Firewood Heat & Burn-Time Calculator

Estimate usable heat and burn hours by wood type, moisture content, stove efficiency, firebox size, and split size.

Dry & seasoned wood matters most Split size changes burn rate

Wood species

Table uses common published “available heat per cord” style values for planning.

Moisture content: 20%

Most guidance targets ~20% MC (dry, split, well-seasoned).

Appliance efficiency

Usable heat = fuel heat × efficiency.

Firebox volume (cu ft)

Typical stoves: ~1.5–3.5 cu ft.

Load fill (%)

Split size

Target heat output

Note: Burn time is an estimate based on energy available and a chosen average output. Real-world results vary with draft, loading method, and how the stove is operated.

Estimate: —

Choose inputs and click Calculate.

Heat per cord

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Load weight

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Usable heat (load)

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Estimated burn time

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Burn-time class (quick guidance)

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Species	Type	lbs/cord	MMBTU/cord	Class

Table values are planning references; usable heat depends heavily on moisture and appliance efficiency.

Tip: A cord is 128 ft³ stacked (4×4×8). Dry, split, well-seasoned wood performs best.