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 50x12 = 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 4x12 = 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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