Screen Size Comparison Calculator
See how two screens really compare in width, height and viewing area, even when their aspect ratios differ.
How to use the Screen Size Comparison Calculator
- Enter the screen a diagonal and pick its unit.
- Choose the screen a aspect ratio.
- Enter the screen b diagonal and pick its unit.
- Choose the screen b aspect ratio.
- Press Calculate. The result updates automatically as you type, and you can switch the result unit at any time.
About the Screen Size Comparison Calculator
Diagonal sizes can only be compared directly when two screens share an aspect ratio. A wider screen has a smaller height for the same diagonal, so a "bigger" ultrawide can actually be shorter than a 16:9 panel. Comparing width, height and area separately shows what you gain.
Height is usually the best predictor of how large video and text feel at a given distance, since most content is framed to fill the height. Width matters for productivity, racing games and side-by-side windows. The last result converts screen B to the 16:9 diagonal with the same height, a handy way to judge an ultrawide against a familiar TV or monitor size.
Formula
Width = D × Rw ÷ √(Rw² + Rh²), Height = D × Rh ÷ √(Rw² + Rh²)
Area difference = (Area B ÷ Area A − 1) × 100%
A 27 in 16:9 monitor is 23.5 × 13.2 in (311 in²). A 34 in 43:18 ultrawide is 31.4 × 13.1 in (412 in²): almost exactly the same height but 32% more area, all of it added to the sides.
Example calculation
Using the default values:
- Screen A diagonal = 27 in
- Screen A aspect ratio = 16:9
- Screen B diagonal = 34 in
- Screen B aspect ratio = 21:9 (43:18)
the calculator returns:
- Screen B area vs A: 32.2%
- 16:9 size with the same height as B: 26.779 in
Frequently asked questions
Is a 34 inch ultrawide bigger than a 27 inch monitor?
It is wider and has about a third more area, but the height is about the same as a 27 in 16:9 monitor.
How much bigger is an 85 inch TV than a 65 inch?
About 71% more screen area, because (85 ÷ 65)² ≈ 1.71.
Why compare area instead of diagonal?
Area grows with the square of the diagonal, so small diagonal changes make a larger difference to how much picture you see.
Last updated: · Category: TV & Video calculators