Electrical Contractor Tools
Free Tools Built for Electricians
Stop wrestling with spreadsheets. Our calculators follow NEC standards and give you professional results in minutes — not hours.
Residential Load Calculator
Calculate the total electrical service load for a single residential dwelling unit per NEC Article 220. Enter square footage, appliances, and circuits — get your service size instantly.
- General lighting & receptacle loads (NEC 220.12)
- Small appliance and laundry circuits (NEC 220.52)
- Fixed appliance loads with demand factors
- HVAC vs electric heat comparison (NEC 220.60)
- Service size recommendation (100A, 150A, or 200A)
How It Works
1
Enter Your Info
Plug in square footage, appliances, and major loads. The form guides you through each section.
2
We Calculate
Demand factors, derations, and NEC rules are applied automatically. No manual lookups needed.
3
Get Your Results
View your total calculated load and recommended service size. Save it or print for your records.
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