How Many Cubic Metres of Firewood Do You Need for Winter?

Wood heating can create a cosy atmosphere, reduce reliance on fossil fuels and provide a welcome degree of self-sufficiency. However, getting your firewood order wrong could leave you cold in February or paying too much in October. Use this guide to calculate the cubic metres of firewood needed to heat your home through a full winter with a wood burner or insert.

What a “stère” means for your log store

In France, firewood is often measured in “stères”, a unit broadly referring to one cubic metre of logs stacked when they are one metre long. While this appears straightforward, the pile delivered to your drive may look rather different.

Most contemporary wood burners and inserts cannot accommodate one-metre logs. Merchants therefore commonly cut logs to 50 cm, 33 cm or 25 cm lengths. Shorter pieces fit together more closely when stacked, so their visible volume becomes smaller even though the quantity of timber remains unchanged.

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.

In the UK and the US, suppliers are more likely to describe their firewood as a “cubic metre bag”, “loose cubic metre” or “cord”. In North America, a cord traditionally measures 3.62 m³ of neatly stacked logs, at 4 ft high, 4 ft deep and 8 ft long. Always confirm whether the advertised quantity is stacked or loose-tipped, as well as the length of the logs supplied. These details can make a significant difference to how long an order lasts over winter.

The main factors affecting how much wood you burn

Wood consumption varies considerably between households. Five main factors determine whether five cubic metres will cover winter or whether you will get through twelve.

Home size and volume

Heating a compact 60 m² bungalow is very different from heating a 180 m² farmhouse with tall ceilings. Floor area is not the only consideration: high ceilings and open-plan spaces also increase the volume of air requiring heat.

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 high rooms and draughty windows, that requirement can readily double.

How effectively your home retains heat

Insulation usually influences firewood use more than any other single factor. A well-insulated home holds on to heat from the stove for longer, reducing the number of logs you need to burn.

• Properties with effective loft insulation, cavity-wall or solid-wall insulation, and double glazing can consume 30–50% less wood than comparable poorly insulated homes.
• Straightforward improvements, such as sealing draughts around doors, chimneys and floorboards, can noticeably reduce log use.

Appliance type and efficiency

An open fire may look appealing, but much of its warmth escapes through the chimney. A modern wood burner or closed insert works in a markedly different way.

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

The wood you choose to burn

Logs do not all provide the same performance. Dense hardwood contains more energy per cubic metre and generally burns for longer.

• Hardwoods including oak, beech, ash and hornbeam are well suited to continuous heating. They burn slowly, produce reliable embers and deliver strong heat.
• Softwoods such as pine and spruce ignite easily and burn hot, but are used up quickly, leading to more frequent 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 your actual stove use

Homes in milder coastal locations may use the stove for only three or four months. In colder northern or inland areas, the heating period may last six or seven months. Your routine also has an effect: working from home, heating spaces throughout the day or keeping the stove going until late at night will all increase wood consumption.

How many cubic metres suit your pattern of use?

After considering your property and day-to-day habits, you can identify a realistic consumption range.

Occasional use for cosy evenings

If you mostly light the stove at weekends and on a handful of weekday evenings, while another system provides your primary heating, you will fall into the lower range.

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 lit several times a week.

Regular supplementary heating

Many households use a wood burner as meaningful back-up heating, reducing demand on gas, oil or electric systems, particularly during the coldest periods.

For this type of use, a broad estimate is:

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

Main or near-main heating source

If a wood burner or insert supplies the principal heating, maintaining an adequate log pile is essential. A shortage can mean an uncomfortable home or 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 exceptionally well-insulated semi-detached home may need around 5 m³. By contrast, a large, older rural property with high ceilings and an average stove could require 10–12 m³, particularly during severe winters.

Practical ways to reduce wood use without getting cold

Cutting log consumption does not have to mean turning down the thermostat and being uncomfortable. A number of practical measures can make a substantial difference.

• Burn dry wood only: Target moisture content below 20%. Damp logs use their energy producing steam rather than heat, while creating additional soot and creosote in the flue.
• Monitor the burn: Rapidly blackened stove glass and heavy chimney smoke can indicate damp wood or inefficient combustion.
• Maintain and sweep regularly: A clean stove and flue support better draw and combustion. In many countries, an annual chimney sweep is a legal safety obligation.
• Match log size to the appliance: Consistently sized, shorter logs fit more effectively in the firebox and burn more efficiently.
• Operate the controls correctly: Restricting the air supply heavily all evening encourages tar deposits and reduces heat output. It is better to maintain proper flames before allowing the embers to provide heat.

Storing winter firewood: where real savings begin

The way you store logs often determines whether you benefit from all the energy within them. Even properly cut hardwood can become as wet as a 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 above ground level using pallets or rails. Cover its top with a sturdy roof, sheet or tarpaulin, while keeping the sides open to allow free airflow. A south- or west-facing position lets sunshine and wind assist the drying process. Rotate supplies by burning the oldest and driest logs first, making each winter’s consumption easier to predict.

Planning scenarios: two everyday 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 roughly 7 kW. The household has gas central heating, but uses the stove on most evenings and at weekends between November and March.

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

An older rural home heated mainly by wood

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

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

Key terms and risks to understand

Two terms appear frequently in discussions of firewood: “seasoned” and “green” wood. Seasoned wood has dried, normally outdoors under cover, for at least one to two years. Green wood has been freshly felled and still contains substantial moisture.

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

Burning mixed species without knowing how they perform can also prove troublesome. Fast-burning softwoods may appear good value initially, but when a stove is your main heating source, you may need up to a third more volume than dense hardwoods to achieve comparable comfort.

Finally, consider pairing wood heating with other measures, including programmable electric heaters in infrequently used rooms, thick curtains at draughty windows and straightforward thermostatic controls. When less heat escapes elsewhere in the home, every cubic metre of carefully stored logs will go further towards a calm, worry-free winter.