Firewood Calculator

This calculator works out how much firewood a New Zealand household needs for winter and what that wood should cost, so you can order the right amount rather than running short or over-ordering and wasting money. You enter how many nights a week you typically burn the fire, how many weeks the heating season lasts, and roughly how many cubic metres a single night's fire uses, and the calculator estimates your total seasonal volume. You then enter the price per cubic metre charged by two suppliers, and the tool returns the estimated volume needed for the season, the total cost from each supplier, and how much you would save by choosing the cheaper one. This makes it easy to compare quotes on a genuine like-for-like basis, rather than being caught out by suppliers who sell by different measures, such as a thrown cubic metre versus a stacked one. When buying, confirm which measure a price refers to, and choose dry, well-seasoned wood over green wood, since it burns hotter, produces less smoke, and gives you more heat for your money. Storing wood under cover once delivered helps keep it that way. The cubic metres per night figure is a rough guide and will vary with your burner and house size, so treat the results as an estimate for planning rather than an exact order quantity.

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Cubic metres per night is a rough guide; a typical evening fire uses a small fraction of a cubic metre. Firewood is sold thrown or stacked, which differ, so compare on the same measure. Buy dry, seasoned wood and store it under cover. Estimate only.