Load Calc NEC 220 Service

NEC residential electrical load calculator for electricians, contractors, and electrical engineers. Calculate service size using the NEC 220.82 Optional Method with official NEC 2023 and NEC 2026 data — the only electrician app with current NEC 2026 support. This demand load calculator delivers code-compliant, permit-ready results with full step-by-step breakdowns and NEC article references. Works 100% offline for dwelling unit load analysis on any job site.

Whether you're sizing a 200A panel upgrade, planning an EV charger installation, or preparing a permit application, this electrical load calculator gives you accurate NEC-compliant results in seconds. Use it as your service size calculator for dwelling unit load calculations and panel sizing from 100 amp to 600 amp service - perfect for new construction and electrical renovations.

ELECTRICAL LOAD CALCULATOR FEATURES:
• NEC 220.82 Optional Method calculation
• NEC 2026 Article 120 support (load calc sections renumbered 220.x to 120.x)
• Toggle between NEC 2023 and NEC 2026 instantly
• Step-by-step breakdown with NEC article references on every line
• Heating & 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 electrical load
• General lighting auto-calculated from square footage per 220.41
• Small appliance & laundry circuits auto-added per 220.52
• HVAC non-coincident load handling (heating vs cooling)
• EV charger support (Level 2: 32A, 40A, 48A)

APPLIANCE PRESETS:
• Electric Range / Oven (8,000-16,000 VA)
• Clothes Dryer (5,000-5,500 VA)
• Water Heater (4,500 VA)
• Heat Pump (2-5 ton) / 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 load values

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

HOW THE LOAD CALCULATOR 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 load calculation line shows the exact NEC article reference (e.g. "NEC 220.82(B)" or "NEC 2026 120.82(D)"). You can verify every step against the official NEC code book. This builds trust with inspectors and helps with code exam preparation.

NEC 2026 UPDATES IN THIS LOAD CALCULATOR:
• 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)

PERFECT FOR:
• Licensed electricians doing residential load calculations
• Electrical apprentices studying for journeyman exams
• Electrical contractors bidding panel upgrades and service upgrades
• Electrical engineers and designers
• EV charger installation planning and electrical tool selection
• New construction electrical load calculations
• Permit applications with NEC references and code compliance verification

OFFLINE & PRIVACY:
• Works 100% offline - no internet needed on the job site
• No account required
• No data collection - all calculations stored locally
• Encrypted local storage

Simplify your residential load calculations on the job site.

Recent changes:
Added a link to TradeTools — the one-app version of this calculator and 61 more, for HVAC, electrical, plumbing, fire protection, solar and carpentry. Nothing else changed.