Electrical Calculators
Free tools for voltage drop, wire sizing, conduit fill, and more. For estimation only. Verify with the current NEC and a licensed electrician.
Voltage Drop
Wire & Ampacity
Conduit & Box Fill
Load & Service
Motors & Transformers
- Transformer kVA Sizing CalculatorSize a transformer based on secondary load current and voltage.
- Motor Full-Load Amps (FLA) CalculatorLook up NEC table FLA and calculate conductor and OCPD sizing for motors.
- Phase Imbalance CalculatorCalculate three-phase current imbalance percentage and check against NEMA limits.
Conversions
Reference charts
Use these as a starting point only. We are not liable for any decisions you make or how you use these tools in the real world. Verify with the current NEC and a licensed electrician before any real installation. Full disclaimer