Projector Brightness (Lumens) Calculator

Screen Size
Throw Distance
Viewing Distance
Brightness / Lumens
DIY Screen
Ceiling Mount

Use this to check whether your projector is bright enough for your screen size — especially important for living rooms with windows or outdoor movie nights.

How to use: Enter screen diagonal, choose how much ambient light you have, set screen gain (1.0 for a standard matte white screen), then click Calculate and compare the result with HAPPRUN models listed below.

Projector Brightness (Lumens) Calculator

Estimate how many ANSI lumens you need for your screen size and room lighting.

Screen diagonal (Inches)

Aspect ratio

16:9 4:3 21:9

Room lighting

Screen gain

1.0 = standard matte white

Screen preview

Required lumens and model fit will appear here.

HAPPRUN projectors for your setup

4K Smart Projector – 2000 ANSI Lumens, Google TV, Auto Focus, Dolby Audio, WiFi Bluetooth$399.00
Buy on Amazon
4K Smart Projector – 2000 ANSI Lumens, Google TV, Auto Focus, Dolby Audio, Adjustable 270° Stand$399.99
Buy on Amazon
Smart Projector – Netflix Licensed, 1500 ANSI, Auto Focus, WiFi 6, Bluetooth 5.2$99.00
Buy on Amazon

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