Wire Size Calc
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Description
NEC wire size calculator for electricians, apprentices, and electrical engineers.
Determine the correct wire gauge (AWG/kcmil) for any circuit using official NEC 2023 ampacity tables and derating factors. Supports continuous and non-continuous loads, copper and aluminum conductors, 6 insulation types, and both conduit and free air installations. No internet required - works 100% offline on the job site.
FEATURES:
Continuous and non-continuous load sizing (125% factor)
5 voltage presets: 120V, 208V, 240V, 277V, 480V
Single-phase and three-phase support
Copper and aluminum conductors: 14 AWG through 2000 kcmil
AWG and mm² (metric) display toggle
6 insulation types: THHN, THW, TW, XHHW-2, NM-B, USE-2
Conduit and free air installation methods
Temperature correction factor (NEC 310.15(B)(1))
Conduit fill adjustment factor (NEC 310.15(C)(1))
Termination rating check (60°C / 75°C per NEC 110.14(C))
Overcurrent protection sizing (NEC 240.4(D))
Optional voltage drop check when distance is provided
PASS/FAIL indicator for quick compliance check
NEC REFERENCES:
Table 310.16 - Ampacity in conduit/raceway
Table 310.17 - Ampacity in free air
Table 310.15(B)(1) - Temperature correction factors
Table 310.15(C)(1) - Conduit fill adjustment factors
NEC 110.14(C) - Termination temperature limits
NEC 240.4(D) - Small conductor overcurrent protection
PRO FEATURES (one-time purchase):
No ads
Save calculation history
Export calculations as PDF reports
Dark theme support
BUILT FOR THE JOB SITE:
This app is designed by electricians, for electricians. Enter your circuit parameters, get the recommended wire size instantly - no complicated menus or unnecessary features. One-hand operation, instant results.
HOW IT WORKS:
1. Enter load current in amps
2. Select load type (continuous or non-continuous)
3. Choose voltage, phase, conductor material, insulation type
4. Set installation method and ambient temperature
5. Get recommended wire size with full derating breakdown
The calculator automatically applies:
125% continuous load factor
Temperature correction for ambient conditions
Conduit fill adjustment for conductor count
Termination temperature limit verification
Standard breaker size selection
PERFECT FOR:
Licensed electricians
Electrical apprentices
Electrical engineers and designers
Electrical contractors
NEC code exam preparation
Journeyman and master electrician exams
OFFLINE & PRIVACY:
Works 100% offline - no internet needed
No account required
No data collection
Your calculations stay on your device
Simplify your wire sizing on the job site.