Visible image dimensions
A 100-inch 16:9 image is about 87.2 inches (221.4 cm) wide by 49.0 inches (124.5 cm) high. A 120-inch 16:9 image is about 104.6 inches (265.7 cm) wide by 58.8 inches (149.4 cm) high. The cassette and black borders add more width and height beyond the visible image.
Why 120 inches changes the room
The extra image area is substantial, but so is the installation footprint. A 120-inch screen can conflict with tower speakers, doors, wall sconces or cabinetry that a 100-inch screen clears comfortably. Measure the complete product dimensions, not just the diagonal.
UST projector placement can change too
With UST projectors, image size often changes the required projector-to-wall and projector height relationship. Before selecting the larger screen, use the projector manufacturer's placement chart and make sure the furniture depth can support the required position.
Choose immersion after fit
If both sizes fit cleanly, the larger image is naturally more immersive. But a slightly smaller screen that aligns correctly, avoids obstructions and keeps the projector stable is better than a larger screen that forces a compromised geometry.
Frequently asked questions
How much larger is a 120-inch image than 100-inch?
At the same 16:9 ratio, it has about 44% more image area.
Do these dimensions include the cassette?
No. They describe the visible 16:9 image only; product housing and borders add size.
Should I always buy the largest screen that fits?
No. Projector placement, seating distance, speakers and room layout all matter.
Research note
Product-specific facts on this page were checked against the NothingProjector product listing and related manufacturer listings on September 16, 2026. Where we discuss fit, trade-offs or room design, that is editorial analysis rather than a claim of hands-on testing. Live merchant details can change.