Cables, circuits & power systems

Electrical Engineering calculators

Calculators for cable sizing, voltage drop, circuit protection and power system design — metric mm² and AWG, for electricians and electrical designers anywhere.

• Voltage Drop Calculator
  Volts and percent dropped in the run, power lost in the cable, and the smallest conductor that still meets your limit.
• Cable Ampacity & Derating Calculator
  Your standard supplies the base rating and the correction factors; this applies the chain and tells you whether the cable still carries the load.
• Conduit Fill Calculator
  Fill percentage, spare capacity and jam ratio for any conduit and any mix of cables.
• Ohm's Law & Power Calculator
  Any two of V, I, R and P give you all four — with the full AC power triangle and energy over a run time.