Golf Impact Screen Projector Distance Calculator: The Exact Throw-Ratio Math (With a Free Tool)
Quick summary· AI-generated
The article breaks down the core formula (throw distance = throw ratio × screen width) that determines where a projector must sit relative to an impact screen in a golf simulator room. It walks through a real-world example using the BenQ TH671ST (0.69–0.83:1 ratio on a 10-foot screen = 6.9–8.3 feet mounting distance) and explains why short-throw projectors dominate home simulator builds. The piece includes an interactive calculator and notes that closer mounting trades off brightness pooling in the screen center—a key consideration for tight rooms.
Excerpt from GolfingSim - News
Here's a number that ends most projector-placement headaches before they start: a 0.69:1 projector on a 10-foot-wide screen sits exactly 6.9 feet from the fabric. Not "about 7." Not "somewhere back there." 6.9 feet — because throw distance is just throw ratio times screen width (Source: My Golf Simulator / Top Shelf Golf projector setup guides).
That single formula is the difference between a crisp, edge-to-edge image and a projector that either overshoots the screen or casts your backswing shadow across your ball flight. Below is the math, a worked example on a real projector, and a simple calculator so you can plug in your own room. No guesswork, no returns.
The one formula that runs your whole setup
Throw ratio is the spec printed on every projector's data sheet, and it's defined as throw distance ÷ screen width. Flip it around and you get the only equation you need:
Distance from lens to screen = Throw ratio × Screen width.
So a 0.83:1 projector on that same 10-foot screen? 8.3 feet back. A standard 1.1:1 office projector? 11 feet — which is usually behind your head and straight into shadow territory. This is why throw ratio, not brightness or resolution, is the first spec that decides whether a projector physically fits your golf room.
Golf Impact Screen Projector Distance Calculator
Type in your projector's throw ratio (from its spec sheet) and your screen's width. The calculator does the multiplication instantly and tells you whether you're inside the sim-friendly range.
Throw Distance Calculator
Throw ratio (e.g. 0.69)
Screen width (feet)
Calculate distance Your projector should sit 6.9 ft from the screen.
Inside the practical sim range (0.69–0.89:1). Good to go.
A worked example: the BenQ TH671ST
Let's run a real, popular golf-sim projector through it. The BenQ TH671ST carries a 0.69:1–0.83:1 throw ratio and can fill a 100-inch screen from roughly 5 feet away (Source: Carl's Place / Top Shelf Golf product specs).
On a 10-foot-wide impact screen, that same projector lands between 6.9 and 8.3 feet back — comfortably behind a normal hitting position and clear of your swing. That's exactly why short-throw units dominate this space. If you're weighing whether short-throw is right for your room in the first place, our guide on when close mounting is the right call walks through the trade-offs.
One caveat: the closer you mount, the more you fight brightness pooling in the center of the screen. If you've ever seen a bright blob in the…
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