Induction Cooktop Amperage Calculator
Switching from gas to induction usually means a new dedicated circuit, and most advice online is conflicting forum guesswork. Enter your cooktop's power rating and voltage to get an estimated amperage, breaker size, and wire gauge. Nothing uploaded.
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Important
Always verify against your specific cooktop's nameplate rating and local electrical code - have a licensed electrician confirm before installing. This is an estimate, not an electrical inspection.
Induction Cooktop Electrical Circuit Sizing
The 25% Continuous-Load Rule
A 7.2 kW cooktop at 240V calculates to 30 amps raw (Power = Volts × Amps). But electrical code (NEC 210.19) requires continuous-load circuits to be sized at 125% of the calculated draw. So you need a 37.5-amp circuit, which rounds up to a standard 40-amp breaker, and 8 AWG copper wire to safely carry 40 amps without overheating.
Wire Gauge and Breaker Mismatch
Breakers protect the wire from overheating, not the appliance. A 40-amp breaker must be paired with 8 AWG wire rated for 40 amps. Using thinner wire (say, 10 AWG) with a 40-amp breaker is a fire hazard - the wire will overheat before the breaker trips. Always match your wire gauge to the breaker size you're installing.
FAQ
Why add a 25% safety margin to the calculated amperage?
Electrical code (NEC 210.19) requires that circuits supplying continuous loads (loads that run 3+ hours) be sized 125% of the actual load. Induction cooktops are continuous loads by definition, so a 7.2 kW cooktop at 240V draws 30 amps raw, but you need a breaker and wire rated for 37.5 amps (30 × 1.25), rounding up to a 40-amp breaker.
Why can't I just use the nameplate amperage directly?
Nameplate amps are often listed as a maximum rating under specific conditions. Real-world installation requires the safety margin, existing building code compliance, and accounting for voltage drops over longer runs. Always check both the nameplate and the calculated requirement.
What if my panel doesn't have enough spare capacity?
You'll need a panel upgrade, which is beyond DIY territory - a licensed electrician will evaluate your main service, potentially increase the main breaker, and assess whether your utility service can handle the higher load. Budget $800-2,500+ for a panel upgrade depending on your location and the work needed.