How Many Cubic Metres of Firewood Do You Need for Winter with a Wood Burner?

Wood heating can create a welcoming atmosphere, reduce reliance on fossil fuels and provide a degree of self-sufficiency. However, getting your firewood order wrong could leave you cold in February or paying too much in October. This guide explains how to calculate the cubic metres of firewood needed for an entire winter with a wood burner or insert.

What a “stère” really means for your log pile

In France, firewood is often measured in “stères”, a unit broadly referring to one cubic metre of logs stacked in one-metre lengths. While this appears straightforward, the pile delivered to your drive may not match that neat definition.

Most current wood burners and inserts cannot accommodate one-metre logs. Merchants therefore commonly cut them to 50 cm, 33 cm or even 25 cm. Shorter pieces fit together more closely when stacked, so although the quantity of wood is unchanged, it takes up less visible space.

A “stère” is officially 1 m³ of one‑metre logs, but once cut shorter, the same wood may only occupy around 0.7–0.8 m³ on your floor.

When purchasing firewood in the UK or US, you will more often encounter descriptions such as “cubic metre bag”, “loose cubic metre” or “cord”. In North America, a cord traditionally measures 3.62 m³ of neatly stacked logs, measuring 4 ft high, 4 ft deep and 8 ft long. Always confirm whether the supplier’s stated quantity is stacked or loose-tipped, as well as the length of the logs. This seemingly minor information can significantly affect how long the delivery lasts over winter.

The big factors that decide how much wood you burn

No two households use an identical volume of firewood. Five main considerations determine whether five cubic metres will see you through winter or whether you will get through twelve.

Home size and volume

Warming a compact 60 m² bungalow is very different from heating a 180 m² farmhouse with tall ceilings. Floor space is not the only consideration: ceiling height and open-plan rooms also increase the volume of air that needs heating.

A typical modern, well-insulated 90–110 m² home using a wood burner as main heat source often needs around 5–7 m³ of properly seasoned hardwood per year.

In older homes with draughty windows and high rooms, that requirement can readily be twice as high.

How well your home holds heat

Insulation usually influences firewood use more than any other single factor. A properly insulated property retains warmth from the stove for longer, so fewer logs are required.

• Properties with effective loft insulation, cavity or solid-wall insulation, and double glazing can use 30–50% less wood than otherwise similar poorly insulated homes.
• Straightforward improvements, including sealing draughts around doors, chimneys and floorboards, can visibly reduce log consumption.

Type and efficiency of your appliance

An open fire may look impressive, yet much of its heat escapes through the chimney. A modern wood burner or enclosed insert performs quite differently.

Appliance type	Typical efficiency	Impact on wood use
Open fire	20–30%	Uses substantial wood to provide limited room heat
Older stove (pre-eco design)	50–70%	Delivers reasonable heat but consumes more logs
Modern eco‑design stove or insert	75–85%+	Extracts more heat from every log, requiring less wood

If your appliance is more than 15–20 years old, replacing it may lower your yearly firewood requirement while also improving air quality both indoors and outside.

Type of wood you burn

Logs do not all provide the same performance. Dense hardwoods contain more energy per cubic metre and tend to burn for longer.

• Hardwoods including oak, beech, ash and hornbeam suit sustained heating. They burn slowly, produce consistent embers and provide strong heat.
• Softwoods such as pine and spruce ignite easily and burn fiercely, but are used up quickly, resulting in more visits to the log store.

For a main heating system, combining softwood for kindling and lighting with hardwood for the long burn offers a good balance of convenience and efficiency.

Climate and how you actually use the stove

Homes in milder coastal areas may only light their stove for three or four months. In colder inland or northern locations, however, the heating period may extend to six or seven months. Daily routines matter as well: working from home, heating spaces throughout the day or running the stove until late at night will all increase wood consumption.

How many cubic metres for your style of use?

After considering your property and habits, you can identify a more realistic firewood range.

Occasional, “cosy evening” use

If the stove is lit mainly at weekends and on a handful of weeknights, while another system supplies the main heating, you will fall into the lowest usage category.

For decorative or occasional comfort use, plan for around 1–3 m³ of seasoned hardwood for the whole winter.

This amount is appropriate for small to medium-sized, well-insulated homes where the stove is used several times each week.

Regular backup heating

Many households use a wood burner as significant supplementary heating, reducing demand on gas, oil or electric systems, particularly during the coldest weather.

A broad estimate in this situation is:

• 3–6 m³ per winter for a 80–120 m² reasonably insulated home
• Towards the upper end of this range where the property is older or the location is colder

Main or near‑main heat source

If a wood burner or insert provides the principal heating, the size of your log pile is crucial. A shortfall can result in discomfort or the costly use of emergency electric heaters.

For full-time wood heating, most households fall somewhere between 5 and 12 m³ of dry hardwood per winter, depending on size, insulation and appliance efficiency.

A small, modern and highly insulated semi-detached house may require close to 5 m³. By comparison, a large, old rural property with high ceilings and an average stove may easily need 10–12 m³, especially during more severe winters.

Practical tips to cut your wood needs without feeling the cold

Using fewer logs does not need to mean turning down the heating and being uncomfortable. A number of practical, modest measures can make a substantial difference.

• Only burn dry wood: Target moisture content below 20%. Damp logs turn energy into steam rather than heat, while also producing more soot and creosote in the flue.
• Check your burn: Rapidly blackened stove glass and dense chimney smoke can indicate poor combustion or wet wood.
• Service and sweep regularly: A clean stove and flue support better draught and combustion. In many countries, an annual sweep is a legal safety requirement.
• Size logs to the appliance: Consistently sized, shorter logs fit more effectively in the firebox and burn more efficiently.
• Use the controls properly: Restricting the air supply too much for an entire evening creates tar deposits and reduces heat output. It is better to burn with healthy flames before allowing the embers to do their work.

Storing your winter wood: where the real savings start

Firewood storage often determines whether you benefit from all the energy in your logs. Even properly cut hardwood can perform like a wet sponge if it is placed directly on damp ground and tightly wrapped in plastic.

Good storage means air, protection from rain, and time - ideally at least 18–24 months’ seasoning for many hardwoods.

Raise the stack off the ground using pallets or rails. Protect the top with a solid roof, sheet or tarpaulin, but keep the sides open to allow air to circulate. A south- or west-facing location lets sunlight and wind assist the drying process. Rotate your supply by burning the oldest and driest logs first, helping to make each winter’s fuel use more predictable.

Planning scenarios: two real‑world examples

A modern, well-insulated family home

Consider a 100 m², three-bedroom new-build with strong insulation and a modern eco-design stove rated at around 7 kW. The household has gas central heating, but uses the stove on most evenings and weekends between November and March.

• Usage pattern: 4–5 evenings per week, plus weekend days in cold spells
• Estimated wood need: 3–5 m³ of dry hardwood per winter
• Potential savings: better loft insulation and improved draught sealing could move usage nearer 3 m³ than 5 m³

An older rural home with wood as main heat

Now consider a 150 m² stone property in a colder area, with partial insulation and a 10 kW wood burner as its main heating source, supported by electric radiators.

• Usage pattern: stove lit from morning to late evening, October to March
• Estimated wood need: 8–12 m³ of hardwood, depending on winter severity
• Levers to reduce: improved windows and internal wall lining could reduce annual wood use by several cubic metres

Key terms and risks worth knowing

Two terms appear frequently in discussions of firewood: “seasoned” and “green” wood. Seasoned wood refers to logs dried, normally outside under cover, for at least one to two years. Green wood has only recently been cut and still contains a high level of moisture.

Burning green wood wastes energy and increases the risk of chimney fires due to sticky creosote build-up.

Mixing species without understanding their burning properties can create further problems. Quick-burning softwoods can appear good value initially, but where a stove is relied upon as the main heat source, up to a third more volume may be needed than with dense hardwoods to deliver the same level of comfort.

Finally, consider pairing wood heating with other measures, such as programmable electric heaters in seldom-used rooms, heavy curtains over draughty windows and simple thermostatic controls. When less heat escapes elsewhere in the house, every cubic metre of carefully stored logs will go further towards a calm, worry-free winter.