Calculate residential electrical service requirements using NEC Standard Method
Used to calculate general lighting load (3 VA/sq ft per NEC 220.12)
Kitchen/dining (1500 VA each)
1500 VA each
Appliances & Equipment
Or enter exact nameplate ratings:
Total Load
30,100 VA
Total Amperage
125.4 A
Recommended Service Size
150 A
84% of service capacity used
Load Breakdown
Note: This is an estimate based on NEC Standard Method. Actual requirements may vary. Always consult a licensed electrician for service upgrades and permit requirements.
Our electrical load calculator uses the NEC (National Electrical Code) Standard Method from Article 220 to estimate your home's electrical service requirements. This calculation helps determine whether your current electrical service is adequate or if you need a service upgrade.
The calculator applies proper demand factors as specified in the NEC, including the lighting demand factor table (220.42), cooking equipment calculations (220.55), dryer loads (220.54), and the non-coincident load rule for heating and cooling (220.60). This provides a realistic estimate rather than simply adding up all appliance ratings.
This tool is essential for homeowners planning major additions like EV chargers, hot tubs, or workshop equipment. It helps answer the common question: "Do I need a 200 amp service upgrade?" Understanding your electrical load is the first step in any major electrical project.
Follow these steps to calculate your electrical load: