NEC Load Calculator Tool – Fast, Accurate NEC 220 Sizing

Load Calculations Simplified

Load calculations often mean juggling multiple NEC tables and demand factors. The NEC Load Calculator brings it all together in one streamlined, easy-to-use worksheet:

• Floor area lighting load (VA/ft²)

• Small-appliance & laundry circuits

• Fixed appliances and demand factors

• Range & dryer (simple single-unit handling)

• HVAC “largest of heat/cool”

• EV charging (continuous @125%)

• Suggested service amperage at 240 V

Why Pros Choose This Tool

Feature list

1. NEC 220 Engine – Uses standard NEC demand-factor logic for dwellings/light-commercial.

2. Fast Inputs – Floor area, circuit counts, nameplate VA/kW; done.

3. Clear Outputs – Total VA, calculated service amps, suggested service size.

4. Permit-Friendly – Outputs are organized for quick plan review.

5. Protected Formulas – Inputs unlocked, formulas hidden (password: engineer).

6. Excel & Sheets – Works in Microsoft Excel and Google Sheets.

Included NEC Categories

• General lighting (VA per sq ft, demand applied)

• Small-appliance + laundry (minimums enforced, demand applied)

• Fixed appliances (75% when 4+ fastened-in-place)

• Cooking equipment (simple single-range handling)

• Dryer (100% of nameplate)

• HVAC (largest of heat or cool)

• EVSE (continuous load @125%)

Note: Always verify local amendments and project-specific AHJ guidance.

Three Simple Steps

1. Enter Inputs – Floor area, circuit counts, appliance/range/dryer VA or kW, HVAC VA, EVSE kW, and service voltage.

2. Review Results – The tool applies applicable demand factors and outputs total VA, amps, and suggested service size.

3. Attach to Submittals – Export or print for a clean, permit-ready appendix.

Designed for Professionals by Professionals

• Electrical contractors & designers

• Solar + storage firms needing service calcs

• Residential/light-commercial design-build teams

• Plan reviewers and inspectors (as a quick check)

Your Download Includes

• NEC 220 Load Calculator (Excel) – Inputs unlocked; formulas protected

• Notes tab – NEC references summarized for quick context

• Branding – Evergreen Off-Grid, LLC professional look

Get Code-Aligned Load Calcs — Fast