ThrowFit
Open calculator

Large-screen room fit

Projector distance for a 120-inch screen

Use the real image width of a 120-inch 16:9 screen instead of multiplying throw ratio by the diagonal.

Local geometry

Projector fit

No model lookup
Projected image aspect ratio
Known screen
Projector throw-ratio range
Use the same value for a fixed lens.

Measure from the lens reference point to the image surface. Body depth, cables, zoom limits, lens shift, offset, focus, brightness, keystone, mounts, and tolerances are outside this geometry.

Calculated geometry

Lens-distance range

Place the lens within≈ 3.19–3.98 m
Lens distance≈ 3.19–3.98 m10.46–13.07 ft
Image diagonal120 in304.8 cm
Image width≈ 104.59 in265.66 cm
Image height≈ 58.83 in149.43 cm
Throw ratio1.2–1.5

D = W × r = 104.59 × 1.2–1.5

The aspect-ratio diagonal usually introduces a square root. ThrowFit keeps exact decimal inputs and unit conversions, then marks rounded display values with ≈.

Verify the final range, reference point, focus limits, and mounting clearance in the current manual for the exact projector and lens.