iPhone Duo
#17.1″
15.8×8.9 cm
Screen used80%
×1.76
How big is 16:9 content on each device?
Screens drawn to physical scale. Each rectangle is the area a video of that format actually fills, after letterboxing.
iPhone Duo · 7.1″
1 cm
Galaxy Z Fold 8
#27.0″
15.5×8.7 cm
Screen used75%
×1.69
iPhone 18 Pro Max
#35.9″
13.0×7.3 cm
Screen used82%
×1.20 ↻ rotated 90°
iPhone 18 Pro
#45.4″
11.9×6.7 cm
Screen used82%
↻ rotated 90°
How it works
Each screen is drawn from its diagonal and pixel resolution, so every rectangle is at true physical scale relative to the others. For the chosen format, AspectFit finds the largest picture of that shape that fits the screen, the way a video player letterboxes it, and draws only that area.
Each device is turned to whichever orientation shows the picture larger, so a tall phone plays 16:9 sideways and a landscape foldable plays 9:16 upright. The numbers are picture diagonals, plus the area multiple against the smallest device you selected.
Questions
Why doesn’t a bigger screen always mean bigger video?
A diagonal says nothing about shape. A tall 20:9 phone has to shrink 16:9 video to fit its short side, while a squarer foldable with a smaller diagonal can show the same video larger. What matters is the picture left after letterboxing, which is what AspectFit draws.
What is letterboxing?
When a video’s shape doesn’t match the screen, the player scales it until it touches two edges and fills the rest with black bars: top and bottom (letterbox) or left and right (pillarbox). Those bars are wasted screen, and they can take a third or more of a tall phone or a 4:3 tablet.
Are foldables better for watching video?
For 4:3, 3:2 and square content, clearly: book-style foldables are close to those shapes. For 16:9 the best ones, like the iPhone Duo, show a picture about 7″ across, well above the roughly 5.9″ of the biggest slab phones. For 2.39:1 movies the advantage mostly disappears.
How accurate are the sizes?
They come from each screen’s advertised diagonal and resolution, assuming square pixels. Rounded corners, camera cut-outs and on-screen controls are ignored, so real playback can be slightly smaller. Rumored devices use leaked specs and are marked with an asterisk.