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How do I calculate the screen dimensions of a HDTV?
Posted by: JEBB
Date: March 28, 2008 06:47PM
How do I calculate the screen dimensions of a HDTV? I know the diagonal and the ratio of the sides. My algebra is very rusty.
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: freeradical
Date: March 28, 2008 06:55PM
You need to find the angle by taking the arctangent of the ratio of the vertical height divided by the horizontal width.

Using this angle and the length of the diagonal, you use the sin and cos functions to find how long the sides are.
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: papercup
Date: March 28, 2008 06:57PM
I would use a ruler.


Edit: an HD ruler



Edited 1 time(s). Last edit at 03/28/2008 06:58PM by papercup.
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: microchip13
Date: March 28, 2008 07:04PM
Playing off of freeradicals way....


16:9...(goes to car to get TI calculator...)

arctan(9/16)=34.22 degrees.

Lets say your TV is 42 inches....
42cos(34.22)=34.729: width
42sin(34.22)=23.61: height.



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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: The UnDoug
Date: March 28, 2008 07:17PM
Guess?
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Re: How do I calculate the screen dimensions of a HDTV?
Date: March 28, 2008 07:31PM
I like microchip's way, but this site disagrees with the result:

[www.cavecreations.com]

For a 42" HDTV--36.6 x 20.6 inches
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: Forrest
Date: March 28, 2008 07:34PM
No math needed - check the product sheet on the HDTV you want to buy. It will list the dimensions of the TV and the screen.
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: freeradical
Date: March 28, 2008 07:38PM
Quote
Article Accelerator
I like microchip's way, but this site disagrees with the result:

[www.cavecreations.com]

For a 42" HDTV--36.6 x 20.6 inches

Yeah, the angle is really 29.36 degrees.
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: JEBB
Date: March 28, 2008 08:10PM
I had to call a physicist friend. Here is the answer:
d = diameter, h = height, w = width

d^2 = w^2 + h^2

the ratio of width to height is 16 to 9

d^2 = (16/9 h)^2 + h^2

d^2 = 4.16h^2

d = 2.04h

So for a 32" screen the height is about 16"
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: LyleH
Date: March 28, 2008 09:50PM
Here's where I get my info on screen sizes/dimensions. And the chart also lets you relate 4:3 screens to 16:9 screen sizes. Great for figuring out what size widescreen you need to get to compare with a 4:3 screen. I'm no good at math, anyway :-(

[www.cavecreations.com]

LyleH
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: WHiiP
Date: March 28, 2008 10:50PM
Product Spec sheets . . . anything else is simply guessing. Screen size is NOT the size of the TV, so if you are trying to fill a specific space, GFL . . . grinning smiley



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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: Jimmypoo
Date: March 29, 2008 08:43AM
Quote
Forrest
No math needed - check the product sheet on the HDTV you want to buy. It will list the dimensions of the TV and the screen.


Damn mind reading, joke stealing plagiarist forum puke!
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: Forrest
Date: March 29, 2008 09:41AM
Quote
Jimmypoo
Quote
Forrest
No math needed - check the product sheet on the HDTV you want to buy. It will list the dimensions of the TV and the screen.


Damn mind reading, joke stealing plagiarist forum puke!

spinning smiley sticking its tongue out
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: comaplate
Date: March 29, 2008 05:06PM
Check the spec sheets, or measure a screen with a ruler.
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: AllGold
Date: March 29, 2008 06:07PM
Jebb, my algebra is awful but shouldn't d = diagonal? What does diameter have to do with anything?

P.S.: My geometry is awful too. ;)



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Re: How do I calculate the screen dimensions of a HDTV?
Date: March 30, 2008 12:42AM
I think that's what Jebb's physicist friend means. The physicist appears to be channelling an ancient Greek philosopher...
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: ubikk
Date: January 06, 2009 02:04PM
Quote
Forrest
No math needed - check the product sheet on the HDTV you want to buy. It will list the dimensions of the TV and the screen.

I assume that the OP wants to figure out what the minimum size HDTV is that they need to replace their current TV. There's a chart that shows what size(s) of HDTV you need to get the same size (e.g. "height") picture as a 4:3 TV here (I'd try to cut and paste but it looses the table layout) :

Replacement Sizes for replacing 4:3 TV with HDTVs
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Re: How do I calculate the screen dimensions of a HDTV?
Posted by: Forrest
Date: January 07, 2009 11:34AM
Must be a slow day - this message is 9 months old!
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