Planning Resource
Electrical Load Calculator
Estimate potential demand for EV chargers, panel upgrades, remodels, spas, ADUs, dedicated circuits, and light commercial tenant improvements.
Preliminary planning tool
Use this estimate to flag potential capacity constraints before detailed design.
Built for common upgrade scenarios
Covers EV charging, panel upgrades, remodels, spas, ADUs, and commercial TI planning.
Licensed review required
Final sizing and code decisions should always be validated by a licensed electrician.
NEC 220.80 Load Calculation
Optional Method — Single Family Dwelling
Min Service
18.8A
Project Information
1. General Lighting Loads
NEC 220.12: 3 VA/sq ft
Min 2 required (NEC 210.11)
Min 1 required (NEC 210.11)
2. Cooking Equipment
3. Electric Dryer
Minimum 5,000 VA enforced for electric (NEC 220.54).
4. Fixed Appliance Loads
Other Fixed Loads
No custom fixed loads added yet.
7. Heating or AC Load
Only the larger of the two values is used in the final calculation (NEC 220.60).
Summary
NEC 220.80Section 6: Demand Factors
Min Service Size
18.8A
@ 240 Volts
This worksheet follows NEC 220.80 (Optional Method). Ensure all nameplate values are entered in Volt-Amps (VA). Final load calculations and service-sizing decisions require a licensed electrician.
Wheyland Electric
License # 940291 · Est. 2009
Single Family Dwelling
Property Address
ADDRESS NOT PROVIDED
Service Rating
200A
Bus Rating
225A
1. General Lighting Loads
2. Cooking Equipment
3. Electric Dryer
4. Fixed Appliance Loads
6. Demand Factors
7. Heating / AC (Largest)
Recommended Service
Engineering Reference: NEC 220.80
Generated 6/9/2026 — This worksheet follows NEC 220.80 (Optional Method). Ensure all nameplate values are entered in Volt-Amps (VA). Final load calculations and service-sizing decisions require a licensed electrician.
How to use this calculator
- Set your existing service size and estimated current utilization.
- Add expected loads for EV charging, remodel scope, ADU plans, spa equipment, and dedicated circuits.
- Review projected utilization and remaining capacity as a preliminary planning signal.
What this estimate can and cannot tell you
- Can: Help flag whether your project may justify licensed service-capacity review.
- Cannot: Replace permit design, final NEC calculations, utility coordination, or inspection outcomes.
- Next step: Book a site visit for verified load calculations and upgrade options.
Related Services
Electrical Panel Upgrades
Evaluate whether existing service can support current and future demand.
EV Charger Installation
Estimate added load before selecting charger size and circuit requirements.
Remodel & Rewiring (incl. ADU)
Plan additional electrical demand for major renovations and ADU expansions.
Commercial Tenant Improvement
Use as an early checkpoint for TI scope and service capacity review needs.
Related Resources
Need a licensed load review?
Get a field-verified recommendation for your panel, circuits, and project scope.