Projector lens throw & brightness calculator

Pick a projector and lens to see the required throw distance for a given screen size (or the reverse), plus the resulting screen brightness.

Projector

Lens

Solve for

Screen diagonal

Width — · Height —

Zoom position — —

WIDE TELE

Closer = wide end of zoom · Farther = tele end of zoom

Result at this zoom position

Screen diagonal

—

Screen width

—

Screen height

—

Throw distance

—

Pixel density

—

The image is in focus anywhere between the closest and farthest distances shown below — that’s what those numbers mean. Pixel density is a separate thing: it’s how visible individual pixels are up close. Lower PPI can *look* soft even when the lens is perfectly focused, similar to how a phone photo looks fine on the phone but pixelated blown up on a billboard.

Full zoom range for this screen size

Closest (wide zoom)

—

Farthest (tele zoom)

—

Setup diagram

Left: top-down view — how far back the projector sits. Right: screen face-on — width and height.

Screen brightness

Light output — —

Of the projector’s rated lumens (accounts for eco mode / lamp aging)

Screen gain

gain

1.0 = standard matte white screen

Screen brightness

—

Rating

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0 fL12–22 dark room50 fL bright room80 fL