Video

Projector throw distance

Throw ratio + image width → required projector mount distance.

Find the throw ratio on the projector datasheet — usually a range like 1.2:1 – 1.8:1 for zoom lenses, or a single value for fixed lenses. Enter the desired image width and we'll show where the projector lens needs to sit.

Mode

inputs

Distance unit

Desired image widthm

Throw ratio — min (wide)

From the projector datasheet. For a fixed lens, set min = max.

Throw ratio — max (tele)

lens must sit between

3.60 – 4.80m

for a 3 m image at throw 1.2:1 – 1.6:1

Measure from the front of the projector lens to the screen surface. Many projectors also have vertical lens shift — that doesn't change throw distance, just where the image lands.

placement (top view)

Looking down at the room. The lime band is the valid lens position for the chosen image width — anywhere along it produces the right size.

Need this math wired into a real system? We do that for a living.

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