Engineering and Architectural scale table

Below are two standard scale tables for Engineering and Architectural drawings.

To obtain the scale factor of an Engineering drawing scale:

  1. Multiply the feet of the desired scale by 12.
  2. For example 1″=50′ scale would be 50×12 = Scale Factor 600.
Engineering Scale
Drawing Scale Scale Factor Viewport Scale
1″ = 10′ 120 1/120xp
1″ = 20′ 240 1/240xp
1″ = 30′ 360 1/360xp
1″ = 40′ 480 1/480xp
1″ = 50′ 600 1/600xp
1″= 60′ 720 1/720xp
1″ = 70′ 840 1/840xp
1″ = 80′ 960 1/960xp
1″ = 90′ 1080 1/1080xp
1″ = 100′ 1200 1/1200xp
1″ = 200′ 2400 1/2400xp
1″ = 300′ 3600 1/3600xp
1″ = 500′ 4800 1/4800xp
1″ = 1000′ 9600 1/9600xp

To obtain the scale factor of an Architectural drawing scale:

  1. Multiply the denominator of the desired scale by 12.
  2. for example 1/4 scale would be 4×12 = Scale Factor 48.
Architetural Scale
Drawing Scale Scale Factor Viewport Scale
1/128″ = 1′-0″ 1536 1/1536xp
1/64″ = 1′-0″ 768 1/768xp
1/32″ = 1′-0″ 384 1/384xp
1/16″ = 1′-0″ 192 1/192xp
3/32″ = 1′-0″ 128 1/128xp
1/8″ = 1′-0″ 96 1/96xp
3/16″ = 1′-0″ 64 1/64xp
1/4″ = 1′-0″ 48 1/48xp
3/8″ = 1′-0″ 32 1/32xp
1/2″ = 1′-0″ 24 1/24xp
3/4″ = 1′-0″ 16 1/16xp
1″ = 1′-0″ 12 1/12xp
1 1/2″ = 1′-0″ 8 1/8xp
3″ = 1′-0″ 4 1/4xp
6″=1′-0″ 2 1/2xp
1′-0=1′-0″ 1 1xp

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  1. Robert Williams says:

    Excellent Info, thanks!! I’ve found that the decimal equivalents of each of those values can be equally handy; and in some cases more efficient.

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