Panel Load Calculator
Electrical Panel Load Calculation
Standard Calculation Method (NEC)
The standard method for calculating residential service load includes:
- General Lighting: 3 VA per square foot of living space
- Small Appliance Circuits: 1,500 VA each (minimum 2)
- Laundry Circuit: 1,500 VA
- Appliances: Nameplate ratings
- Motor Loads: 25% of largest motor
Load Centers
Common residential panel sizes:
- 100A - Small homes, apartments
- 150A - Medium homes, all-electric small homes
- 200A - Standard for most new homes
- 400A - Large homes, estates, with many electrical appliances
80% Rule
For continuous loads (3+ hours), the NEC requires the load not exceed 80% of the breaker or panel rating. This prevents overheating and ensures safe operation.
About Panel Load Calculator
Panel Load Calculator - Calculate Electrical Panel Capacity
Calculate electrical panel load and capacity instantly. Determine if your panel has adequate capacity for all circuits with NEC compliance checking.
How to Calculate Panel Load
- List all circuit breakers with their amperage and voltage
- Multiply amps × voltage for each circuit (use 125% for continuous loads)
- Sum all circuit VA values to get total panel load
- Divide by panel voltage to get total amperage
- Compare to main breaker rating (should be <= 80% for continuous loads)
Panel Load Calculation Formula
Total VA = Sum of (Circuit Amps × Circuit Voltage × 1.25 if continuous)
Total Amperage = Total VA / Panel Voltage
Load % = (Total Amperage / Main Breaker Rating) × 100Standard Panel Sizes
| Panel Size | Capacity (at 240V) | 80% Limit (Continuous) | Typical Use |
|---|---|---|---|
| 100A | 24,000 VA | 19,200 VA | Small homes, apartments, additions |
| 150A | 36,000 VA | 28,800 VA | Medium homes, small all-electric |
| 200A | 48,000 VA | 38,400 VA | Standard new homes, most renovations |
| 300A | 72,000 VA | 57,600 VA | Large homes, with significant electric demand |
| 400A | 96,000 VA | 76,800 VA | Estate homes, commercial residential |
Related Calculators
Calculate concrete volume for slabs, footings, columns, and tubes. Get accurate estimates in cubic yards, cubic meters, and bags needed.
Calculate paint and primer needed for interior and exterior projects. Estimate gallons, coats, and costs for walls, ceilings, and trim.
Calculate roofing materials, shingles, and costs instantly. Estimates for gable, hip, and flat roofs with waste factor included.
Calculate tile needs for floors, walls, and backsplashes. Get accurate estimates of tiles needed including waste percentage and grout coverage.
Calculate concrete blocks and mortar needed for walls. Estimate blocks, mortar bags, and costs for standard and custom block sizes.
Calculate concrete volume for slabs, patios, and footings. Get accurate estimates in cubic yards, bags, and cost for concrete pours.
Calculate sand volume and weight for construction projects. Estimate sand needed for concrete, landscaping, and playgrounds.
Calculate gravel volume and weight for driveways, pathways, and landscaping. Estimate tons and cubic yards needed.
Calculate asphalt needed for driveways, parking lots, and roads. Estimate hot mix asphalt volume in tons and cubic yards.
Calculate wallpaper rolls needed for any room. Estimate wallpaper, account for pattern repeats, doors, and windows.
Calculate carpet needed for rooms and stairs. Estimate carpet in square yards and square feet with waste factor included.
Calculate fence materials including posts, panels, pickets, and concrete needed. Estimates for wood, vinyl, and chain link fences.
Calculate decking materials including deck boards, joists, and screws. Estimate composite, wood, and PVC decking needs.
Calculate siding materials needed for your home. Estimate vinyl, wood, fiber cement siding in squares and linear feet.
Calculate electrical load for your home or office. Determine circuit capacity and prevent overloads.
Calculate drywall sheets needed for walls and ceilings. Estimate materials including tape, mud, and screws for your project.
Calculate your GPA instantly. Support for weighted and unweighted GPA. Multiple courses, cumulative GPA, and grade tracking.
Calculate your final grade with our free grade calculator. Determine what you need on your final exam to achieve your desired course grade.