aspect ratio

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aspect ratio

[′a‚spekt ‚rā·shō]
(aerospace engineering)
The ratio of the square of the span of an airfoil to the total airfoil area, or the ratio of its span to its mean chord.
(design engineering)
The ratio of frame width to frame height in television; it is 4:3 in the United States and Britain.
In any rectangular configuration (such as the cross section of a rectangular duct), the ratio of the longer dimension to the shorter.
(mechanical engineering)
In an automotive vehicle, the ratio of the height of a tire to its width. Also known as tire profile.
(nucleonics)
The ratio of the plasma diameter of a toroidal controlled fusion device to the major diameter of the torus.

Aspect ratio

In any rectangular configuration, the ratio between the longer dimension and the shorter dimension.

aspect ratio

1. In any rectangular configuration (such as the cross section of a rectangular duct), the ratio of the longer dimension to the shorter.
2. In a rectangular configuration, the ratio of the long-side to the short-side.

aspect ratio

aspect ratioclick for a larger image
The ratio of span of the wing to its chord. It also may be expressed as the ratio of the square of the span of the wing to its area. Aspect ratio (A) = span2/wing area, span/chord, span × chord/chord2, or wing area/chord2.

aspect ratio

(graphics)
The ratio of width to height of a pixel, image, or display screen. Square pixels (1:1) are considered preferable but displays are usually about 5:4.

aspect ratio

The ratio of width to height of an object. Stating the relationship of one side to the other, it is widely used to describe the shape of a TV or computer screen. For example, the aspect ratio of a standard-definition (SD) screen is 4:3, which is a relatively square rectangle. The 4:3 means "4 to 3," or four units wide to three units high. High-definition TV (HDTV) has a 16:9 ratio, which is a wide rectangle that is still not as wide as most movie theater (cinema) screens.

Another way of expressing the 4:3 and 16:9 ratios is 1.33:1 and 1.78:1, but these latter designations are used mostly for cinema formats, rather than TV (see below).

Standard or Wide Screen?
The common measurement of a computer monitor or TV is the screen's diagonal measurement in inches. However, a 20" screen does not disclose whether its layout is the older 4:3 (square) or 16:9 (wide). See letterbox, screen resolution, HDTV display modes and anamorphic DVD.


Standard and HDTV Aspect Ratios
Fitting wide screen HDTV image (16:9) on the right into a standard-definition SDTV (4:3) on the left creates the "letterbox effect" (black bars on top and bottom). (Image courtesy of Intergraph Computer Systems.)



Standard and HDTV Aspect Ratios
Fitting wide screen HDTV image (16:9) on the right into a standard-definition SDTV (4:3) on the left creates the "letterbox effect" (black bars on top and bottom). (Image courtesy of Intergraph Computer Systems.)