HireLV Handbook › Conduit fill calculator

Conduit fill calculator

OD from the reference table (typical manufacturer values). Edit it to match the spec sheet. NEC-Ch9-2023.

62.3%

of 0.864 in² (1 EMT) · 8 cables → limit 40%

Over limit

Recommended size 1-1/4 EMT · 36.0% fill

For reference only. Verify against NEC Chapter 9 (Tables 1, 4 and 5) and the local AHJ. Limits: 1 cable 53%, 2 cables 31%, over 2 cables 40%.

Planning aid only. Values are typical and vary by manufacturer, code edition and jurisdiction. Verify with manufacturer data, NEC/NFPA/TIA and the local AHJ. HireLV is not liable for designs based on these tools.