What Is a TV Dimensions Calculator?
A TV dimensions calculator finds the actual width and height of a television's screen from its diagonal size and aspect ratio. Because TVs are advertised by their diagonal measurement, the real width and height are not obvious — yet they are what matter for fitting a TV into a media unit or mounting space. Enter the screen size and the calculator returns the dimensions.
How to Use the Calculator
- Enter the diagonal screen size (the advertised inches).
- Confirm the aspect ratio (16:9 for most modern TVs).
- Calculate — see the screen width and height.
How TV Dimensions Are Found
For a 16:9 TV, the width and height relate to the diagonal by fixed ratios. The width is about 87% of the diagonal and the height about 49%. So a 55-inch TV has a screen roughly 48 inches wide and 27 inches tall.
Screen Size to Dimensions (16:9)
| Diagonal | Width (approx) | Height (approx) |
|---|---|---|
| 43" | 37.5" | 21.1" |
| 55" | 47.9" | 27.0" |
| 65" | 56.7" | 31.9" |
| 75" | 65.4" | 36.8" |
Don't Forget the Bezel and Stand
- The overall TV is slightly larger than the screen due to the bezel/frame.
- Allow extra width and height when measuring for a cabinet or niche.
- Check the stand width if placing on furniture, and VESA mount pattern for wall mounting.
- Leave room for ventilation and cables.
Frequently Asked Questions
How wide is a 55-inch TV?
A 55-inch 16:9 TV screen is about 47.9 inches wide and 27 inches tall, with the overall TV slightly larger because of the bezel.
How do you find TV dimensions from screen size?
For a 16:9 TV, the width is about 87% of the diagonal and the height about 49%. The calculator computes both from the advertised size.
Why is the screen size measured diagonally?
TVs are measured corner to corner across the screen, giving a single number that represents overall display size regardless of aspect ratio.
Should I account for the bezel?
Yes — the full TV is a bit larger than the screen due to the frame, so add a margin when checking whether it fits a space.
Is this TV dimensions calculator free?
Yes — it is completely free, requires no signup, and gives screen width and height.