NEC Wire Ampacity Calculator

Determine allowable ampacity per NEC Table 310.16 with temperature and conduit fill correction factors.

Wire gauge. Use 14-1 for standard, 0.5=1/0, 0.33=2/0, 0.25=3/0, 0.2=4/0.
AWG
Ambient temperature in °C.
°C
Total current-carrying conductors in raceway.
75 or 90°C rated insulation.
°C

Results

Base Ampacity-A
Temperature Correction-
Conduit Fill Correction-
Corrected Ampacity-A
References: NEC 2023 Table 310.16; NEC Table 310.15(C)(1); NEC Table 310.15(B)(1)