How Long Does a Bag of Logs Last?

When you grab a bag of logs from a supermarket, garden centre or DIY store, it’s a quick and convenient way to fuel your fire. But how long does a bag of logs last once you light up? The answer depends on several factors — including wood type, log size, how you burn them, and even your property’s insulation.

This guide explains exactly what you get in a small retail bag of logs, how long it typically lasts in both an open fire and a wood-burning stove, and how to make your bag last as long as possible.

What Do We Mean by “A Bag of Logs”?

In this article, we’re focusing on the smaller retail-sized bags commonly sold at supermarkets, forecourts and DIY stores — not the large dumpy or bulk bags you’d order from a firewood supplier.

These small bags are typically net or polythene sacks containing around 20 to 30 medium-sized logs (depending on log thickness and wood type). They’re designed for convenience rather than long-term heating value.

For the purposes of this article, we’ll assume an average of 25 logs per small bag, which allows for realistic, UK-based estimates of burn time.

Hardwood vs Softwood – The Key Difference

The type of wood makes a big difference to how long your bag of logs lasts:

• Hardwood logs (such as oak, ash or birch) are dense and burn longer and hotter, producing a steady heat ideal for extended use.
• Softwood logs (such as pine, spruce or fir) are less dense, ignite faster and burn more quickly, making them great for kindling or short, bright fires.

In simple terms:

Softwood = shorter, faster burn
Hardwood = longer, slower burn

If your small bag contains softwood, you’ll burn through it far more quickly than if it’s filled with kiln-dried hardwood.

How Long Does a Bag of Logs Last? (Open Fire vs Stove)

To estimate burn time, we’ve based calculations on kiln-dried logs with less than 20% moisture content, using a typical small bag containing 25 logs.

Here’s a comparison showing how long that bag of logs might last, depending on wood type, appliance and property insulation.

Estimated Burn Time for a Small Bag of Logs

Why the Differences?

• Appliance type – Open fires allow more air, so logs burn faster. Stoves restrict airflow, extending burn time.
• Wood species – Hardwood lasts longer due to higher density.
• Log size – Smaller logs catch quickly and burn out sooner.
• Property insulation – A well-insulated modern home retains heat, so you’ll need fewer logs per session.
• Burning habits – Loading multiple logs at once for a roaring fire uses more fuel than maintaining a slow, consistent burn.

Realistic Expectation

For most UK households:

• A bag of softwood logs might last one or two evenings of regular use.
• A bag of hardwood logs might stretch to three or four evenings in a stove if used carefully.

If you rely on your fire or stove as a primary heat source, you’ll find small retail bags uneconomical — they’re best suited to occasional or decorative fires.

How to Make a Bag of Logs Last Longer

To maximise your burn time:

• Use kiln-dried logs (moisture under 20%) for efficient, clean burning.
• Start with softwood for quick ignition, then add hardwood to maintain steady heat.
• Control the airflow on your stove once the fire is established.
• Avoid overloading the fire — one or two logs at a time is often enough.
• Store logs in a dry, ventilated space to prevent moisture reabsorption.
• Consider insulation improvements in older homes to make each log go further.

When a Small Bag Isn’t Enough…

If you find you’re constantly topping up from small retail bags, it’s often cheaper and more convenient to buy logs in bulk.

At FirewoodFund.co.uk, we supply kiln-dried hardwood logs in bulk bags and crates, available for nationwide delivery. Each order includes:

• Free delivery to most UK mainland addresses
• Tree-planting donation for every order
• Logs certified “Ready to Burn” (under 20% moisture)

You can even book your preferred delivery day, making it easy to plan ahead for winter.

Final Thoughts

So — how long does a bag of logs last?
For a typical small supermarket-style bag of kiln-dried logs, expect anywhere from 10 to 55 hours of total burn time, depending on whether it’s softwood or hardwood, your fire type, and your home’s insulation.

If you use your fire regularly, investing in a bulk bag of kiln-dried hardwood logs from FirewoodFund.co.uk will save you money, reduce refuelling frequency, and keep you warm for much longer.