What Is Throw Ratio and Why Should You Care

title: Golf Simulator Projector Throw Distance description: “Golf Simulator Projector Throw Distance — everything you need to know. <div class=“answer-block” What throw distance do ybuilds. Get it wrong and your image is too big, too small, or blocked by your ownswing.“ pubDate: 2026-07-06 updatedDate: 2026-07-06 author: Ace category: space-setup difficulty: intermediate readTime: 14 min read tags: [projector, throw-distance, throw-ratio, short-throw, ultra-short-throw, ceiling-mount, image-size, screen-size, projector-placement, installation, DIY] featured: false order: 29

I have seen more golf simulator builds ruined by projector placement than by any other single mistake. Not the launch monitor. Not the enclosure. Not even the hitting mat. The projector.

Here is the problem: you pick a screen size, buy a projector based on a blog post that says “this is great for golf sims,” mount it on the ceiling, and then discover the image is either smaller than your screen, bleeding off the edges, or casting a silhouette of your entire backswing across the center of the impact zone.

Every one of those problems comes from misunderstanding throw distance.

Throw distance is not optional math. It is not a “you should probably check” spec. It is the single physical constraint that determines whether your projector placement works or does not work. And once you cut a hole in your ceiling drywall to run HDMI cable through the joists, you are not moving the mount.

What Is Throw Ratio and Why Should You Care

Throw ratio is the relationship between the distance from the projector lens to the screen and the width of the image. It is expressed as a ratio:

Throw Ratio = Throw Distance (lens to screen) / Image Width

A projector with a throw ratio of 0.50:1 produces a 10-foot-wide image when the lens is 5 feet from the screen. A projector with a throw ratio of 1.20:1 needs 12 feet to produce that same 10-foot-wide image.

That is the entire math problem. The rest is just applying it to your room dimensions.

Golf simulators need wide images. A typical setup uses a screen that is 8 to 12 feet wide. That means the throw distance requirement grows fast as you move away from short-throw projectors.

The Three Categories

Ultra-short-throw (UST): Throw ratio under 0.40:1. These projectors sit very close to the screen – typically on a shelf or floor stand directly below or above the screen, or mounted on the ceiling a few feet behind the hitting area. The Optoma GT1090HDR (0.25:1) is the most common UST in golf sims. It can produce a 10-foot image from 2.5 feet away. This is the category for rooms where you cannot mount a projector on the ceiling or where ceiling height limits the mount position.

Short-throw: Throw ratio 0.49:1 to 0.80:1. This is the sweet spot for 90 percent of residential golf simulators. The BenQ AK700ST (0.69-0.83:1), BenQ TH671ST (0.69-0.83:1), and Optoma GT2000HDR (0.50:1) are the workhorses here. A short-throw projector sits on the ceiling between the hitting area and the screen, usually 5 to 8 feet from the screen. The lens is close enough to the impact zone that your body does not block the image, but far enough back to give you a clean installation.

Standard-throw: Throw ratio 1.15:1 and up. These require the projector to sit at the back of the room, 10 to 15 feet from the screen. In a golf simulator with a wide screen, the projector ends up behind the hitting area. Your body casts a shadow on the screen during the backswing and follow-through. Standard-throw projectors work only in rooms with excessive depth (18+ feet) where you can mount the projector well behind the hitting position, or where you use a very tall ceiling and ceiling mount to get the projector above your head.

The Shadow Problem Explained

This is the thing most first-time builders do not anticipate. You stand between the projector and the screen. If the projector lens is anywhere near the same vertical plane as your body, your silhouette lands on the screen.

A standard-throw projector mounted 12 feet from the screen usually sits in the same 6-foot zone your body occupies when you swing. Every time you take a backswing, your shoulder and right arm block the lower-left quadrant of the image. Every time you follow through, your body blocks the center. It is infuriating and there is no software fix for it.

Short-throw projectors solve this because they are positioned between the hitting area and the screen, not behind it. The projector is ahead of you. Your body is behind the light cone. No shadow.

Ultra-short-throw projectors solve this by being so close to the screen that the light cone spreads outward at an extreme angle. You would have to stand directly in front of the lens to cast a shadow, which would mean standing inside the screen.

If you are building a golf simulator in any room under 18 feet deep, you need a short-throw or ultra-short-throw projector. Period.

The Formula: How to Calculate Your Required Throw Distance

Here is the math you need. Write this down.

Step 1: Measure your screen width in feet. Not the diagonal. Not the height. The width. A typical 4:3 golf simulator screen that is 10 feet wide by 8.5 feet tall – the width is 10 feet.

Step 2: Find the throw ratio of your projector. This is published in the specs as a single number (0.69:1) or a range (0.69-0.83:1) if the projector has optical zoom.

Step 3: Multiply screen width by throw ratio.

Distance = Screen Width x Throw Ratio

Example: 10-foot-wide screen, BenQ AK700ST with throw ratio 0.69:1 at wide angle.

Distance = 10 x 0.69 = 6.9 feet

The lens needs to be 6.9 feet from the screen to produce a 10-foot-wide image.

Step 4: If the projector has a zoom range, do the calculation at both ends to find your mounting range.

AK700ST with 0.69-0.83:1 zoom range:

• Wide (0.69): 10 x 0.69 = 6.9 feet minimum
• Tele (0.83): 10 x 0.83 = 8.3 feet maximum

Your lens must be mounted somewhere between 6.9 and 8.3 feet from the screen. That 1.4 feet of wiggle room lets you fine-tune the image size by zooming rather than moving the mount.

Throw Distance Tables for Every Common Screen Size

These tables assume the projector is at wide angle (shortest throw). If your projector has zoom, add 15-20 percent to the distance for the telephoto end.

Ultra-Short-Throw (0.25:1, e.g. Optoma GT1090HDR)

Short-Throw (0.50:1, e.g. Optoma GT2000HDR)

Short-Throw with Zoom (0.69-0.83:1, e.g. BenQ AK700ST, TH671ST)

Medium-Throw (1.20:1, e.g. budget home theater projectors)

Standard-Throw (1.50:1, e.g. typical office/classroom projector)

Notice something? A standard-throw 1.50:1 projector needs 15 feet of room depth just to fill a 10-foot-wide screen. That is before you account for the distance behind the projector for cables, the distance from the screen to the wall, and the fact that your hitting area is usually 8 to 10 feet from the screen. In a 20-foot-deep room, you might make it work with careful mounting. In a 12 to 14-foot-deep garage, you cannot. This is why short-throw projectors dominate the golf sim market and standard-throw projectors are the #1 cause of “my image is too small” posts on golf sim forums.

Lens Shift versus Keystone: Do Not Confuse These

Lens shift is a physical adjustment that moves the image up, down, left, or right by shifting the lens elements inside the projector. It does not distort the image. It does not create artifacts. It is the correct way to position your image on the screen.

Keystone correction is a digital adjustment that squishes the image to compensate for an angled projector. It destroys image quality, creates pixel artifacts, and introduces input lag. Keystone is for boardroom presentations where nobody cares about image quality. It is not for golf simulators where you are trying to read spin numbers at 120 frames per second.

If your projector does not have vertical lens shift, you need to physically tilt the projector downward to hit a screen that is mounted below the projector’s natural image center. That tilt creates keystone distortion. Some projectors have auto-keystone that constantly adjusts, but that introduces enough processing lag to be noticeable in a golf sim.

The fix: buy a projector with vertical lens shift. Or mount the projector at exactly the right height so the lens center aligns with the top third of the screen (the typical offset required by most projectors).

Most short-throw gaming projectors like the BenQ AK700ST do not have lens shift. That is by design – the short throw angle means the image naturally hits a surface close to the projector’s vertical plane. You mount the projector at the right height, not adjusted afterward.

If you need lens shift, you are looking at premium models like the Epson LS800 (UST with built-in image placement flexibility) or higher-end Panasonic and Sony projectors that cost more than most golf simulator builds. The practical answer for most builders: mount the projector at the correct height the first time and do not rely on digital correction.

Mounting Position: Ceiling, Shelf, or Floor

Where you put the projector depends on the throw category and your room layout.

Ceiling Mount (Short-Throw)

This is the standard installation for 90 percent of golf simulators. The projector mounts on the ceiling between the hitting area and the screen. The lens points downward and backward at an angle to hit the screen surface.

Key measurements for ceiling mounting:

• Lens height: The center of the lens should be at or slightly above the top edge of the screen. If your screen is 9 feet tall and mounted with the top at 8 feet above the floor, your lens center should be around 8 feet above the floor.
• Distance from screen: From the table above, based on your screen width and projector throw ratio.
• Distance from hitting area: The projector mount must be close enough to the screen to fit between the hitting area and the screen. With a short-throw projector at 5 to 8 feet from the screen, and the hitting area at 8 to 10 feet from the screen, the projector sits roughly 2 to 4 feet in front of the hitting mat. That is ideal. You are between the projector lens and the screen. Your body casts no shadow.

Ceiling mount tip: Use a quick-release mount plate. You will need to access the projector for adjustments, cable management, and the occasional bulb replacement. A mount with a sliding plate lets you disconnect the projector body from the ceiling plate without unscrewing four bolts while balancing on a ladder.

Shelf Mount (Ultra-Short-Throw)

UST projectors for golf simulators typically sit on a low shelf or cabinet directly below the screen. The Optoma GT1090HDR is the standard example. It sits on a shelf 12 to 24 inches above the floor, pointing upward at the screen from inches away.

The advantage: zero shadow risk, no ceiling mount required, easy access for adjustments. The disadvantage: the space below your screen is occupied by a projector and shelf. If your enclosure has a low-profile screen that comes close to the floor, you might not have room for a UST shelf mount.

Floor Mount / Stand (UST or Short-Throw)

Some builders use a floor stand behind the hitting area. This works if the projector has enough throw range to fill the screen from 12 to 15 feet back. It avoids ceiling work entirely. The trade-off is that the projector sits on the floor behind the hitting mat, which means it can get hit by ricochets, stepped on, or kicked.

Do not use a standard tripod projector stand. They are not stable enough for a room where people swing golf clubs. Get a weighted AV cart or a purpose-built projector floor stand with a wide base.

Vertical Image Offset: The Spec Nobody Talks About

Here is the spec that trips up more builders than throw ratio.

When a projector is mounted on the ceiling and pointed at a screen, the image does not necessarily appear directly in front of the lens. Most projectors have an offset that shifts the image above or below the lens centerline.

For ceiling-mounted short-throw projectors, the image typically projects slightly above the lens center. This is the intended design – you mount the projector at the top of the screen area, and the image drops down to fill the screen.

The BenQ AK700ST has a 100 percent vertical offset. That means the bottom of the image is exactly at the centerline of the lens. If the lens is 8 feet above the floor, the bottom of the image is at 8 feet, and the top of the image is at 8 feet plus the image height. For a 10-foot-wide 4:3 screen (8.5 feet tall), the top of the image would be at 16.5 feet – meaning the image extends far above the lens. This is the correct behavior for a ceiling-mounted projector aimed downward.

Wait. That does not sound right for a golf sim, does it? Let me clarify.

The 100 percent offset on gaming short-throw projectors means the image projects upward from the lens center when the projector is table-mounted (sitting on a desk). When ceiling-mounted (upside-down), the same offset means the image projects downward from the lens center.

The practical takeaway: short-throw gaming projectors are designed to be ceiling-mounted above the top of the screen. When you flip the projector upside down for ceiling mounting, you also need to enable the “ceiling mount” setting in the projector menu. This flips the image orientation and adjusts the offset direction so the image projects downward onto the screen.

Your specific projector will have published offset specs. Look for them in the manual. If you cannot find them, assume the image starts at the lens centerline and extends upward (table mount) or downward (ceiling mount) by the image height. Mount accordingly.

The Perfect Mounting Height Formula

For a ceiling-mounted short-throw projector:

1. Determine the screen height. A typical 10-foot-wide 4:3 screen is 8.5 feet tall (measured diagonally, these are actually close to 4:3 ratio screens that are 8 ft tall or so).

Actually, let me give you exact numbers for the most common golf simulator screen sizes:

10 ft wide x 7.5 ft tall (4:3): Mount the lens center at 7.5 feet above the floor (ceiling mount). The image will project downward to cover the full screen from floor to top.

9 ft wide x 6.75 ft tall (4:3): Mount the lens center at 6.75 feet above the floor.

8 ft wide x 6 ft tall (4:3): Mount the lens center at 6 feet above the floor.

10 ft wide x 8.5 ft tall (16:9 widescreen): Mount the lens center at 8.5 feet above the floor.

The formula is simple: the lens center height equals the screen height. That puts the image range from floor to full height.

But here is the problem: most residential rooms have 9 to 10-foot ceilings. Mounting a projector at 7.5 or 8.5 feet above the floor means the projector body is inches below the ceiling. That works fine in most rooms. But if your ceiling is 9 feet and your screen is 10 feet wide by 8.5 feet tall, the lens center needs to be at 8.5 feet, leaving you only 6 inches between the projector body and the ceiling. That is tight.

The solution: use a low-profile ceiling mount. Standard projector ceiling mounts drop 6 to 10 inches below the ceiling. A low-profile mount drops 2 to 4 inches. That extra few inches can make the difference between a mount that fits and one that sticks out like a sore thumb.

Projector Recommendations by Throw Category

These are the projectors I have seen work consistently in golf simulators, with their actual throw specs.

Ultra-Short-Throw (Best for tight rooms, no ceiling mount)

Optoma GT1090HDR — Throw ratio 0.25:1

• 2.5 feet from lens to screen for a 10-foot-wide image
• 1080p, 4200 lumens
• Sits on a shelf below the screen
• You need enough clearance between the floor and the bottom of your enclosure screen to place a projector shelf
• No ceiling work required
• Best for rooms where you cannot or will not mount a projector on the ceiling

Epson LS800 — Throw ratio 0.25:1 (with lens shift)

• 2.5 feet from lens to screen for a 10-foot-wide image
• 4K, 4000 lumens
• Has lens shift for fine image positioning
• Three times the cost of the Optoma GT1090HDR
• Best if you need 4K resolution and have the budget

Short-Throw with Zoom (The Standard Recommendation)

BenQ AK700ST — Throw ratio 0.69-0.83:1

• 6.9 to 8.3 feet from lens to screen for a 10-foot-wide image
• 4K, 3000 lumens
• 1.2x optical zoom for fine image sizing
• 100 percent offset (correct ceiling mount behavior)
• The most popular dedicated golf simulator projector on the market
• Ceiling mount between hitting area and screen
• Full review on this site

BenQ TH671ST — Throw ratio 0.69-0.83:1

• Same throw as AK700ST (identical optics)
• 1080p, 3000 lumens
• Under $500
• The budget option for 1080p builds
• Same mounting position as AK700ST
• If you play at 1080p or use a launch monitor that outputs at 1080p, you will not see a difference from the AK700ST

Optoma GT2000HDR — Throw ratio 0.50:1

• 5.0 feet from lens to screen for a 10-foot-wide image
• 1080p, 4000 lumens
• Ultra-short throw in a short-throw price range
• Mounts closer to the screen than the BenQ options
• Good for rooms where you want the projector closer to the screen to avoid any risk of interference with the hitting area

Standard-Throw (Only for Rooms with 18+ Feet of Depth)

I do not recommend standard-throw projectors for golf simulators unless you have a very deep room and can mount the projector behind and above the hitting area. If you must use one:

Epson Home Cinema 3800 — Throw ratio 1.33-2.16:1

• 13.3 to 21.6 feet for a 10-foot-wide image
• 4K, 3000 lumens
• Has lens shift (rare in this price range)
• Works only in rooms 20 feet deep or deeper
• Mount behind the hitting area, well above head height

BenQ TK700STi — Throw ratio 0.9-1.08:1

• 9.0 to 10.8 feet for a 10-foot-wide image
• This is technically a medium-throw, not standard-throw
• 4K, 3200 lumens
• The bare minimum throw distance I would recommend for a golf simulator with a 10-foot screen
• Mount at 9 feet from the screen, which places it just ahead of the hitting area

Common Mistakes and How to Avoid Them

Mistake 1: Buying a Home Theater Projector

Home theater projectors have long throw ratios (typically 1.15:1 to 2.0:1) because they are designed for rooms where the projector sits at the back. In a golf sim, this puts the projector behind you. Shadow city.

The fix: Buy a short-throw gaming projector, not a home theater projector. Look for “short throw” or “gaming” in the product name.

Mistake 2: Not Accounting for Offset

You mount the projector on the ceiling, turn it on, and the image is either on the ceiling above the screen or on the floor below it. That is an offset problem, not a distance problem.

The fix: Read the offset spec before mounting. Enable “ceiling mount” mode in the projector menu. Mount the projector at the height calculated above.

Mistake 3: Relying on Digital Zoom or Keystone

Digital zoom crops the image, reducing resolution. Keystone distorts the image and adds lag. Neither is acceptable in a golf sim.

The fix: Get the physical positioning right. Use optical zoom for fine-tuning. If the image is too big, move the projector closer. If too small, move it back. Do not rely on digital corrections.

Mistake 4: Mounting Before Testing

You punch a hole in the ceiling, run HDMI, bolt the mount plate, attach the projector, and then find out the image is wrong.

The fix: Test the projector position before you mount anything. Set the projector on a ladder, a stack of boxes, or a table at the estimated position. Turn it on. Measure the image. Adjust. Only when the image is the right size at the right position should you commit to the mount.

Mistake 5: Forgetting Cable Routing

Your HDMI cable, power cable, and any control cables need to run from the projector to your PC or AV receiver. Ceiling-mounted projectors need these cables run through the ceiling, down the wall, and to the equipment rack.

The fix: Plan cable routes before mounting. Use a recessed cable plate or a low-voltage bracket behind the projector. Run HDMI 2.1 rated cables rated for in-wall use (CL2/CL3 rated). Leave enough slack for the projector mount to tilt and swivel without pulling the cables tight.

Mistake 6: Underestimating Screen Reflectivity at Short Throw Distances

Short-throw projectors hit the screen at a wider angle than standard-throw projectors. Some projector screen materials (especially cheaper ones designed for rear projection or standard-throw setups) reflect light unevenly at short throw angles, creating hot spots or dark bands.

The fix: Use a screen material designed for front projection at short throw distances. Standard golf simulator impact screens from Carl’s Place, Par2Pro, and similar vendors are all designed for this. If you are using a DIY screen material (like blackout cloth), test it with your specific projector before committing.

Room Depth Summary

Before you buy any projector, measure your room depth from the screen wall to the back wall. Subtract the space your enclosure takes up (typically 6 to 12 inches behind the screen for the frame and padding). That gives you the maximum available throw distance.

• Under 10 feet deep: Ultra-short-throw only (Optoma GT1090HDR or similar 0.25:1 throw ratio)
• 10 to 12 feet deep: Ultra-short-throw or short-throw at the wide end (Optoma GT2000HDR at 0.50:1)
• 12 to 15 feet deep: Short-throw (BenQ AK700ST, TH671ST, or Optoma GT2000HDR)
• 15 to 18 feet deep: Short-throw with zoom or medium-throw
• 18+ feet deep: Any category, including standard-throw, mounted behind the hitting area

What You Actually Need to Buy

Here is my recommendation list by setup type.

Budget 1080p Build ($400-$500)

• BenQ TH671ST ($400-$500)
• Ceiling mount with low-profile plate ($20-$40)
• 50-foot HDMI 2.0 cable ($15-$25)
• Throw distance: 6.9 feet for a 10-foot-wide screen

Standard 4K Build ($1,000-$1,300)

• BenQ AK700ST ($1,000-$1,200)
• Low-profile ceiling mount ($30-$50)
• 50-foot HDMI 2.1 cable ($25-$40)
• Throw distance: 6.9 to 8.3 feet for a 10-foot-wide screen (adjust with zoom)

No-Ceiling-Mount Build / Ultra-Tight Room ($700-$1,200)

• Optoma GT1090HDR ($700-$900)
• Low shelf or AV cabinet ($50-$150)
• 6-foot HDMI 2.0 cable ($10-$15)
• Throw distance: 2.5 feet for a 10-foot-wide screen (shelf below screen)

Premium 4K Build ($2,500-$3,500)

• Epson LS800 ($2,500-$3,000)
• Low shelf with vibration isolation ($100-$200)
• 6-foot HDMI 2.1 cable ($10-$15)
• Throw distance: 2.5 feet for a 10-foot-wide screen
• Lens shift for precise image placement

Related Guides

• Best 4K Projectors for Golf Simulators — Full reviews of every projector worth buying
• Best BenQ Projector for Golf Simulator — AK700ST deep dive with installation photos
• Minimum Ceiling Height for Golf Simulator — Room height requirements that affect projector placement
• Golf Simulator Screen Guide — Screen materials, sizes, and reflectivity
• Golf Simulator Man Cave Ideas — Light control for better image quality
• How to Install a Golf Simulator Enclosure — Complete enclosure installation
• Golf Simulator Space Requirements — Room dimensions for every setup type
• Will It Fit Tool — Check if your room is big enough