Firewood Cord Calculator

Frequently Asked Questions

How much firewood do I need for a winter?

A home heated mostly by wood often burns 3-6 cords a season. An occasional weekend fireplace might use under a cord. The range is wide because it depends on house size, insulation, climate, wood species, and how often you run the fire.

How can I tell if firewood is properly seasoned?

It is lighter than it looks, the bark loosens, the ends show radial cracks from drying, and two pieces knock together with a hollow ring rather than a dull thud. A moisture meter reading below 20% on the cut end is the most reliable test.

Why measure piece depth?

The depth of each split piece is what turns a tidy-looking single row into a fraction of a cord. It is the dimension sellers most often leave vague. Always ask for the piece length and multiply it yourself to verify the cord fraction before paying.

Which wood species burns the best?

Dense hardwoods - oak, hickory, maple, ash, and birch - pack the most heat per cord and produce long-lasting coals. Softer woods like pine and poplar ignite easily and are excellent kindling, but they burn faster and produce more creosote deposits in the flue if not fully dry.

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Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

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How This Calculator Works

Firewood is sold by the cord, a legally defined volume of 128 cubic feet of stacked wood - the classic 4 ft × 4 ft × 8 ft pile. The trouble is that almost nobody's actual stack matches those dimensions, and sellers sometimes exploit the confusion with vague 'truckloads' and 'face cords' that hold far less. This calculator measures your real stack - its visible length and height plus the depth of the split pieces - and tells you exactly what fraction of a true cord you have, so you can check a delivery against what you paid for. It also estimates the rough dry weight and approximate piece count by wood species, and offers seasoning guidance, because freshly cut 'green' wood is half water and burns poorly until it has dried.

Formula and Method

Stack volume (cubic feet) = length (ft) × height (ft) × (piece depth in ÷ 12). Cords = volume ÷ 128, because a full cord is 128 cubic feet of neatly stacked wood. A stacked cord is mostly wood but includes air gaps, so the solid wood is roughly 80 cu ft (≈ 80% of the stacked volume). Weight = cords × the species dry-weight-per-cord (oak ≈ 3,700 lb, maple/birch ≈ 3,300 lb, pine/fir ≈ 2,500 lb, all air-dried). Piece count ≈ solid volume ÷ 0.08 cu ft per average split.

A face cord is one row 4 ft high and 8 ft long but only as deep as the pieces - so a 16-inch face cord is just one-third of a real cord.

Worked Example

A stack 8 ft long, 4 ft high, with pieces cut 16 in (1.33 ft) deep. Volume = 8 × 4 × 1.33 ≈ 42.7 cubic feet, which is 42.7 ÷ 128 = 0.33 cord - exactly one face cord, or a third of a full cord. If a seller called that 'a cord' you would be paying triple. In oak it weighs roughly 0.33 × 3,700 ≈ 1,230 lb dry and contains on the order of 425 average splits. To get a full cord at 16-inch depth you would need three such rows stacked front to back, or a single row 24 ft long.

Seasoning and Wood Species

Most hardwoods need 6-12 months of drying after splitting, and dense oak often wants a full 1-2 years to drop below the ~20% moisture content that burns cleanly. Softwoods like pine can be ready in 6 months. Split it, stack it off the ground with the top covered but the sides open to airflow, and check with a cheap moisture meter - the cut ends should read under 20%.

Seasoned wood signs: lighter than it looks, bark loosens, ends show radial cracks, two pieces knock together with a hollow ring rather than a dull thud.

Best burning species: Dense hardwoods - oak, hickory, maple, ash, birch - pack the most heat per cord and burn long.

Softwoods: Pine and fir light fast and are great kindling but burn quickly and leave more creosote if not fully dry.

Common Mistakes and Buying Tips

Confusing a face cord (one row, piece-deep) with a full cord (128 cu ft) - the single most common firewood overcharge.

Measuring loosely thrown wood as if it were neatly stacked; a tossed pile holds maybe 30% less wood per cubic foot.

Burning green wood - freshly cut wood is 40-50% water, wastes most of its heat boiling that water off, and coats the chimney with creosote.

Buying by 'truckload' or 'rick' - undefined terms; always convert to cords before paying.

Ignoring species - a cord of pine has barely more than half the heat of a cord of oak, so price per cord is not the whole story.

Stack on pallets or rails to keep the bottom row off wet ground. Cover only the top so trapped moisture can escape. Always check a delivery's real cubic footage against the cord you paid for before the truck leaves.

Firewood Cord Calculator

Frequently Asked Questions

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