Below are two standard scale tables for Engineering and Architectural drawings.
To obtain the scale factor of an Engineering drawing scale:
- Multiply the feet of the desired scale by 12.
- 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:
- Multiply the denominator of the desired scale by 12.
- 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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