Redo Energy
Electrical Panel Calculator · Beta · NEC Load Calc

Can your panel handle
going electric?

Enter your current panel and the upgrades you want. We'll run an NEC Article 220 load calculation to tell you if you need a panel upgrade, a smart panel, or nothing at all.

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US-style electrical panel with breakers
1
Your Panel

    Used only for electricity rates. Nothing is stored.

    Select your utility to use its actual rate instead of the state average.

    sq ft
    60A
    100A
    125A
    150A
    200A
    400A (320A meter, often two 200A panels)

    Check the main breaker in your panel box. Most homes built after 2000 are 200A. Two 200A main breakers, or two 200A panels fed from one meter, are a 400A service; its meter is often labeled 320A.

    120/240V Split Phase

    Standard US residential.

    Pre-1970
    1970s–80s
    1990s–2000s
    2010s+
    Don't know
    2
    Current 240V Loads

    Toggle on what's already connected to your panel. Adjust amps if you know the exact breaker size.

    3
    What You Want to Add

    Toggle on the upgrades you're considering. Search for specific models to use exact electrical specs.

    4
    Heavy 120V Loads (optional)

    How many of these do you run at the same time? We use typical amp draws to approximate the load.

    Space heaters, oil-filled radiators, baseboard heaters, hair dryers (nearly all 1,500W)
    Window & portable ACs, dehumidifiers, large fans

    Current Panel Utilization

    After Your Upgrades

    Load Breakdown

    Current Loads

    LoadDemand

    Planned Upgrades

    LoadDemand

    Assumptions & Methodology

      5
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