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100” vs 120” TV

How the 100-inch and 120-inch sizes really compare — dimensions, ideal seating distance and how much extra screen you actually get.

100” 120”
100”
87.2×49” · sit 10–13.3 ft
vs
120”
104.6×58.8” · sit 12–16 ft
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Side-by-side specs

Diagonal100” vs 120” (+20”)
Screen width (16:9)87.2” vs 104.6”
Screen height (16:9)49” vs 58.8”
Relative picture area120” is ~44% bigger (1.44×)
Immersive distance (THX 40°)10 ft vs 12 ft
Relaxed distance (SMPTE 30°)13.3 ft vs 16 ft
Rule of thumb: screen area — not the diagonal number — is what your eyes notice. Jumping from 100” to 120” adds about 44% more picture.

TV wall mounts

A good mount puts the screen at the right height and lets you angle it away from glare. Match the mount's VESA pattern and weight rating to your TV, and use full-motion arms for wide or off-center rooms.

Full-motion (articulating) mountSwivel & tilt — best for corner or wide seatingLink coming soon
Tilting low-profile mountSits flush — ideal for above-eye-level placementLink coming soon
Fixed ultra-slim mountCheapest, thinnest — for perfectly-placed screensLink coming soon

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📐 Viewing Distance Calculator

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Frequently asked questions

Is a 120 inch TV much bigger than a 100 inch?

Yes. Diagonally it's 20” larger, but because screen area grows with the square of the diagonal, the 120” picture is about 44% bigger (1.44× the area) than the 100”. Side by side the difference is very noticeable.

How much farther should I sit from a 120 inch than a 100 inch TV?

For the same immersive THX view, plan about 10 ft for the 100” and 12 ft for the 120” — roughly 2 ft more.

Should I buy the 100 or the 120 inch TV?

If your seat is around 13.3–10 ft away, the 100” is comfortable; from 16 ft or more, step up to the 120”. When in doubt and the budget allows, most people prefer the larger screen — very few wish they'd bought smaller.

Will a 120 inch TV fit where a 100 inch was?

The 120” picture is about 104.6” wide vs 87.2” for the 100” — roughly 17.4” wider. Check your stand width and any recess before upgrading.

Compare other sizes

43” vs 50”43” vs 55”48” vs 55”50” vs 55”50” vs 60”55” vs 60”55” vs 65”55” vs 75”58” vs 65”60” vs 65”60” vs 70”65” vs 70”65” vs 75”65” vs 77”

Dimensions assume a 16:9 picture area. Distances use the THX (40°) and SMPTE (30°) standards. Last reviewed 2026-08-12.