MLS Maker Label Studio
Cited category: Digital, Data & AI

Projector Throw Distance Calculator

Plan AV projector placement from throw ratio, screen size, aspect ratio, and optional lens shift using the standard throw distance = screen width x throw ratio relationship.

Placement Inputs

Enter a single throw ratio or a projector zoom range. Screen width and throw distance use the same base unit.

Screen size basis

Results

Distances are calculated as screen width x throw ratio. Recommended mount distance is the selected point inside the throw range.

Throw distance range
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Enter valid inputs to calculate.
Recommended mount
Image dimensions
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Diagonal appears here.
Project
Projector placement install sheet
Screen
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Throw ratio
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Throw distance
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Mount distance
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Lens shift allowance
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Formula
Throw distance = screen width x throw ratio. Aspect math derives height and diagonal from 16:9, 16:10, or 4:3.
Verify the final mounting point against the projector manufacturer lens chart, physical lens offset, ceiling structure, keystone limits, and local installation requirements.

Self-Tests

Runs golden tests against the pure throw-distance and aspect-ratio calculation functions.

Self-tests: not run

About the Projector Throw Distance Calculator

Projector throw distance helps installers, AV managers, and home theater buyers turn a screen width and lens throw ratio into a workable mounting range. It checks image size, zoom limits, and room depth before hardware is drilled in place, so the chosen projector, screen, and ceiling mount can be specified with fewer site revisions.

How it works

  1. Enter the screen width or diagonal and choose the aspect ratio.
  2. Add the projector throw ratio or the minimum and maximum zoom range.
  3. Compare the calculated lens-to-screen distance with the available room depth.
  4. Use the mount notes to confirm lens position, offset, and service clearance.

Frequently asked questions

Where do I find a projector throw ratio?

Use the projector specification sheet or lens datasheet. A range such as 1.20 to 1.60 means the lens can create the same image width from several distances.

Is throw distance measured from the wall or from the lens?

Throw distance is measured from the projector lens to the screen plane. Wall thickness, screen frame depth, and mount plate setback should be added separately when laying out the room.

Why does zoom create a minimum and maximum mounting distance?

Optical zoom changes the image size at a fixed distance. The minimum throw is the closest lens position that still fills the screen, and the maximum throw is the farthest position within the lens range.

Does throw distance include lens shift or keystone correction?

No. Throw distance handles image size versus lens distance; lens shift and offset determine where the image lands vertically and horizontally.

Can I calculate distance from screen diagonal instead of width?

Yes, but the diagonal must be converted through the screen aspect ratio. A 100 inch 16:9 screen and a 100 inch 4:3 screen have different widths, so they need different throw distances.

References