How to Measure TV Size? Step-by-Step Guide

How to measure TV size? Learning how to measure a TV isn’t difficult, but there are a few points that you should be aware of. The most typical TV measurement is screen size, and you can calculate this by measuring from corner to corner.

However, if you require the TV’s dimensions before installing it in your room, it would be best to determine its width, height, and depth.

You can accomplish this manually by getting a tape measure. Alternatively, if you understand the diagonal size, you can use a calculator to find out the width and height of the screen.

How Do You Measure a TV Screen?

Before buying or installing a TV, it can be helpful to understand its dimensions. While it isn’t difficult to measure a TV, there are a few points you might want to consider before you get stuck in. Which are the most appropriate things to measure, and why are they important? Let’s find out.

Total Time: 5 minutes

Measure the TV’s Screen Size

The usual way of expressing the size of a TV screen is by the diagonal length of the visible screen in inches. So, if you want to specify the size of your TV screen, you should measure from the top left corner to the bottom right corner. Or from bottom left to top right. It doesn’t matter which, because the result will be the same.

There shouldn’t be a bezel around the edge of the screen – just the area that displays the picture. Standard TV sizes range from 28 or 30-inches for small LED TVs to 70 or 80-inches or more for large LEDs and OLED screens.

Some manufacturers may tell a TV’s size as a ‘class’ – so they might say it is a 55-inch class. This indicates that the screen measures 55-inches from corner to corner, including the frame, so the actual visible screen size will be slightly less.

Measure the TV’s Width

To measure the TV for placement in a cabinet or recess, it is best to calculate the exact dimensions. Therefore, your measurements should have the bezel around the edge of the screen because this will give you a better idea of the exact size of the TV.

Establish your ruler on the left edge of the screen and measure across to the right-hand edge. Recognize the need to include the frame on both sides. You should also consider where the wires for external devices will need to run. TVs usually have connections on one edge or the rear.

Check your TV to see where the cables connect your television, and if it’s on one side, make sure you add some extra space there. You can also use a TV dimensions calculator to pick the width without using a ruler if you know the TV screen size.

Find Out the TV’s Height

The height can be measured by measuring the distance from the top of the frame to the bottom edge of the frame.

TVs usually do not have connectors at the top or bottom. However, if you install the TV on a stand, you should also consider what this will count to the overall height. If you haven’t bought the TV yet, the manufacturer’s website will often display the TV’s dimensions, including the stand.

Measure the Depth of the TV

Before installing a TV, another important measurement to know is the depth. The deep is the distance from the front of the screen to the back. Although numerous modern TVs have extremely thin screens – especially OLED TVs – the back of the TV will always have a thicker section where the TV’s electronics live.

By estimating the depth, you will know how far the screen will project from the wall or cabinet.
However, you should also check if any of the connections you need are on the back, as this will require more room for installation.

One method to save space at the back is to buy right-angle connectors, making the wires hang down rather than point towards the wall. Using a TV stand may also count to the overall depth, so don’t forget to check this.


  • No supplies required


  • 1x tape measure or ruler

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