Heater Voltage / Wattage Calculator

Resistive Heater Calculator

Assumes constant resistance (heater elements).
Actual W = Rated W × (Applied V / Rated V)²

Inputs

Rated Wattage (W)

Rated Voltage (V)

Applied Voltage (V)

Actual Wattage at Applied Voltage (W)

Resistance at Rated Voltage (Ω)

Resistance at Applied Voltage (Ω)

Current Draw at Rated Voltage (A)

Current Draw at Applied Voltage (A)

Enter rated wattage, rated voltage, and applied voltage.

Note: Resistance is ideally constant, so the two resistance fields will match. Real elements vary slightly with temperature.