# Understanding screen measurements

Discussion in 'Archived Threads 2001-2004' started by Rick_Brown, Mar 14, 2003.

1. ### Rick_Brown Second Unit

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I assume that widescreen measurements are done on the diagonal, like 4:3 screens? Is there a formula for determining the straight-across horizontal size of a widescreen TV? Thanks.

2. ### Vin Supporting Actor

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Rick, I think you might find this site helpful.

Vin

3. ### Doug_B Screenwriter

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The aforementioned site works well. If you want the nuts and bolts and would also like to work out quick estimates:

A widescreen TV has a 16x9 aspect ratio, so using some right triangle math:

D-squared = W-squared + H-squared (where D is diagonal, W is width, H is height)

and substituting H = 9/16 * W, you get

D = sqrt(337)/16 * W or W = 16/18.36 * D

If you want to figure width out in your head, you'll be fairly close using W = 8/9 * D.

Want a rough estimate of height, use H = D/2.

Doug

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