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Do you want to know the area of your 16:9 screen, in square feet? Just take the diagonal measurement, in

*inches*, square it, and divide by 337.

Examples:

100" diagonal: area = 100 * 100 / 337 = 29.67 sq. ft.

120" diagonal: area = 120 * 120 / 337 = 42.73 sq. ft.

Believe it or not, this is

*exact*, though only for 16:9 screens. The numbers just work out that way. This may not seem like a big deal to you but frankly I was tired of having to jump through some Pythagorean hoops to calculate the width and height of a screen from its diagonal, convert them to feet, then multiply them together.

If you want to compute your screen brightness in foot-lamberts, just take the

*calibrated*brightness of your projector, in ANSI lumens, multiply by the screen gain, multiply by 337, then divide by the diagonal size (in inches), twice.

Example:

120" diagonal StudioTek 130, 600 calibrated lumens:

brightness = 600 * 1.3 * 337 / 120 / 120 = 18.25 ft-L.

Again, this is exact, but only for 16:9 projectors on 16:9 screens.

See? 337 is a home theater nut's favorite number.

Just remember it. 337. 337. 337. It will never lead you wrong.

Until you get a 2.35:1 screen.