WireCalc vs Wire Size Calc

The NEC wire sizing calculator that works where you work -- even with no signal. WireCalc gives electricians, contractors, and apprentices instant access to NEC 2023 wire sizing, voltage drop calculations, and conduit fill tables. No internet required. No subscription. Just accurate answers on the job site. STOP OVERSIZING WIRE. STOP GUESSING. Enter your load and run length. Get the correct wire gauge per NEC 310.16 in seconds. Check voltage drop. Verify conduit fill. Solve Ohm's law. All based on NEC 2023 (NFPA 70) tables. FEATURES: - Wire size calculator -- sizes by both ampacity AND voltage drop per NEC - Full NEC Table 310.16 ampacity reference (interactive, searchable) - Voltage drop calculator (single-phase and three-phase) - Conduit fill calculator with NEC Chapter 9 data (EMT, IMC, RMC, PVC) - Ohm's law calculator (V, A, Ohm, W -- enter any two, get all four) - Copper and aluminum conductor support - 60°C, 75°C, and 90°C temperature ratings - THHN, THWN, XHHW, TW, THW insulation types - Pass/fail indicators with NEC-compliant thresholds WHY ELECTRICIANS CHOOSE WIRECALC: - Works 100% offline -- designed for job sites with zero signal - No subscriptions, no ads, no account required - One-time purchase -- yours forever - NEC 2023 compliant tables and calculations - Large text and tap targets -- usable with work gloves Based on NEC 2023 (NFPA 70). Note: This app is a calculation tool and reference guide. It does not replace professional judgment or code compliance verification. Always verify calculations and consult local codes and amendments.

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.