Diagonal Screen Size Calculator
Calculate the actual width and height of a screen based on its diagonal size and aspect ratio. This calculator helps you compare different screen sizes and understand the actual dimensions.
Understanding Screen Size and Aspect Ratio
Screen size is typically measured diagonally from corner to corner, but the actual width and height depend on the aspect ratio. Understanding these dimensions helps when comparing screens or determining if a display will fit in your space.
Common Aspect Ratios
| Aspect Ratio | Common Uses | Description |
|---|---|---|
| 16:9 | HDTV, most monitors | Standard for modern TVs and computer monitors |
| 16:10 | Some computer monitors | Slightly taller than 16:9, popular for productivity |
| 4:3 | Old TVs, some tablets | Traditional TV format before widescreen |
| 21:9 | Ultrawide monitors | Cinematic format for movies and gaming |
| 32:9 | Super ultrawide monitors | Equivalent to two 16:9 screens side by side |
Screen Size Comparison
| Diagonal Size | 16:9 Width | 16:9 Height | 4:3 Width | 4:3 Height |
|---|---|---|---|---|
| 24 inches | 20.9" | 11.8" | 19.2" | 14.4" |
| 32 inches | 27.9" | 15.7" | 25.6" | 19.2" |
| 42 inches | 36.6" | 20.6" | 33.6" | 25.2" |
| 55 inches | 47.9" | 27.0" | 44.0" | 33.0" |
| 65 inches | 56.7" | 31.9" | 52.0" | 39.0" |
Frequently Asked Questions
Why is screen size measured diagonally?
Diagonal measurement became standard because it provides a single number that can be compared across different aspect ratios. However, it doesn't tell the full story about actual screen dimensions.
How do I measure a screen's aspect ratio?
Measure the width and height of the visible screen area (not including bezels). Divide width by height and simplify the ratio. For example, 3840×2160 pixels simplifies to 16:9 (3840/2160 = 16/9).
Does a bigger diagonal always mean more screen area?
Not necessarily. A 32" 4:3 screen has less area than a 32" 16:9 screen because of the different aspect ratios. Always compare actual dimensions or screen area when evaluating size differences.
How do I know if a TV will fit in my space?
Use this calculator to determine the actual width and height, then measure your available space. Remember to account for the TV stand or wall mount depth, and any additional space needed for ventilation.
What's the difference between screen size and resolution?
Screen size refers to physical dimensions (in inches or cm), while resolution is the number of pixels (e.g., 1920×1080). A higher resolution on the same size screen means higher pixel density (sharper image).
How does viewing distance relate to screen size?
As a general rule, your viewing distance should be about 1.5 to 2.5 times the screen's diagonal measurement for optimal viewing experience. Larger screens require greater viewing distances.
Are all 16:9 screens exactly the same shape?
While they have the same aspect ratio, some manufacturers may have slightly different dimensions due to bezel size or measurement methods. Always check the exact specifications if precise dimensions are important.
How do I convert between inches and centimeters?
1 inch equals 2.54 centimeters. To convert inches to cm, multiply by 2.54. To convert cm to inches, divide by 2.54. Our calculator can handle both units.
What about curved screens?
Curved screens are still measured diagonally in a straight line. The curvature doesn't affect the diagonal measurement but may affect how the screen fits in your space.
How do I compare two different aspect ratios?
Compare either the width, height, or screen area rather than just the diagonal. A 32" 16:9 screen is wider but shorter than a 32" 4:3 screen.
Viewing Distance Recommendations
| Screen Size | Minimum Distance | Recommended Distance | Maximum Distance |
|---|---|---|---|
| 32 inches | 4 feet | 5-6 feet | 8 feet |
| 42 inches | 5.25 feet | 6.5-8 feet | 10.5 feet |
| 55 inches | 6.9 feet | 8.6-10.5 feet | 13.8 feet |
| 65 inches | 8.1 feet | 10.1-12.5 feet | 16.3 feet |
| 75 inches | 9.4 feet | 11.7-14.6 feet | 18.8 feet |
Installation Considerations
- Measure your space carefully before purchasing
- Account for bezel size when calculating total dimensions
- Consider viewing angles and eye level placement
- Ensure proper ventilation around the display
- Check weight limits for wall mounts or stands