🔥 Wood Stove Heating Capacity Calculator
Estimate how many square feet a wood stove can heat, based on its rated BTU output and your climate zone.
One division, two judgement calls
The floor area a stove can hold at temperature is its hourly output shared out over the heat each square foot loses:
square feet = stove BTU/hr / climate factor (BTU per sq ft)A 60,000 BTU/hr stove on the moderate setting of 35 covers 60,000 / 35 = 1,714 sq ft. The same stove reaches 3,000 sq ft in a mild, well-insulated house at 20 BTU per sq ft, and only 1,200 in a draughty one at 50. Insulation moves the answer further than the stove rating does.
Picking the climate factor honestly
- 20 BTU per sq ft suits a modern, tight, mild-winter house. 35 is the everyday case. 50 is old construction, single glazing or hard frost.
- The factor assumes 8 ft ceilings. A vaulted room is heating volume you have not counted; add roughly a quarter for 10 ft.
- Heat does not turn corners. The figure describes an open plan. Closed doors, a staircase or a long hall will leave rooms cold however large the number says the stove is.
Frequently asked questions
What size wood stove do I need for 1,500 square feet?
About 52,500 BTU/hr in an average house, since 1,500 × 35 = 52,500. A well-insulated 1,500 sq ft home manages on 30,000, while a cold, leaky one wants 75,000.
How many BTU per square foot does heating take?
Between 20 and 50, depending on insulation, windows and outside temperature. 35 is the usual working figure, and it is the one the tool selects by default.
Why does my stove not heat the rated area?
Manufacturer areas come from lab tests with a full firebox of seasoned hardwood at maximum burn. Wet wood, a partly loaded firebox, closed interior doors or a poorly placed stove all cut the real coverage.