Electrical Load Calc NEC

NEC residential electrical load calculator for electricians, contractors, and electrical engineers. Size electrical services with confidence using the NEC 220.82 Optional Method and updated NEC 2026 Article 120 demand factors. Works 100% offline on the job site.

Enter dwelling square footage, pick appliances from presets, and get a permit-ready service-size recommendation in seconds - with a full step-by-step breakdown and NEC article references on every line. Switch between NEC 2023 and NEC 2026 instantly to see how the new rules change your load.

LOAD CALCULATION FEATURES:
- NEC 220.82 Optional Method for dwelling units
- NEC 2026 Article 120 support (load calc sections renumbered 220.x to 120.x)
- Toggle between NEC 2023 and NEC 2026 in one tap
- Step-by-step breakdown with NEC article references per line
- Heating and A/C per 220.82(C): A/C and heat pump compressor at 100%, supplemental heat at 65%, electric space heating at 65% (under 4 units) or 40% (4 or more units)
- EVSE per edition: 2023 as general load per 220.57 and 220.82(B) with 7,200 VA minimum; 2026 at 100% per 120.82(D)
- Service size from standard ratings: 100A, 125A, 150A, 200A, 225A, 300A, 400A, 600A
- PASS/FAIL check against existing panel capacity
- 29 common appliance presets with VA ratings
- Custom appliance entry for any load
- General lighting auto-calculated from square footage per 220.41
- Small appliance and laundry circuits added per 220.52
- HVAC non-coincident load handling (heating vs cooling)
- EV charger support (Level 2: 32A, 40A, 48A)

APPLIANCE PRESETS INCLUDED:
- Electric range and oven (8,000-16,000 VA)
- Clothes dryer (5,000-5,500 VA)
- Water heater (4,500 VA)
- Heat pump (2-5 ton) and central AC (2-5 ton)
- Supplemental heat strips (5 kW, 10 kW) for heat pump systems
- EV charger Level 2 (7,680-11,520 VA)
- Dishwasher, disposal, microwave
- Pool pump, hot tub, well pump
- And more - or enter custom VA values

PRO FEATURES (one-time purchase):
- No ads - clean interface for professionals
- Save calculation history by job or address
- Export permit-ready PDF with full load breakdown
- Dark theme support

NEC 2026 UPDATES COVERED:
- General lighting reduced to 2 VA/sq ft (was 3 VA/sq ft)
- First tier demand reduced to 8,000 VA (was 10,000 VA)
- EV chargers at 100% demand factor per 120.82(D)
- Article 220 relocated to Article 120 (220.82 is now 120.82)

HOW IT WORKS:
1. Enter dwelling square footage
2. Select NEC edition (2023 or 2026)
3. Add appliances from presets or custom entry
4. See total demand in amps with NEC article references
5. Get recommended service size instantly

NEC ARTICLE REFERENCES:
Every calculation line shows the exact NEC article reference (for example "NEC 220.82(B)" or "NEC 2026 120.82(D)"). Verify every step against the official NEC code book, build trust with inspectors, and prep for the electrical exam.

PERFECT FOR:
- Licensed electricians sizing residential services daily
- Electrical apprentices studying for journeyman exams