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Baseboard Heater Size Calculator

Watts and linear feet for electric baseboard.

Inputs

Inputs and assumptions

Room floor area.

10 average, 12+ cold rooms or big windows.

Result

Heater length (ft at 250W/ft)
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Heater wattage (W)
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What to check

  • Room area
  • Window area and insulation

Related calculators

Rule-of-thumb screening estimate, not an ACCA Manual J calculation. Confirm with a room-by-room Manual J load calculation and installer quotes before buying equipment.

Saved calculations

Keep the assumptions with the result.

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