Load Calculator - NEC 220

ZkDev

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About this app

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. Get permit-ready results with full step-by-step breakdowns and NEC article references. Works 100% offline.

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 400 amp service.

ELECTRICAL LOAD CALCULATOR FEATURES:
• NEC 220.82 Optional Method calculation
• NEC 2026 Article 120 support with updated demand factors
• Toggle between NEC 2023 and NEC 2026 instantly
• Step-by-step breakdown with NEC article references on every line
• Service size recommendation: 100A, 200A, or 400A
• PASS/FAIL check against existing panel capacity
• 26 common appliance presets with VA ratings
• Custom appliance entry for any electrical load
• General lighting auto-calculated from square footage
• Small appliance & laundry circuits auto-added per NEC
• HVAC non-coincident load handling (heating vs cooling)
• EV charger support (Level 2, 40A and 50A)

APPLIANCE PRESETS:
• Electric Range / Oven (8,000–16,000 VA)
• Clothes Dryer (5,000–5,500 VA)
• Water Heater (4,500 VA)
• Heat Pump / Central AC (by tonnage: 2–5 ton)
• EV Charger Level 2 (7,680–9,600 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)(1)"). 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
• Article restructured as Article 120

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

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.

What’s new

• Cross-promotion: discover our other NEC calculator apps
• In-app review for easier rating
• Firebase Analytics for better app experience
• Dynamic version display in settings
• Bug fixes and performance improvements