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Projector Brightness Calculator

Work out the lumens a projector needs for the screen size, the room light and what the audience is watching.

Projector Brightness Calculator

Work out the lumens a projector needs for the screen size, the room light and what the audience is watching.

Screen width (m)

Screen shape

Room light on the screen (lux)

Measure at the screen with the room set up as it will be used. A light meter, or a phone app for a rough figure, gives it.

What the audience is watching

Allowance for the projector dimming with age (%)

Results

Screen area: 3.52 m²

Contrast target: 15:1

Light needed on the screen: 2,100 lux

Projector brightness: at least 7,383 lumens

With the ageing allowance: 8,859 lumens

Contrast targets are the four ANSI/INFOCOMM 3M-2011 viewing categories. The sum assumes the projector's own black level is small next to the room light. An ambient-light-rejecting screen lowers the brightness you need.

Building a bigger job?Add these figures to a project, then add results from any of the other calculators. The project becomes one report you can save as a PDF and import again later to make changes.

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How it works

System contrast is the light from a white image plus the room light, divided by the room light alone. To reach a target ratio the projector must add (ratio - 1) x the room light, in lux, on the screen, and lumens are that lux x the screen area in square metres. The targets are the ANSI/INFOCOMM 3M-2011 categories: 7:1, 15:1, 50:1 and 80:1.

Need help designing a system? Talk to our team, or see all 41 free calculators.

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Teracom Solutions designs, supplies, installs and monitors CCTV, alarms, access control, intercoms, networks and AV for businesses. Send us your Projector Brightness Calculator results and we will quote the job, free.

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Projectors

Projectors for presentation, boardroom and home theatre applications.

Screens

Projector screens for presentations and home theatre, in the aspect ratio and gain suited to your space.

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