TV Screen Size in Inches to cm: Width and Height Chart

The short answer

A TV's size in inches is the diagonal of the screen, corner to corner. Multiply it by 2.54 to get centimetres: a 55-inch TV is 139.7 cm diagonally, a 43-inch is 109.2 cm and a 32-inch is 81.3 cm. The diagonal is not the width. For a standard 16:9 screen, the width is about 87% of the diagonal and the height about 49%, so a 55-inch screen is roughly 121.8 cm wide and 68.5 cm tall. Use the Length Converter to convert any measurement between inches and centimetres.

Screen size chart for 16:9 TVs and monitors

The table gives the diagonal and the visible screen area for the 16:9 shape used by almost all TVs and most monitors. Values are rounded to one decimal place.

Size	Diagonal (cm)	Screen width (cm)	Screen height (cm)
24 inch	61.0	53.1	29.9
27 inch	68.6	59.8	33.6
32 inch	81.3	70.8	39.8
40 inch	101.6	88.6	49.8
43 inch	109.2	95.2	53.5
50 inch	127.0	110.7	62.3
55 inch	139.7	121.8	68.5
65 inch	165.1	143.9	80.9
75 inch	190.5	166.0	93.4
85 inch	215.9	188.2	105.8

Important: these are the dimensions of the picture area only. The TV itself is bigger because of the frame (bezel), and a stand adds height and depth. Before buying a TV for a specific space, check the product's own dimensions "with stand" and "without stand" on the manufacturer's specification sheet.

How the width and height are calculated

A 16:9 screen is a rectangle whose width and height are in the ratio 16 to 9. The diagonal forms the long side of a right-angled triangle, so by Pythagoras:

• Diagonal factor = √(16² + 9²) = √337 ≈ 18.358
• Width = diagonal × 16 ÷ 18.358 ≈ diagonal × 0.8716
• Height = diagonal × 9 ÷ 18.358 ≈ diagonal × 0.4903

Worked example for a 43-inch TV:

Width in inches: 43 × 0.8716 = 37.5 inches

Height in inches: 43 × 0.4903 = 21.1 inches

Convert each to centimetres by multiplying by 2.54: width 95.2 cm, height 53.5 cm

Converting with the Length Converter

Open the Length Converter.

Type the size in inches, for example 55.

Set From to Inch (in) and the target to Centimeter (cm). The result is 139.7.

To convert a width or height you have worked out, type that number instead.

The list below shows the same length in metres, feet, millimetres and other units, which is useful if your wall plan is in feet or millimetres.

The converter uses 1 inch = 0.0254 m, which is the exact international definition, so 1 inch = 2.54 cm.

Working backwards: the largest TV for your space

Often you know the space and want the biggest screen that fits. Reverse the steps:

Measure the available width in centimetres, for example 120 cm between two shelves.

Convert it to inches with the Length Converter: 120 cm is 47.24 inches.

Divide by 0.8716 to get the diagonal of a 16:9 screen that exactly fills that width: 47.24 ÷ 0.8716 = 54.2 inches.

Round down to a real size. Here a 50-inch TV (screen about 110.7 cm wide) fits, but a 55-inch screen (about 121.8 cm wide) is already wider than the space, before you add the frame.

Do the same check with the height if the TV goes into a cabinet or under a shelf.

Ultrawide and other aspect ratios

Not every screen is 16:9. Ultrawide monitors are often described as 21:9, and some laptops use 16:10 or 3:2. The same diagonal gives a different width and height depending on the shape:

• For a ratio W:H, width = diagonal × W ÷ √(W² + H²) and height = diagonal × H ÷ √(W² + H²).
• A 34-inch screen at 21:9 works out to about 79.4 cm wide and 34.0 cm tall, wider but much shorter than a 34-inch 16:9 screen would be.

Marketing names for aspect ratios are sometimes rounded, so for an exact fit check the manufacturer's stated screen dimensions.

Will it fit? A quick checklist

• Measure the space in centimetres, both width and height, and note anything that limits it, such as shelves, a window frame or a switchboard.
• Compare with the TV's full dimensions, not the screen size. Add a few centimetres either side for airflow and cables.
• Check the stand. Some TVs have feet near the edges, which need a wider table than the TV itself.
• For wall mounting, the bracket uses the VESA hole pattern on the back of the TV. Check the bracket supports your TV's pattern and weight.

Common mistakes

• Treating the diagonal as the width. A "55-inch" TV is about 121.8 cm wide, not 139.7 cm. Planning with the diagonal makes you think the TV is bigger than it is.
• Dividing by 2.54 instead of multiplying. Inches to centimetres means multiplying. If the number got smaller, you went the wrong way.
• Ignoring the bezel. Thin bezels are small, but they still add to the total width and height.
• Comparing a 16:9 TV with an ultrawide monitor by diagonal. The same diagonal can mean a very different screen area.

Related conversions

• Room or wall measurements in feet and inches: How to Convert Height in Feet and Inches to cm uses the same method.
• Room floor area in square feet or square metres: Area Converter.