Projector lumens calculator
Enter your screen size and room lighting to get the recommended projector lumens (ANSI). Free calculator with a screen-size-to-lumens reference table.
Needed lumens scale with screen area and how much light you’re fighting. A 100-inch screen wants roughly 450 ANSI lumens in a dark room, about 900 in a dim room and around 1,500 in a bright room. Pick your size and lighting below for the exact target.
Recommended lumens by screen size
| Screen | Dark | Dim | Bright |
|---|---|---|---|
| 80″ | 300 | 550 | 950 |
| 100″ | 450 | 900 | 1,500 |
| 120″ | 700 | 1,300 | 2,150 |
| 150″ | 1,050 | 2,000 | 3,350 |
How the lumens target works
On-screen brightness is measured in foot-lamberts (fL): about 16 fL is the cinema standard for a dark room, ~30 fL suits some ambient light and 50 fL+ fights a bright room. Because a bigger screen spreads the same light over more area, lumens needed rise with screen area, not diagonal — doubling the diagonal roughly quadruples the lumens. These targets assume a 1.0-gain white screen; a higher-gain or ALR screen lets you get away with fewer lumens.
Not sure what screen size fits your room? Use the screen size calculator. →
How many lumens do you need?
Use the ANSI (or ISO) lumen figure from the spec sheet — not “LED” or marketing lumens.
≈ 900 ANSI lumens