How to calculate monitor inches
Screen size is an important reference indicator when purchasing a monitor. However, many users are not clear about the specific calculation method of the unit "inch". This article will explain in detail the definition and calculation method of monitor inches, and attach a comparison table of common monitor sizes to help you better choose a monitor that suits you.
1. Definition of monitor inches

The inch of the monitor refers to the diagonal length of the screen. 1 inch is equal to 2.54 centimeters. It should be noted that the size here is the diagonal length of the screen display area, excluding the monitor's borders.
2. Calculation method of monitor inches
The size of the monitor can be calculated by the following formula:
Diagonal length (inches) = √ (Horizontal pixels² + Vertical pixels²) ÷ Pixel Density (PPI) × 2.54
Among them, PPI (Pixels Per Inch) is the number of pixels per inch, which represents the pixel density of the screen. The higher the PPI, the more delicate the display effect.
3. Common monitor size comparison table
| Dimensions (inches) | Diagonal length (cm) | Common resolutions | Applicable scenarios |
|---|---|---|---|
| 21.5 | 54.61 | 1920×1080 | Office, daily use |
| 24 | 60.96 | 1920×1080 | Office, entertainment |
| 27 | 68.58 | 2560×1440 | design, games |
| 32 | 81.28 | 3840×2160 | Professional design, audio and video entertainment |
| 34 (with fish screen) | 86.36 | 3440×1440 | multitasking, gaming |
4. How to choose the monitor size that suits you?
1.Office use: 21.5-inch to 27-inch monitors are sufficient for daily office needs, and the resolution is recommended to be 1920×1080 or higher.
2.Intended use: It is recommended to choose a size of 27 inches and above with a resolution of at least 2560×1440 to ensure accurate presentation of colors and details.
3.Game use: 27-inch to 34-inch monitors are more suitable for gamers. High refresh rate and low response time are also important considerations.
4.Audiovisual entertainment: 4K monitors of 32 inches and above can provide a more immersive viewing experience.
5. Popular display technology trends (hot spots in the past 10 days)
1.Mini LED technology: Recently, many manufacturers have launched displays using Mini LED backlights, which provide higher brightness and contrast, becoming the new favorite of high-end displays.
2.Popularity of OLED displays: As prices drop, OLED displays gradually enter the mainstream market, attracting much attention for their excellent color performance and infinite contrast ratio.
3.High refresh rate becomes standard: Monitors with refresh rates of 144Hz and above have become the first choice for gamers, and some products even reach 360Hz.
4.Environmentally friendly material display: Many brands have launched displays made of recycled materials in response to the call for environmental protection.
6. Tips for buying monitors
1. In addition to size, you should also pay attention to parameters such as resolution, panel type (IPS, VA, TN), refresh rate, and color gamut.
2. It is recommended to select the size according to the distance of use: 24-27 inches is suitable for general office distances (50-70cm), and 32 inches and above can be considered for longer distances (more than 80cm).
3. The hairtail screen (21:9) is suitable for multi-tasking, but some games and software may have compatibility issues.
4. It is best to conduct an on-site inspection before purchasing to feel whether the actual display effect and size are suitable for your needs.
Through the above content, I believe you already have a clear understanding of the calculation method of monitor inches. Choosing the right monitor size can take your work and entertainment experience to the next level!
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