How to Measure TV Size? Inch/Screen Calculation Guide with Measuring Tape
When buying a new TV unit or, most importantly, ordering a TV screen protector, the most frequently asked question is: "How many inches is my television?"
Often, measuring the outer casing of the television or just its horizontal width can lead us astray. Here's the simplest way to accurately determine your TV's size with a regular measuring tape at home!
1. Where to Measure TV Size From? (The Golden Rule)
The biggest mistake made when measuring TV size is to hold the measuring tape horizontally (from right to left). However, according to international standards, TV sizes are measured diagonally, meaning from one corner to the opposite diagonal corner.
How to do it?
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Place the end of the measuring tape on the bottom left corner of the screen.
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Extend the other end to the top right corner (diagonally).
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Measure only the glass part inside, not the frame.
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The resulting centimeter (cm) value is your screen size.
2. Measuring Tape to Inch (") Conversion Table
You can quickly check the inch equivalent of your measured centimeter value and its market "screen" equivalent in the table below.
| Diagonal Measurement (cm) | Inch (") Equivalent | Market Name (Screen) |
| 80 - 82 cm | 32" | 82 Screen |
| 101 - 103 cm | 40" | 102 Screen |
| 106 - 108 cm | 42" / 43" | 106 - 109 Screen |
| 123 - 127 cm | 49" / 50" | 123 - 127 Screen |
| 138 - 140 cm | 55" | 139 - 140 Screen |
| 146 - 148 cm | 58" | 147 Screen |
| 164 - 165 cm | 65" | 165 Screen |
| 189 - 191 cm | 75" | 190 Screen |
3. Practical Mathematical Formula
If you don't have the table with you, you can use this simple formula:
Screen (cm) ÷ 2.54 = Inches (")
For example: You made a diagonal measurement and found 140 cm. 140 / 2.54 = 55.1". So your television is 55 inches.
4. Learning from the Model Number (The Most Reliable Way)
If you don't want to bother with a measuring tape, check the label on the back of your television. The first two digits in the model number usually indicate the screen size.
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Example 1: Samsung 55AU7000 = 55 inches.
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Example 2: LG 43UP7500 = 43 inches.
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Example 3: Philips 50PUS8505 = 50 inches.
5. Why is Accurate Measurement Important When Buying a Screen Protector?
TV screen protectors are produced to millimeter precision according to the delicate structure of the panel. A screen protector of the wrong size:
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Will leave the corners of the screen exposed.
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Will not fit perfectly on the television frame.
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Will disrupt the aesthetic of the display.
💡 Expert Recommendation: If you are unsure about the measurement, you can provide us with your TV's model number, and we can help you choose a 100% compatible panel.