Free tools

Electrical calculators.

Handy, no-nonsense calculators for homeowners, builders and trades. Everything runs right here in your browser — nothing is sent anywhere. Not sure on a result? Get a real quote →

⚡ Voltage drop

Material

Wire size (AWG)

System voltage

Phase

Load current (amps)

One-way length (ft)

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🔌 Wire size & ampacity

Copper, 75°C (NEC 310.16 / CEC typical). Always confirm against derating + the code in force.

Required current (amps)

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AWG	Amps (Cu 75°C)

📏 Conduit fill

≤2 wires 31% · 3+ wires 40% (NEC Ch.9). THHN approx. areas.

Conduit (EMT) size

Conductor size (AWG, THHN)

Number of conductors

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🧮 Ohm’s law & power

Enter any two; we'll solve the rest.

Volts (V)

Current (A)

Resistance (Ω)

Power (W)

Enter any two values

🏭 kVA ↔ Amps

Phase

Voltage (V)

kVA

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🚗 EV charging time

Battery to add (kWh)

Charger output (kW)

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💡 Running cost

BC Hydro residential ≈ $0.11–0.14 / kWh.

Power (watts)

Hours per day

Price ($/kWh)

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These calculators are for estimating and education only — not a substitute for a licensed electrician or the electrical code in force (CEC / your local AHJ). Verify all results before doing any work.