Panel Load Calculator

Check current panel capacity utilization to see if you have room for new circuits.

Panel Used
— % of capacity
Connected load vs main.

Usage Tip

For a real service-upgrade decision, do a full load calculation; this ratio just flags whether you are close to the limit.

THE MATH
used % = total amps ÷ panel size × 100
A service panel has a main breaker rating. This quick check compares the connected amps to that rating to gauge how full the panel is before adding circuits.
Enter the total connected amps and the panel main rating.
This is a rough utilization check, not a full code load calculation with demand factors.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.