Guides · Updated September 27, 2026
How to Choose a Home Projector
A projector is chosen by three numbers: how bright it is, how far it sits from the screen, and how sharp the image is. Nail all three and the room takes care of the rest.
Brightness: how many lumens
A dark, light-controlled room needs 1,500–2,500 ANSI lumens for a 100–120″ screen. A room with some ambient light needs 3,000+ lumens. The projector brightness calculator turns your screen size and room light into an exact figure.
Throw ratio: where it sits
Throw ratio is distance ÷ screen width. A 1.5–2.0 ratio is standard for a projector mounted 3–4 m (9.8–13 ft) from a 2 m (6.6 ft) wide screen. Check that your chosen projector fits your room before buying — the throw distance calculator works it out in seconds.
Resolution and light source
4K is now standard for home theater; 1080p is fine on a budget or for casual use. Laser light sources last about 20,000 hours with no lamp swaps; lamps are cheaper up front but dim over roughly 3,000–5,000 hours.
Frequently asked questions
How many lumens do I need for a 120 inch screen?
Around 2,000–2,500 in a dark room, 3,000+ with ambient light. Enter your screen size and room light in the projector brightness calculator for the exact number.
Can any projector mount at any distance?
No — each projector has a throw-ratio range. Use the throw distance calculator to confirm the projector covers your screen from your planned mounting point.