How to Calculate a Custom Screen Size

Use the following formulas to calculate a custom size. The formulas will assist you in finding the viewing area only.

NTSC (1.33) Video Format	HDTV (1.78) Video Format	Leterbox (1.85) Video Format	SXGA (1.25) Video Format
Diagonal/1.667 = Height	Diagonal x 0.49091 = Height	Diagonal x 0.4762 = Height	Diagonal x 0.625 = Height
Height x 1.33 = Width	Diagonal x 0.87247 = Width	Diagonal x 0.88 = Width	Diagonal x 0.78125 = Width
Width/1.33 = Height	Height x 2.0395 = Diagonal	Height x 2.10 = Diagonal	Height x 1.60 = Diagonal
Height x 1.667 = Diagonal	Width x 1.14585 = Diagonal	Width x 1.135 = Diagonal	Width x 1.28 = Diagonal
	Height x 1.78 = Width	Height x 1.85 = Width	Height x 1.25 = Width
	Width x 0.561837 = Height	Width x 0.5405 = Height	Width x 0.80 = Height

Screen Size Conversion Chart

Use the following chart to convert an existing NTSC video format screen size to either an HDTV or Letterbox format size.

NTSC (1.33) Viewing Area	HDTV (1.78) Viewing Area	Letterbox (1.85) Viewing Area
H x W	H x W	H x W
43" x 57"	43" x 77"	43" x 80"
50" x 67"	50" x 89"	50" x 92.5"
57" x 77"	57" x 102"	57" x 105"
60" x 80"	60" x 107"	60" x 111"
69" x 92"	69" x 123"	69" x 128"
87" x 116"	87" x 155"	87" x 161"
105" x 140"	105" x 187"	105" x 194"

NTSC (1.33) Viewing Area	HDTV (1.78) Viewing Area	Letterbox (1.85) Viewing Area
H x W	H x W	H x W
43" x 57"	32" x 57"	31" x 57"
50" x 67"	38" x 67"	36" x 67"
57" x 77"	43" x 77"	42" x 77"
60" x 80"	45" x 80"	43" x 80"
69" x 92"	52" x 92"	50" x 92"
87" x 116"	65" x 116"	63" x 116"
105" x 140"	79" x 140"	76" x 140"

Screen Borders and Drop

Black masking borders are standard on most Da-Lite front projection screens at no extra charge. Borders enhance the perceived brightness of an image on a screen. The human eye perceives the image to have more contrast and a sharper picture with brighter colors. Borders also allow the projected image to "bleed-off" the screen for professional appearing presentations.
Drop is also available on most Da-Lite wall, ceiling and electric screens. Drop is extra fabric added to the top or bottom of the screen to adjust the screen surface to within normal viewing heights. Drop can be specified in either black or white.

Note: Tensioned electric screens are standard with 12" black drop at the top in all sizes except for 200" diagonal which is standard with 2" black drop.