Calculate the total electrical load for your home or building to determine if your electrical panel has sufficient capacity. Enter your major appliances and general lighting/receptacle loads to see the total demand in amps and watts.
Enter Your Measurements
Results
Total Load
140
amps (240V)
Total Demand
33,625
watts
Recommended Panel Size
150
amps
General Load (demand)
5,625
watts
Formula
How to Use This Calculator
How to Use
- 1
Enter the home square footage for general lighting load calculation.
- 2
Indicate which major electric appliances are present.
- 3
Enter the central AC tonnage (0 if no central AC).
- 4
The calculator uses NEC demand factors to estimate total load.
Frequently Asked Questions
Frequently Asked Questions
What size electrical panel do I need?
How many amps does a house use?
In-Depth Guides
Electrical Panel Sizing Guide: How Many Amps Do You Need?
Calculate how many amps your home needs. Learn when to upgrade your electrical panel, cost to upgrade, and how to calculate electrical load.
Electrical Panel Upgrade Cost: 100A to 200A and What's Involved
How much it costs to upgrade an electrical panel in 2026, when you need an upgrade, and what the process involves — including permits and utility coordination.
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About This Calculator
This calculator uses the formula: General Load = (Sq Ft × 3W) + 3000 + 1500 | Demand = 3000 + (Remainder × 35%) | Total = Demand + Appliance Loads. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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