What a 1.2:1 throw ratio means for projector distance and placement

What does projector throw ratio measure?

Projector throw ratio compares two lengths: the distance from the projector's lens to the image surface, and the width of the image it throws. BenQ's ceiling-mount placement guide gives the formula as projection distance divided by screen width, and measures that distance from the very front of the lens, not from the ceiling-mount axis. AVIXA's short-throw guide states the same relationship as "Throw Ratio = Throw Distance / Image Width".

A lower throw ratio puts a given image width closer to the wall; a higher ratio needs more room. At 1.2:1 (often written simply as a 1.2 throw ratio), a one-metre-wide image needs the lens about 1.2 metres away. The throw ratio says nothing about how high the image lands or whether anything stands in the beam. BenQ's worked examples use its own X3000i projector, which has a typical throw ratio of 1.15–1.50, so only the formula carries over to other models.

A throw ratio can be quoted as a range. BenQ's throw-ratio explainer notes that "some projector lens specs will provide two different throw ratios, one that specifies the distance without adjusting the zoom and one that provides the minimum and maximum zoom settings." Each Neon+ product page lists a single throw ratio.

How do you calculate throw distance for a 1.2:1 throw ratio?

Throw distance at a 1.2:1 throw ratio is the image width multiplied by 1.2, measured from the front of the lens. A 1.5-metre-wide image needs about 1.8 metres, and a 2.5-metre-wide image needs about 3.0 metres. The rule works in any unit as long as width and distance use the same one: a 6-foot-wide image needs about 7.2 feet.

BenQ's explainer states the same rule for another ratio: at 2.0, "for every 1ft of image width, the projector needs to be 2ft away."

When the room is fixed, run the formula backwards: divide the free distance by 1.2 to find the widest image that fits. A classroom with 3.0 metres clear in front of the wall fits an image about 2.5 metres wide at 1.2:1.

Why must the calculation use image width instead of diagonal size?

Screens are sold by diagonal, but the throw-ratio formula needs width. A diagonal is always longer than the width, so feeding it in pushes the projector too far back. A 100-inch 16:9 image is 2.54 m corner to corner but about 2.21 m wide: the correct distance at 1.2:1 is about 2.66 m, while the diagonal would suggest 3.05 m, roughly 40 cm too far.

The same diagonal gives a narrower image as the shape gets squarer, so the aspect ratio changes the distance too. Neon+ lists a native resolution of 1280 × 800 for the V6 and V8, a 16:10 shape, so the 16:10 column applies when they project at that native shape. The simplest check needs no conversion at all: mark the image edges on the wall and measure between them with a tape measure.

Is a 1.2:1 throw ratio short throw?

No. A 1.2:1 throw ratio falls in the gap between AVIXA's bands: above short throw, which runs from 0.4:1 to 1.0:1, and below where standard throw generally begins, at 1.5:1. For the same image width, a 1.2:1 projector needs 20% more distance than a 1.0:1 model and 20% less than a 1.5:1 model, so check the room before assuming it will fit.

In AVIXA's guide to short throw ratio for AV/IT professionals (Pamela Winikoff, 14 May 2025), short throw "[t]ypically ranges from 0.4:1 to 1.0:1 (i.e., 0.4 to 1 meter for every meter of image width)", while standard throw "[r]equires more distance between the projector and screen, generally 1.5:1 or higher." Ultra-short throw is "Less than 0.4:1".

Each figure above is the lens-to-screen distance for the same 2.0-metre-wide image, so a 1.2:1 projector needs 40 cm more room than a 1.0:1 short-throw model and 60 cm less than a 1.5:1 standard-throw model.

What room constraints can change projector placement?

The throw-ratio calculation settles one horizontal distance. It does not decide whether the projector can actually stand or hang there. BenQ's guide asks for accurate room measurements first, including ceiling height and the objects that may get in the way, and treats lens offset as a separate calculation. Check every item below at the calculated spot.

Height

Where the top and bottom edges of the image land on the wall.

Offset

How far the image sits above or below the lens.

Surface

A stable table, stand or mount at the calculated spot.

Furniture

Desks, cabinets or people standing in the beam.

Doors

Doorways and walkways crossing the line from lens to wall.

Ceiling

Fans, lights and air-conditioning units in the way.

Cables

A safe route for the power and signal cables.

Test image

Project, focus and measure the actual image width, after any keystone correction, before fixing the position.

For a classroom, the classroom projector setup guide walks through stable placement, the power route and the source connection in order, and the classroom projector setup checklist repeats the checks before each lesson. For a permanent wall or ceiling fixing, follow the exact model's manual and use a suitably qualified installer.

Which Neon+ projectors have a 1.2:1 throw ratio?

Five Neon+ projectors list a 1.2:1 throw ratio on their product pages: the K5, V8, V6, X5 and X5 Plus. The C2000 lists 1.07:1 and the Q1 lists 1.4:1. The table gives each model's distance for the same 2.0-metre-wide image, so the ratios compare directly: the C2000 sits about 26 cm closer than a 1.2:1 model and the Q1 about 40 cm further back.

Neon+'s published image sizes at 1 metre are consistent with its published throw ratios, as the V6's figures show:

Throw ratio

1.2:1

Published reference

39-inch image at 1 metre

Width of a 39-inch image

about 0.84–0.86 m

Width × 1.2

about 1.0 m, matching the published 1 metre

A 39-inch diagonal is 0.99 m corner to corner: about 0.84 m wide at the V6 and V8's native 16:10 shape, or 0.86 m at 16:9. The 1-metre figures still differ slightly between models that share 1.2:1, from 37.4 to 39 inches, so treat each as that model's own figure and measure the real image on site. Compare the full range on the Neon+ smart projector page.