When you see the “TV Size” while shopping for a new TV, it’s important to know that this figure measures the diagonal distance between two corners of the screen. You can thank advertisers and marketers for the diagonal measurement: it allows them to promote a higher number than using the TV length or width, with the hope of increasing sales.
Unfortunately for consumers, we tend to visualize measurements in height and width, which is more practical for laying out space in a room, for example. Thankfully, some simple grade school math allows us to reverse engineer the mess made by TV marketers, allowing us to identify the height and width of any TV given the diagonal TV Size.
Considering a TV with 16:9 aspect ratio and thin bezels, we can accurately calculate the height and width using pythagorean theorem: A2 + B2 = C2.
TV Dimensions: Height & Width
| TV Size (Diagonal) | Height | Width |
| 45-inch TV | 22 inches | 39.2 inches |
| 55-inch TV | 27 inches | 48 inches |
| 65-inch TV | 31.9 inches | 56.7 inches |
| 75-inch TV | 36.8 inches | 65.4 inches |
| 85-inch TV | 41.7 inches | 74.1 inches |
| 95-inch TV | 46.6 inches | 82.8 inches |
| 100-inch TV | 49 inches | 87.2 inches |
| 120-inch TV | 58.8 inches | 104.6 inches |
How Big is a 45-inch TV?
Measured diagonally, a 45-inch TV is 45-inches, but what about the TV height and width? How tall is a 45-inch TV? How wide is a 45-inch TV?
Modern 45-inch TVs with 16:9 aspect ratios and thin bezels are 22 inches tall and 39.2 inches wide.
| Steps to Calculate | TV Height | TV Width |
| Start with TV Size | 45-inches | 45-inches |
| Square the size (65 x 65) | 2025 | 2025 |
| Divide by 337 | 6.008 | 6.008 |
| Square Root of that | 2.451 | 2.451 |
| Multiply by 9 (Height) or 16 (Width) | 22.061 | 39.220 |
| Result | 22 inches | 39.2 inches |
How Big is a 55-inch TV?
Measured diagonally, a 55-inch TV is 55-inches, but what about the TV height and width? How tall is a 55-inch TV? How wide is a 55-inch TV?
Modern 55-inch TVs with 16:9 aspect ratios and thin bezels are 27 inches tall and 48 inches wide.
| Steps to Calculate | TV Height | TV Width |
| Start with TV Size | 55-inches | 55-inches |
| Square the size (65 x 65) | 3025 | 3025 |
| Divide by 337 | 8.976 | 8.976 |
| Square Root of that | 2.996 | 2.996 |
| Multiply by 9 (Height) or 16 (Width) | 26.964 | 47.936 |
| Result | 27 inches | 48 inches |
How Big is a 65-inch TV?
Measured diagonally, a 55-inch TV is 55-inches, but what about the TV height and width? How tall is a 55-inch TV? How wide is a 55-inch TV?
Modern 55-inch TVs with 16:9 aspect ratios and thin bezels are 31.9 inches tall and 56.7 inches wide.
| Steps to Calculate | TV Height | TV Width |
| Start with TV Size | 65-inches | 65-inches |
| Square the size (65 x 65) | 4225 | 4225 |
| Divide by 337 | 12.537 | 12.537 |
| Square Root of that | 3.54 | 3.54 |
| Multiply by 9 (Height) or 16 (Width) | 31.866 | 56.652 |
| Result | 31.9 inches | 56.7 inches |
How Big is a 75-inch TV?
Measured diagonally, a 55-inch TV is 55-inches, but what about the TV height and width? How tall is a 55-inch TV? How wide is a 55-inch TV?
Modern 55-inch TVs with 16:9 aspect ratios and thin bezels are 36.8 inches tall and 65.4 inches wide.
| Steps to Calculate | TV Height | TV Width |
| Start with TV Size | 75-inches | 75-inches |
| Square the size (65 x 65) | 5625 | 5625 |
| Divide by 337 | 16.691 | 16.691 |
| Square Root of that | 4.085 | 4.085 |
| Multiply by 9 (Height) or 16 (Width) | 36.769 | 65.368 |
| Result | 36.8 inches | 65.4 inches |
How Big is a 85-inch TV?
Measured diagonally, a 55-inch TV is 55-inches, but what about the TV height and width? How tall is a 55-inch TV? How wide is a 55-inch TV?
Modern 55-inch TVs with 16:9 aspect ratios and thin bezels are 41.7 inches tall and 74.1 inches wide.
| Steps to Calculate | TV Height | TV Width |
| Start with TV Size | 85-inches | 85-inches |
| Square the size (65 x 65) | 7225 | 7225 |
| Divide by 337 | 21.439 | 21.439 |
| Square Root of that | 4.63 | 4.63 |
| Multiply by 9 (Height) or 16 (Width) | 41.672 | 74.083 |
| Result | 41.7 inches | 74.1 inches |
How Big is a 95-inch TV?
Measured diagonally, a 55-inch TV is 55-inches, but what about the TV height and width? How tall is a 55-inch TV? How wide is a 55-inch TV?
Modern 55-inch TVs with 16:9 aspect ratios and thin bezels are 46.6 inches tall and 82.8 inches wide.
| Steps to Calculate | TV Height | TV Width |
| Start with TV Size | 85-inches | 85-inches |
| Square the size (65 x 65) | 9025 | 9025 |
| Divide by 337 | 26.780 | 26.780 |
| Square Root of that | 5.174 | 5.174 |
| Multiply by 9 (Height) or 16 (Width) | 46.574 | 82.799 |
| Result | 46.6 inches | 82.8 inches |
How to Calculate TV Height & Width
We’ve listed the height and width of popular TV sizes above, and performed the basic math explaining how we arrived at each solution, but why and how are these calculations accurate? Here’s an example using a 65-inch TV:
Understanding the Equation:
Televisions are rectangles, which can be divided into 2 right triangles, with the diagonal between them forming the hypotenuse. The mathematical equation for determining the length of the sides of right triangles is called the Pythagorean Theorem- that’s where we’ll start.
The Pythagorean Theorem:
A2 + B2 = C2
The diagonal of the TV is the hypotenuse of the triangle:
A2 + B2 = (TV Size)2
The other two sides are the height and width:
(Height)2 + (Width)2 = (TV Size)2
Given the aspect ratio of modern televisions is 16:9, we can rephrase A2 + B2 in terms of one single variable that refer to eachother:
(16X)2 + (9X)2 = (TV Size)2
Solving for X we get:
X = √(TV Size)2/337
Explained in plain English, we can solve for X by squaring the TV Size, dividing by 337, and taking the square root of the result.
- For a 65-inch TV you would take the square of 65 (which is 4225), divide by 337 (which is 12.537), and calculate the square root of that result (which is 3.54).
- By re-inserting X into the equation we can determine the height (multiply X by 9) and the width (multiply X by 16)
This calculation can be used to determine the height and width of any TV when given the TV Size, but remember these two things:
- TV size refers to the diagonal of the screen, which doesn’t include any bezel or frame of the TV. The TV may be slightly taller or wider when considering any extra material beyond the screen itself.
- This calculation assumes a 16:9 aspect ratio, which is accurate for the vast majority of modern televisions, but there are some variations. A screen with a different aspect ratio (ex: 4:3) can apply the same concepts but must substitute accordingly.
List of TV Heights & Widths
Below we’ve listed the height and width of every possible TV Size from 45-inches to 120 inches based on the above calculations. Although manufacturers have a limited selection of TV Sizes available, this complete list will insure you can always find the dimensions of your TV, no matter the size.
TV Dimensions (Inches)
| TV Size | TV Height | TV Width |
| 45 | 22.1 | 39.2 |
| 46 | 22.6 | 40.1 |
| 47 | 23.0 | 41.0 |
| 48 | 23.5 | 41.8 |
| 49 | 24.0 | 42.7 |
| 50 | 24.5 | 43.6 |
| 51 | 25.0 | 44.5 |
| 52 | 25.5 | 45.3 |
| 53 | 26.0 | 46.2 |
| 54 | 26.5 | 47.1 |
| 55 | 27.0 | 47.9 |
| 56 | 27.5 | 48.8 |
| 57 | 27.9 | 49.7 |
| 58 | 28.4 | 50.6 |
| 59 | 28.9 | 51.4 |
| 60 | 29.4 | 52.3 |
| 61 | 29.9 | 53.2 |
| 62 | 30.4 | 54.0 |
| 63 | 30.9 | 54.9 |
| 64 | 31.4 | 55.8 |
| 65 | 31.9 | 56.7 |
| 66 | 32.4 | 57.5 |
| 67 | 32.8 | 58.4 |
| 68 | 33.3 | 59.3 |
| 69 | 33.8 | 60.1 |
| 70 | 34.3 | 61.0 |
| 71 | 34.8 | 61.9 |
| 72 | 35.3 | 62.8 |
| 73 | 35.8 | 63.6 |
| 74 | 36.3 | 64.5 |
| 75 | 36.8 | 65.4 |
| 76 | 37.3 | 66.2 |
| 77 | 37.8 | 67.1 |
| 78 | 38.2 | 68.0 |
| 79 | 38.7 | 68.9 |
| 80 | 39.2 | 69.7 |
| 81 | 39.7 | 70.6 |
| 82 | 40.2 | 71.5 |
| 83 | 40.7 | 72.3 |
| 84 | 41.2 | 73.2 |
| 85 | 41.7 | 74.1 |
| 86 | 42.2 | 75.0 |
| 87 | 42.7 | 75.8 |
| 88 | 43.1 | 76.7 |
| 89 | 43.6 | 77.6 |
| 90 | 44.1 | 78.4 |
| 91 | 44.6 | 79.3 |
| 92 | 45.1 | 80.2 |
| 93 | 45.6 | 81.1 |
| 94 | 46.1 | 81.9 |
| 95 | 46.6 | 82.8 |
| 96 | 47.1 | 83.7 |
| 97 | 47.6 | 84.5 |
| 98 | 48.0 | 85.4 |
| 99 | 48.5 | 86.3 |
| 100 | 49.0 | 87.2 |
| 101 | 49.5 | 88.0 |
| 102 | 50.0 | 88.9 |
| 103 | 50.5 | 89.8 |
| 104 | 51.0 | 90.6 |
| 105 | 51.5 | 91.5 |
| 106 | 52.0 | 92.4 |
| 107 | 52.5 | 93.3 |
| 108 | 52.9 | 94.1 |
| 109 | 53.4 | 95.0 |
| 110 | 53.9 | 95.9 |
| 111 | 54.4 | 96.7 |
| 112 | 54.9 | 97.6 |
| 113 | 55.4 | 98.5 |
| 114 | 55.9 | 99.4 |
| 115 | 56.4 | 100.2 |
| 116 | 56.9 | 101.1 |
| 117 | 57.4 | 102.0 |
| 118 | 57.9 | 102.8 |
| 119 | 58.3 | 103.7 |
| 120 | 58.8 | 104.6 |