Electrical & Lighting Calculators
Electrical sizing is about heat and safety margins. These calculators estimate electrical load and breaker size, pick a wire gauge by ampacity, check conduit and cable tray fill, size a generator transfer switch, and lay out recessed lights. Each shows its method and assumptions. They are for planning and learning: electrical work must meet your local code and should be done or inspected by a licensed electrician.
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All Electrical & Lighting Calculators
Cable Tray Fill & Sizing Calculator
Calculate cable tray fill percentage and find the right tray size for your cables. NEC-compliant cable tray fill calculator for electricians and engineers.
Ceiling Recessed Lighting Layout Calculator
Calculate the perfect recessed lighting spacing and layout for any room. Get exact fixture positions, spacing recommendations, and a visual grid — free online tool.
Conduit Fill Calculator
Calculate conduit fill percentage instantly. Add multiple wire sizes, select conduit type and size, and get NEC-compliant fill results for EMT, PVC, and more.
Electrical Load & Circuit Breaker Calculator
Calculate electrical load, amperage, and recommended circuit breaker size instantly. Free online electrical load calculator for homes, workshops, and job sites.
Generator Transfer Switch Load Calculator
Calculate the right generator size for your house. Add appliances, get total wattage, and find the perfect transfer switch size — free & instant.
Wire Gauge & Ampacity Calculator
Calculate wire gauge ampacity, find the right AWG wire size for your current load, voltage drop, and circuit type. Free online wire gauge ampacity calculator.