Direct answer
Converting a screen measurement to inches
Divide a screen measurement in centimeters by 2.54 to convert it to inches. For marketed screen size, use the diagonal measurement from one visible corner to the opposite visible corner.
A television described as 55 inches does not measure 55 inches wide. The number normally refers to the diagonal of the display panel.
Width, height, diagonal size, bezel dimensions, and total device dimensions are different measurements. Confirm which measurement a product specification provides before converting it.
Enter a screen diagonal, width, or height in centimeters to calculate its equivalent in inches.
Screen-size convention
What does screen size in inches measure?
Screen size typically measures the diagonal distance across the active display area. The measurement runs from one corner of the visible panel to the opposite corner.
It generally excludes the outer bezel, frame, stand, keyboard, casing, and other parts of the device.
Common screen-size label
Depends on aspect ratio
Also depends on aspect ratio
The overall television, laptop, monitor, or tablet may be larger than the stated screen size because of the bezel, casing, speakers, hinges, or controls.
Display conversion
Screen-size conversion formula
Use the diagonal centimeter value when calculating the marketed screen size.
For a screen diagonal of 60 centimeters:
The screen diagonal is approximately 23.62 inches.
Manufacturers commonly market screens using standard size categories. A calculated value close to 23.6 inches may be sold as a 24-inch class display.
Worked display sizes
Screen measurement examples
Convert 25.4 centimeters
This is an exact 10-inch diagonal.
Convert 39.6 centimeters
This may correspond to a 15.6-inch laptop display.
Convert 68.6 centimeters
This is approximately a 27-inch monitor diagonal.
Convert 139.7 centimeters
This is an exact 55-inch television diagonal.
Reference values
Common screen sizes in centimeters and inches
| Screen size | Diagonal centimeters | Common device type |
|---|---|---|
| 6.1 in | 15.49 cm | Smartphone |
| 10 in | 25.4 cm | Tablet or small display |
| 13.3 in | 33.78 cm | Laptop |
| 14 in | 35.56 cm | Laptop |
| 15.6 in | 39.62 cm | Laptop |
| 24 in | 60.96 cm | Desktop monitor |
| 27 in | 68.58 cm | Desktop monitor |
| 32 in | 81.28 cm | Monitor or television |
| 43 in | 109.22 cm | Television |
| 55 in | 139.7 cm | Television |
| 65 in | 165.1 cm | Television |
| 75 in | 190.5 cm | Television |
Physical dimensions
Why screen width is smaller than the diagonal
The diagonal crosses both the horizontal and vertical dimensions. It is therefore longer than either the width or height by itself.
For a standard 16:9 screen, a 55-inch diagonal has an active display area approximately 47.9 inches wide and 27 inches high. The exact physical device may be larger because of the bezel.
Corner-to-corner display size
For a 16:9 display
For a 16:9 display
When checking whether a television or monitor fits a space, use the manufacturer's full product width, height, and depth, not only the diagonal screen-size label.
Display proportions
How aspect ratio affects width and height
Aspect ratio describes the proportional relationship between screen width and height. Common ratios include 16:9, 16:10, 3:2, 4:3, and ultrawide ratios such as 21:9.
Two screens can have the same diagonal but different widths and heights when their aspect ratios differ.
| Aspect ratio | Typical shape | Common use |
|---|---|---|
| 16:9 | Widescreen | Televisions and monitors |
| 16:10 | Slightly taller widescreen | Productivity laptops and monitors |
| 3:2 | Taller display | Some laptops and tablets |
| 4:3 | More square | Tablets and older displays |
| 21:9 | Ultrawide | Ultrawide monitors |
Measurement errors
Common screen conversion mistakes
Using the width as the screen size
Marketed screen size generally refers to the diagonal. Converting only the width does not provide the standard size label.
Including the bezel
Measure the active display area unless the specification explicitly asks for the full product dimensions.
Assuming every calculated value is a marketed size
A calculated diagonal of 23.62 inches may be grouped into a 24-inch product category.
Ignoring aspect ratio
Diagonal size alone cannot determine exact width and height unless the aspect ratio is also known.
Continue reading
Related centimeters-to-inches guides
Questions and answers
Frequently asked questions
How do I convert screen centimeters to inches?
Divide the centimeter measurement by 2.54.
Does screen size measure width?
Usually not. Marketed screen size normally measures the diagonal of the active display.
How many centimeters is a 55-inch screen?
A 55-inch diagonal equals exactly 139.7 centimeters.
Why is a 55-inch television not 55 inches wide?
Because 55 inches describes the diagonal. Width depends on the screen's aspect ratio.
Convert a measurement
Use the Centimeters to Inches Converter
Enter any whole or decimal centimeter value to calculate decimal inches and a rounded common fraction.
Open Centimeters to Inches ConverterLast updated: July 27, 2026