As a general guide we have the following table showing the dimensions of a marquee, the number that they are suitable for based on different sitting types and tables.
| Dimensions (ft) | Seated (5 ft round tables) | Seated (in chairs) | Seated (long tables) |
| 12 x 12 | 12 | 25 | 15 |
| 20 x 20 | 30 | 40 | 34 |
| 40 x 20 | 70 | 140 | 85 |
| 40 x 40 | 130 | 320 | 175 |
| 60 x 40 | 200 | 480 | 265 |
| 80 x 40 | 260 | 640 | 355 |
| 100 x 40 | 330 | 800 | 445 |
| 120 x 40 | 400 | 960 | 535 |
You can also work out the size by using this rule of thumb:
- - 8 sq ft per person for events whereby there is a buffet
- - 15 sq ft for events where guests will be seated
- Then you must take into account the additional space you may need for things such as a DJ, dance floor, etc