Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Cords in the stack
0.67
Stack value
$200
Season heating cost
$900
Cost per million BTU
$21.43
Cubic feet
85
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter stack length (ft).
- 2Enter stack height (ft).
- 3Enter log length (stack depth) (ft).
- 4Enter price per cord ($).
- 5Enter cords burned per season.
- 6Enter stove efficiency (%).
- 7Read your cords in the stack on the right — it updates as you type.
- 8Hit Share to keep the scenario or send it to someone.
About this calculator
Convert a stack's dimensions into cords, estimate how many cords a heating season takes, and compare wood heat against your alternative fuel on a cost-per-BTU basis.
Worked example
Using the values the calculator loads with:
Inputs
- Stack length: 16 ft
- Stack height: 4 ft
- Log length (stack depth): 1.33 ft
- Price per cord: 300 $
- Cords burned per season: 3
- Stove efficiency: 70 %
Results
- Cords in the stack: 0.67
- Stack value: $200
- Season heating cost: $900
- Cost per million BTU: $21.43
- Cubic feet: 85
What each field means
Inputs
- Stack length (ft)
- The stack length used in the calculation, measured in ft. Starts at 16 ft so you have a working example on load.
- Stack height (ft)
- The stack height used in the calculation, measured in ft. Starts at 4 ft so you have a working example on load.
- Log length (stack depth) (ft)
- The log length (stack depth) used in the calculation, measured in ft. Starts at 1.33 ft so you have a working example on load.
- Price per cord ($)
- The price per cord used in the calculation, measured in $. Starts at 300 $ so you have a working example on load.
- Cords burned per season
- The cords burned per season used in the calculation. Starts at 3 so you have a working example on load.
- Stove efficiency (%)
- The stove efficiency used in the calculation, measured in %. Starts at 70 % so you have a working example on load. Accepted range: 20–95 %.
Results
- Cords in the stack
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Stack value
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Season heating cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Cost per million BTU
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Cubic feet
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What's a face cord?
A stack 4 ft × 8 ft with whatever log length you cut — typically a third of a full cord. Always ask for dimensions, not the word 'cord'.
Does wood species matter?
A lot. Oak and hickory carry 24–28 million BTU per cord; pine and poplar closer to 15.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Firewood Cord & Heating Cost Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/firewood-cord
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/firewood-cord" target="_blank" rel="noopener">Firewood Cord & Heating Cost Calculator — RevenueLab</a> (2026).</p>
Source: [Firewood Cord & Heating Cost Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/firewood-cord) (2026).