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

Wood heating creates a cosy atmosphere, can reduce reliance on fossil fuels and gives you a 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 how many cubic metres of firewood you need to run a wood burner or insert throughout a full winter.

What a “stère” means for your firewood stack

In France, firewood is often measured in “stères”, which broadly refers to one cubic metre of logs stacked in one-metre lengths. Although that appears straightforward, the amount delivered to your drive can be more complicated.

Most current wood burners and inserts cannot accommodate one-metre logs. Merchants usually cut logs to 50 cm, 33 cm or even 25 cm. Shorter pieces fit together more closely when stacked, so while the quantity of timber 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.

In the UK and the US, suppliers more commonly use descriptions such as “cubic metre bag”, “loose cubic metre” and “cord”. In North America, a cord traditionally measures 3.62 m³ of tightly stacked logs (4 ft high, 4 ft deep, 8 ft long). Always check whether a stated quantity refers to stacked wood or loose-tipped logs, as well as the log length. That seemingly minor distinction can substantially affect how long your supply lasts over winter.

The main factors that determine firewood consumption

Every household burns wood differently. Five main factors will determine whether five cubic metres see you through winter or whether you get through twelve.

House size and internal volume

Heating a compact 60 m² bungalow is very different from heating a 180 m² farmhouse with tall ceilings. Floor space is not the only consideration: high ceilings and open-plan rooms increase the total volume that needs warming.

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 effectively your home retains heat

Insulation usually makes more difference than any other variable. A properly insulated property holds onto heat from the stove for longer, reducing the number of logs required.

• Homes with effective loft insulation, cavity or solid-wall insulation and double glazing can consume 30–50% less wood than comparable poorly insulated properties.
• Straightforward improvements, such as sealing gaps around doors, chimneys and floorboards, can significantly reduce the amount of firewood you use.

Appliance type and efficiency

An open fire may look impressive, but much of its heat escapes through the chimney. A modern wood burner or enclosed insert performs in a markedly different way.

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

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 species you burn

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

• Hardwoods including oak, beech, ash and hornbeam are well suited to sustained heating. They burn slowly, produce consistent embers and deliver high heat.
• Softwoods such as pine and spruce ignite easily and burn hot, but are used up quickly, requiring 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 everyday stove use

Homes in milder coastal areas may only need the stove for three or four months. In colder inland or northern locations, the heating season may last six or seven months. Your routine is equally important: working from home, warming rooms throughout the day or running the stove until late at night will all increase wood consumption.

How many cubic metres suit your pattern of use?

Once you have assessed your property and habits, you can identify a realistic consumption range.

Occasional “cosy evening” use

If you mostly light the stove at weekends and on a few weekday evenings, while another system provides your main heating, you will sit at the lower end of the scale.

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 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 weather.

For this level of use, a broad estimate is:

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

Wood burner or insert as the main heat source

When a wood burner or insert provides the primary heating, maintaining an adequate log store is essential. Running short can result in discomfort or costly reliance on 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 may easily require 10–12 m³, particularly in more severe winters.

Practical ways to use less firewood without getting cold

Cutting log use does not mean turning down the heating and putting up with discomfort. A few practical measures can make a considerable difference.

• Burn dry wood only: Target a moisture level below 20%. Damp logs use energy to produce steam rather than heat, while creating extra soot and creosote in the flue.
• Monitor the burn: Stove glass that blackens quickly and dense chimney smoke can indicate poor combustion or wet logs.
• Have the stove serviced and chimney swept regularly: A clean appliance and flue support better draw and combustion. Annual sweeping is a legal safety obligation in many countries.
• Match log size to the appliance: Consistently sized, shorter logs fit more effectively in the firebox and burn more efficiently.
• Operate the air controls correctly: Restricting the air supply too far for an entire evening produces tar deposits and less heat. It is better to maintain strong flames before allowing the embers to provide heat.

Storing winter firewood: where savings really begin

Your storage method often determines whether you benefit from all the energy in your logs. Even properly cut hardwood can act like a wet sponge if it is placed directly onto damp ground and sealed tightly in plastic.

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

Raise the stack from the ground using pallets or rails. Cover the top with a solid roof, sheet or tarpaulin, while leaving the sides open to allow air to circulate. A south- or west-facing position lets sunlight and wind assist the drying process. Rotate your logs by burning the oldest and driest stock first, making winter consumption more reliable.

Planning examples for wood burner firewood supplies

A modern, well-insulated family house

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 runs 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 draught sealing could move their requirement nearer 3 m³ than 5 m³

An older rural property heated mainly with wood

Now consider a 150 m² stone house in a colder area, with partial insulation and a 10 kW wood burner as its main heat 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 wood use by several cubic metres annually

Essential firewood terms and risks

Two terms appear regularly in discussions about firewood: “seasoned” and “green” wood. Seasoned wood has been dried, generally outside under cover, for at least one to two years. Green wood has only recently been cut and retains a high level of moisture.

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

Mixing timber species without knowing how they burn can create problems as well. Fast-burning softwoods may appear good value initially, but households using a stove as their main heating source may need up to a third more volume than with dense hardwoods to achieve equal comfort.

Finally, consider pairing wood heating with other measures, including programmable electric heaters in infrequently used rooms, heavy curtains over draughty windows and simple thermostatic controls. The less heat your home loses elsewhere, the further every cubic metre of carefully stored logs will go towards a peaceful, worry-free winter.