How to choose the size of a TV set

1080P vs 4K TV: Which to Choose? + Viewing Distance & Size Guide

When shopping for a new TV, one of the first decisions you need to make is: should you buy a 1080P TV or a 4K TV? These two resolutions are the most mainstream options on the market today. 

Of course, if you’re looking for an 8K TV (a premium choice for enthusiasts), that falls under a separate set of purchasing criteria.

Both 1080P and 4K are standard TV resolutions, and understanding the difference is key to a great viewing experience. In the TV industry, 1080P (Full HD) has a resolution of approximately 1920 × 1080 pixels, 

while 4K (Ultra HD) boasts around 3840 × 2160 pixels—four times the number of pixels of 1080P. More pixels mean sharper, more detailed images. That’s why, before deciding on TV size, 

you should first choose between 1080P and 4K, as the same TV size will require different viewing distances depending on its resolution.

What TV size is best for your viewing distance? This is a crucial question for anyone buying a TV, and most people have encountered this scenario:

When you visit an electronics store, a reputable salesperson will usually ask, “What’s the approximate distance from your TV stand to your sofa?” Even when shopping online, you’ll often find prompts to select your viewing distance to get personalized size recommendations.

Before making a purchase, it’s essential to know this distance, as it directly impacts your overall viewing comfort and experience. Here’s why:

If your TV is too small for your living room, you’ll struggle to see details clearly from the sofa—leading to eye strain and easy distraction from things outside the screen. On the other hand, a TV that’s too large for a small living room will feel overwhelming; staring at the screen for long periods can cause eye fatigue, 

similar to sitting in the 

front row of a movie theater.

First, let’s break down the ideal TV sizes for different viewing distances when it comes to 1080P TVs (Full HD):

The recommendations below are calculated using the optimal viewing distance formula, which considers display resolution, screen height, and viewing comfort: 

Optimal Viewing Distance (cm) = Screen Height ÷ Vertical Resolution × 3400. For 1080P TVs, the vertical resolution is 1080 pixels. (Note: “P” stands for progressive scan, which you don’t need to worry about—just focus on the resolution.) 

The table below clearly outlines the best TV sizes for different viewing distances; if you don’t want to calculate manually, simply save the guide for quick reference.

As the TV industry evolves, high-definition and ultra-high-definition TVs have become the new norm—and 4K TVs are the most popular choice among consumers. It’s important to approach modern TV screens with an open mind: 

today’s TVs offer improved radiation levels, color accuracy, and brightness, delivering a far better sensory experience than older models. So, what TV sizes work best for different viewing distances with 4K TVs?