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How to Select the Right Screen

About Front Projection Screen Surfaces

About Rear Projection Screen Surfaces

Custom Size Screens


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) HDTV (1.78) Letterbox (1.85) SXGA (1.25)
Video Format Video Format Video Format 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.

Calculated using existing height

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"

Calculated using existing width

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 4" black drop.


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