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The following table lists standard waveguide sizes of interest for 24 and 47GHz.
| WG | EIA | IEC | Rec. freq. | Cutoff | Internal | Wall | |
| no | desig. | desig. | range GHz | freq | size (mm) | (mm) | |
| WG19 | WR51 | R180 | 15.0-22.0 | 11.57 | 12.95 x 6.477 | 1.016 | |
| WG20 | WR42 | R220 | 18.0-26.5 | 14.05 | 10.67 x 4.318 | 1.016 | |
| WG21 | WR34 | R260 | 22.0-33.0 | 17.36 | 8.636 x 4.318 | 1.016 | |
| WG22 | WR28 | R320 | 26.5-40.0 | 21.08 | 7.112 x 3.556 | 1.016 | |
| WG23 | WR22 | R400 | 33.0-50.0 | 26.34 | 5.690 x 2.845 | 1.016 | |
| WG24 | WR19 | R500 | 40.0-60.0 | 31.39 | 4.775 x 2.388 | 1.016 |
Abbreviations:
EIA - Electronic Industries Association (USA).
IEC - International Electrotechnical Commission