How far should you sit from a projector screen?

Apply the same THX and SMPTE viewing angle standards as for a TV. For a 100-inch projected screen, the THX 36-degree distance is 10.5 feet and the SMPTE 30-degree comfortable distance is 12.8 feet. For a 120-inch screen those figures are 12.6 and 15.3 feet. Sit within this range for the best picture experience.

What is throw ratio on a projector?

Throw ratio is the distance from the projector lens to the screen divided by the width of the projected image. A throw ratio of 1.5 means the projector must be placed 1.5 feet from the screen for every 1 foot of image width. A standard 1.0 throw ratio projector placed 8 feet from the screen produces an 8-foot-wide (96-inch diagonal) image. Short-throw projectors have ratios below 0.5 and can produce large images from very close to the screen.

Projector Viewing Distance: Throw Ratio & Screen Size Guide (2026)

Projector Guide · 2026

Projector Viewing Distance: Throw Ratio & Screen Size

Projectors involve two distance questions: how far the projector sits from the screen (throw distance), and how far viewers sit from the screen (viewing distance). Here is how to calculate both.

🎬 Throw ratio explained📐 Screen size by viewing distance📺 Short-throw vs standard

Two Distances

Throw distance vs viewing distance

A projector setup involves two distinct distance calculations. Throw distance is how far the projector sits from the screen surface and determines image size. Viewing distance is how far the audience sits from the screen and determines the correct screen size for a good picture.

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Throw distance (projector to screen)

Controlled by the projector throw ratio and the desired screen size. You calculate this when placing the projector. Formula: throw distance = throw ratio × screen width.

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Viewing distance (audience to screen)

Controlled by room layout and screen size. Same THX and SMPTE standards as a TV apply here. Calculate this to determine what screen size you need for your room.

Throw Ratio

What throw ratio means and how to use it

Every projector has a throw ratio specification. It is the ratio of throw distance to image width. A 1.5 throw ratio means you need 1.5 feet of distance for every 1 foot of image width.

Projector Type	Throw Ratio	Distance for 100" screen	Distance for 120" screen
Ultra short-throw	0.2–0.4	0.7–1.4 ft	0.8–1.7 ft
Short-throw	0.4–0.8	1.4–2.8 ft	1.7–3.4 ft
Standard throw	1.0–2.0	3.5–7 ft	4.2–8.4 ft
Long throw	2.0–3.0	7–10.5 ft	8.4–12.6 ft

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How to calculate: Find the throw ratio in your projector's specs. Multiply by the desired screen width in feet. A 100-inch 16:9 screen is 87 inches (7.2 feet) wide. A projector with a 1.2 throw ratio needs 7.2 × 1.2 = 8.6 feet of throw distance. If your room gives you 9 feet between the projector position and the screen, this projector works.

Viewing Distance Table

How far to sit from a projected screen

The THX and SMPTE angle standards apply exactly the same way for a projected screen as for a TV. The screen size is the only input. Here are the ideal viewing distances for the most common projector screen sizes.

Screen Size	Screen Width	THX Distance (36°)	SMPTE Distance (30°)	Casual Max
80"	69.7"	8.4 ft	10.2 ft	15 ft
90"	78.4"	9.5 ft	11.5 ft	17 ft
100"	87.2"	10.5 ft	12.8 ft	19 ft
110"	95.9"	11.6 ft	14.0 ft	21 ft
120"	104.6"	12.6 ft	15.3 ft	23 ft
135"	117.7"	14.2 ft	17.2 ft	26 ft
150"	130.7"	15.8 ft	19.1 ft	29 ft

A 100-inch projected screen with primary seating at 12 to 13 feet delivers a SMPTE-reference picture experience, comparable to a 65-inch TV at 8 feet. For most home theater rooms with 10 to 14 feet of seating distance, a 100 to 120-inch screen is the practical sweet spot.

Recommended projectors and screens coming soon.

Plan your projector setup

Use the calculator to find the right screen size for your viewing distance.

Open Calculator Screen Size Guide

FAQ

Common questions: projector viewing distance

Yes, at the same rate as sitting too close to a TV. At the THX 36-degree standard for a 100-inch screen you are at 10.5 feet — below that the screen starts to feel overwhelming for passive viewing. For gaming or immersive use, sitting at or slightly inside THX distance is intentional. For long movie sessions, the SMPTE 30-degree distance of 12.8 feet is more comfortable.

In a 12-foot room where your seating is at 10 to 11 feet from the screen wall, a 100 to 110-inch screen puts you at the THX to SMPTE reference range. At 10.5 feet a 100-inch screen hits exactly 36 degrees (THX). At 11 feet a 110-inch screen delivers 35 degrees. Both are ideal for home cinema use.

Short-throw projectors (0.4 to 0.8 throw ratio) are better for living rooms where the projector cannot be ceiling-mounted far back from the screen. A short-throw model placed on a TV unit 3 to 5 feet from the screen can produce a 90 to 120-inch image. Standard-throw projectors need 8 to 12 feet of clear space between the projector and screen, which requires ceiling mounting in most living rooms. Ultra short-throw laser projectors sit directly under the screen and are the most practical option for permanent living room installations.