below about 0.4. Optical zoom changes the lens; digital zoom crops pixels. Lens shift moves the image without tilting; keystone squares an angled one. Fill mode sets the aspect preset (4:3, 16:9, 16:10, 1:1); auto screen fit is a different, one-button feature that also sets focus and zoom.

How this has changed since 2020

• 2025–2026: the golf-line short-throws publish a 0.69–0.83 ratio with a 1.2× motorized zoom (BenQ AH700ST and AK700ST; the TK710STi matches the ratio); ViewSonic’s X2-4K matches the range; Optoma’s laser GT2000HDR and GT2100HDR sit at a fixed 0.496.
• 2025–2026: auto screen fit arrived — manual-trigger on the AH700ST, automatic on first use on the AK700ST, absent on the TK700STi. Most reviewers praise it; a smaller group finds it unreliable (8 reports); the manual documents why it fails.
• 2026: the miscalculation pattern moved from forgetting the calculator to trusting a chatbot, and the 1:1 square-screen trap has its own thread.
• BenQ’s own guidance now names 0.69–0.89 as the sweet spot and ~0.5 for floor mounts — narrower than the 0.4–1.1 range early buying guides recommended.
• Unchanged: the formula.

The formula, worked three ways

Ratio = distance ÷ width, so distance = ratio × width. Three examples, all computed:

• A 0.5 projector and a 15 ft-wide image: 0.5 × 15 = 7.5 ft from the screen.
• A 0.8 projector: 8 ft back for a 10 ft image, 12 ft back for a 15 ft image.
• A 2.0 long-throw and a 10 ft image: 20 ft — which is why an office projector does not fit a bay.

Every cell is computed from the published ratio. Cross-check against a manual: the LK936ST’s own table gives 1,793–1,970 mm for a 100 in image that is 2,214 mm wide, and 0.81–0.89 × 2,214 reproduces it. The mounting article carries the full per-model table with zoom, lens shift and offset.

So what is “perfect”?

The answer: 0.69–0.89, mounted over the tee. BenQ’s guidance for golf simulators calls a short-throw ratio between 0.69 and 0.89 the sweet spot, with a low, floor-mount-only ratio around 0.5 necessary only for extremely tight hitting areas. The site’s band is a little wider at roughly 0.5–0.9, with the 0.5 end reserved for those floor mounts. Inside that band, the perfect ratio is whichever one puts the lens above the tee, slightly behind the ball, because a projector mounted farther back throws more of your body onto the screen — the placement rules are at Where to Mount your Golf Simulator Projector – Pitfalls + Example Placements.

I believe the ‘short throw’ projectors are the sweet spot here because if you buy an ultra short throw projector and mount it 1-2ft to the screen, you may end up in one of two scenarios: the unit sits on the floor in the ball’s path, where strikes on floor-mounted projectors are a rising complaint (8 reports from 6 owners), or it sits between you and the picture.

For most golfers, it makes more sense to buy a purpose-built short throw projector — like the BenQ AH700ST or AK700ST (0.69–0.83:1) — rather than trying to retrofit an existing model. The latest 2024–2025 golf-ready projectors are designed for easy setup, safety, and image quality straight out of the box.

AH700ST owners’ crowdsourced advice, in three lines (nine reports): switch the fill mode to 4:3 for a square-ish screen, plan the distance with BenQ’s planner rather than by eye, and keep keystone to a minimum.

The screen-shape trap: aspect ratio changes the distance

Every projector in the table is 16:9 native except the L790SE (16:10). On a 4:3 or square screen you have a choice: fill the width and leave the top and bottom blank, or fill the height with the 16:9 rectangle, let the sides spill past the frame, and crop them with a custom resolution on the PC. Owners do the second, and the LK936ST crowd has made it routine (13 reports).

Worked: a 12 ft-wide 4:3 screen with a 0.8 projector needs 0.8 × 16 ft = 12.8 ft of throw, not 9.6 ft. The owners’ rule of thumb — 4:3 needs roughly 20 % more — undershoots; the geometry says a third.

The June thread that started with chatbot guidance ended here: “Move it back until you can fill the vertical space on your screen with the 16×9 image. Don’t worry about the horizontal overshoot”, then a custom resolution — 1440 × 1080 for a 1080p projector on a 4:3 screen, 2880 × 2160 for 4K. The August square-screen thread ran the same way: a 114 in square screen is 9.5 ft high, the 16:9 rectangle that fills it is 16.9 ft wide, and at 0.69 that is 11.7 ft of throw. One commenter’s calculator agreed (“11 or so feet”); an owner of a near-identical build “needed to be a few feet further back to account for the 1:1”.

The 16:10-or-4:3 question sat unanswered on Reddit this August; the arithmetic answers it: 16:10 costs 11 % more throw and buys a little vertical room, 4:3 costs 33 % and buys a lot. Fill presets by model:

• AH700ST / AK700ST: 16:9, 16:10, 4:3, 1:1
• LK936ST: Auto, 4:3, 16:9, 16:10, 2.4:1
• LS800: 4:3, 16:10
• X2-4K: its manual documents a 16:9 image on a 4:3 screen

Screen sizing itself is at The Vital Link between Aspect ratio and Impact Screen Size.

Zoom, lens shift and auto screen fit: trims, not fixes

For golf simulators, it’s best to choose a projector with the right native throw ratio (around 0.8:1) rather than relying on zoom to “fix” distance issues. Use zoom only for fine adjustments, not as the primary solution.

Auto screen fit, where it exists, sets focus, zoom and aspect from one button, and the AH700ST’s manual sets its conditions:

• A screen border at least 6 cm thick once the projector is beyond 3 m.
• A projection angle within 10° for 16:9 and 16:10 screens, or within 20° for 4:3 and 1:1 screens, when the projector sits under 2.2 m from the screen.
• When it fails — markers outside or on the border, or the wrong screen ratio — the manual’s fixes are distance, aiming straight at the screen, and the corner-fit tool; owners’ fix is to overflow every edge first (8 reports, a separate group from the unreliability reports).

Interchangeable-lens projectors exist for professional installs, not as a home-sim path.

Are short-throws more expensive?

There are no verified price tiers on file, so here is what owners and reviewers reported this summer, with today’s retail price where one is listed (21 October 2026).

Short throw projectors are built with specialized optics, which makes them more expensive than standard throw models. But with golf simulation, the investment is worth it — you get the right throw ratio, safer mounting positions, and far fewer shadows.

The $79 report is one owner’s luck, not a recommendation, and the AH700ST itself is $2,299 at BenQ and Carl’s Place (21 October 2026). BenQ AH700ST · BenQ AK700ST · Optoma GT2000HDR

Ultra-short-throw: when it is the answer

Use ultra-short-throw only when a ceiling mount is impossible. The Epson LS800 runs 0.16–0.40, which puts it between about 1.6 ft and 4 ft from a 10 ft-wide image. BenQ’s floor-mount picture for a ~0.5 projector is the unit 8–9 ft from the screen with the hitting area starting at least 3 ft in front of it, for 12–15 ft of total depth.

Ultra short throw projectors are fantastic (and expensive) but you’d have to position them a little too close to the screen. I’d be worried I’d nail it with a ball, or that it would obscure my view of the screen from where I’m swinging (especially if you have it mounted in a protective case). A short-throw projector seems to be the sweet spot.

No thread this summer recommended a specific ultra-short-throw for a golf bay; the only in-window mentions are the worry above, and the strike-damage complaints on floor units are rising. Take it as the answer only when a ceiling mount is impossible.

The other numbers that decide it

• 3,500–4,000 lumens is the site’s floor for a lit room; picks at Best Golf Simulator Projector 2026 – 6 Step Buying Guide + Setup Examples.
• Contrast. Marketed contrast figures are inflated (6 reports); judge by lumens and a demo.
• Resolution. Shoppers weigh 4K below throw, lumens and keystone (11 reports), yet 1080p owners regret it on big screens — 4K Golf Simulator Projectors – Complete 2026 Guide.
• Room depth. Throw distance is only part of it — the total space is at How much space do you need for a Golf Simulator?.
• Order of operations. An installer with twenty years’ experience lists choosing the projector last as a common mistake: “Projector choice is connected to screen size, aspect ratio, image height, throw distance, mounting position and the golfer’s shadow.”
• Check out my dedicated article all about golf simulator projector mounting positions and placement. Where to Mount your Golf Simulator Projector – Pitfalls + Example Placements

Throw ratio FAQ

What is a projector throw ratio?

Throw distance divided by image width. A 0.8 projector sits 8 ft from a 10 ft-wide image.

What ratio is ideal for a golf simulator?

BenQ’s published sweet spot is 0.69–0.89 for ceiling mounts; the site’s band is about 0.5–0.9 with 0.5 for floor mounts.

Standard-throw, short-throw or ultra-short-throw?

Short-throw. A standard 1.5–2.0 projector needs 15–20 ft for a 10 ft image; an ultra-short-throw sits on the floor in the ball’s path.

Does screen size change the throw ratio?

No — the ratio is fixed by the lens. Screen size changes the distance: width × ratio.

Can zoom fix a wrong ratio?

Only by about 20 % on a 1.2× lens, and not at all on a fixed-lens Optoma. Buy the ratio you need.

Does mounting far back cause shadows?

Yes. The farther back the lens, the more of your body is in the beam; short-throws over the tee avoid it.

Why does a 4:3 or square screen need more distance?

Because the 16:9 rectangle that fills its height is wider than the screen — a third wider for 4:3, 78 % wider for 1:1 — and the ratio multiplies that width.

Which calculator checks the throw ratio?

ProjectorCentral’s throw calculator or BenQ’s golf-simulator planner. For a 4:3 or 1:1 screen, enter the screen height and let the width show wider; BenQ’s tool has a 1:1 setting.

Throw ratio or resolution first?

Throw ratio. A 4K projector that cannot fill the screen from your ceiling is the wrong projector.

Bottom line

Width times ratio is the distance; a 4:3 or square screen adds a third or more; the perfect ratio is the one that lands the lens over the tee.