About ToolSite
A free firewood calculator built on real BTU science — so you order the right amount of wood, every season.
Why We Built This
Ordering firewood shouldn’t be a guessing game. Most homeowners estimate based on what they bought last year, a neighbor’s suggestion, or a round number that feels about right. The result is predictable: either a frantic call for more wood in January, or a full cord aging in the yard through spring.
We built Firewood Calculator to close that gap. The tool uses published BTU ratings per cord from university forestry extensions — the University of Nebraska-Lincoln Extension and the University of Maine Cooperative Extension — combined with appliance efficiency data from the U.S. EPA’s Burn Wise program and heat-loss baselines from ASHRAE guidelines. These aren’t estimates we invented; they’re the same data professional energy auditors use.
The calculator takes four inputs that actually matter: home size, heating season length, wood species, and appliance type. Get those right and the cord count follows directly from the math. No guesswork, no rules of thumb that don’t account for whether you have an open fireplace or an EPA-certified stove.
Niche-Specific Expertise
Every piece of content on this site — the calculator, the blog, the FAQ — is written specifically about firewood and home heating. We don't cover 50 topics; we cover this one well.
Cited Sources Only
BTU ratings, efficiency numbers, and heat-loss factors come from named, verifiable sources: UNL Extension, University of Maine, EPA Burn Wise, and ASHRAE. We cite on every calculation page.
Accurate Calculations
The formula is transparent: BTU needed = area × insulation factor × months, divided by (BTU/cord × appliance efficiency). You can verify it against the same sources we use.
Free, No Strings
No signup required. No upsells. No ads interrupting the calculation. Just a tool that gives you a number you can actually use when you call your firewood supplier.
How We Research and Verify
The calculator’s BTU values are cross-referenced against at least two independent university sources before being published. Appliance efficiency ranges follow EPA Burn Wise documentation and are updated when the EPA revises its standards. Insulation factors align with ASHRAE Standard 90.1 residential baselines.
Blog posts are written to complement the calculator — each article provides practical context that the calculator alone can’t give you: why species choice matters, how to verify you’re getting a full cord, when to buy, how to store. Every factual claim in blog posts is verified against the same sources used in the calculator, plus additional references from Cooperative Extension Services and the National Fire Protection Association (NFPA).
We update content when data changes. The lastUpdated date on every page reflects when the content was last reviewed, not just when it was first published.
Get in Touch
Found a calculation error, want to suggest a new feature, or have a question about firewood? We read every message.
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