# Aspect ratio: `PAL DVD: 1.25`

### Calculation

• Aspect Ratio (short: A/R) is the width of an image or screen, divided by the height. In landscape orientation, the A/R is > 1, for portrait orientation the A/R is < 1 and for square screens, this is = 1.
• Size = `720` x `576` = `0.41` megapixels
• Aspect ratio = `1.25`
• Angle of diagonal = 0.675 rad = 38.7°
• Length of diagonal = 922 pixels

### Letterboxing

How does a 1.25 image fit on a screen with a different aspect ratio?

Barco Escape Cinema (5.94)

Using 21.1 % of the screen

Pillar box
Cinema 2K scope screen (2.39)

Using 52.5 % of the screen

Pillar box
Cinema 2K flat screen (1.85)

Using 67.6 % of the screen

Pillar box
Cinema 2K full envelope (1.90)

Using 66.1 % of the screen

Pillar box
Extra Wide TV (21:9)

Using 52.7 % of the screen

Pillar box
SXGA/QSXGA screen (5:4)

Using 100% of the screen

Perfect match
HD television (16:9)

Using 70.6 % of the screen

Pillar box
SD television (4:3)

Using 94 % of the screen

Pillar box
Square screen (1.00)

Using 80 % of the screen

Letter box
Vertical HD screen (0.56)

Using 45 % of the screen

Letter box