How much in kg is cubic 1m of kiln dried logs?

It would depend on the density of the wood.
That link says your 25kg bags are the equivalent of 0.1 cubic metres so that would make a cubic metre of that particular product 250kg.

It would depend on the density of the wood.

and the way it's stacked and the water content!

I know nothing about logs.

Converting from size to weight (mass) for loose items is always going to be a range. Look at US cooking recipes. A cup of flour and a cup of sifted flour are different measurements.

There's going to be a difference in lost space between items depending on size, all other things being equal a cubic metre of kindling will weigh differently than 1m^3 of otherwise identical big logs. Different types of wood will have different densities. Varying degrees of drying out will affect it also.

It would depend on the density of the wood.

and the way it’s stacked and the water content!

Exactly.

Softwood yes about 200kg sounds right to me, up to about 350kg for a super sense hard wood.
For example, I fill the blue IKEA tote bags, the 71 litre bags, at my stack a and carry the logs inside. I know that about 12-14 bags is a cube (obviously they bulge and I'm brimming them if it's 12!) I also know from weighing lots so that I don't over load my trailer when I transport some wood to mum, a bag full is 19- 25kg. Oak would be top end of that. So I'd work on 300kg give or take, for hardwood.

all things considered, I'd guess at somewhere between 200 and 350kg

Kiln dried so assume moisture content of
10 - 15%.
1M3 of oak, densely packed, <15% will be c700kg.

I see a transit pick up with six bulk bags on the back delivering logs, it doesn't look like it's weighed down so probably 200kg if your lucky, is hardwood better to buy or softwood ?

Another way to work it out is, a tightly stacked pile is around 40% air gaps, and Google will help you find tables with dried wood densities. https://www.engineeringtoolbox.com/wood-density-d_40.html
This method tends to a heavier number than my own experience....so either I don't stack very tightly or I over estimate the size of my log pile a little.... Or my 2 year seasoned oak is very very dry.

So I’d work on 300kg give or take, for hardwood.

Balsa is a hardwood.

Kiln dried so assume moisture content of
10 – 15%

Kiln dried simply means it's been dried in an oven, [despite how it sounds] it doesn't necessarily mean it's drier than logs dried naturally.
It also depends on when they came out of the drier as they then start to absorb moisture again.
The ad says < 20% moisture so I'd work on 18%*

* No business is going to spend more money drying logs more than they need to!

is hardwood better to buy or softwood ?

Personally I think a mix is better. Softwood for getting it going/higher heat and hardwood for longivity.

Thanks all - even if it's 350kg it works out at the same sort of price/kg that I'm paying now.

So I'll stick with the 25kg bags for now.

Ta!

I've had my trailer weighed with 2 cubic on it, several times. Lightest i've had is about 275 kg/cubic, heaviest about 330. That's all sorts of combinations of hard and soft, but all well stacked and packed and dried for ¨18 months before i pick it up.
Though i pay about 60-70 quid/cubic, so definitely worth it!

Balsa is a hardwood.

It is indeed, but did you know that the majority of the balsa you see for sale in craft and model shops is actually the sapwood not the heartwood which is a bit denser and stronger.

I'm glad another real world experience agrees with my findings. Which means when a tightly stacked stack is half air.

A cube of oak elm or beech will be much heavier than a cube birch which is heavier than a cube of willow or poplar.

It'll also burn hotter and for longer as it's more calorific.

Neilnevill

When I processed firewood, the gaffer and I did the volume calcs. On average we were finding bulk loads in bags crates etc were 60% air. These measurements were taken about 13 years ago.

I would have guessed 250kg. Depends on soft or hard wood and shape/size of logs.

Agree that mixed is best for combination of quick to heat up, max heat and longevity.

Also if you stack the wood (add paper, cardboard and hot max) in a lattice type pattern and fill up to the top of the stove then you really don't need to add any wood all night. Just control the air flow.

stack the wood (add paper, cardboard and hot max) in a lattice type pattern and fill up to the top of the stove then you really don’t need to add any wood all night. Just control the air flow.

Doesn't that produce shit loads of pollution that way?

The link in the op I must be blind but I couldn't see a weight on them?

When I processed firewood, the gaffer and I did the volume calcs. On average we were finding bulk loads in bags crates etc were 60% air. These measurements were taken about 13 years ago.

I've seen various places
quoting 40, 50 and 60% air in "well stacked" wood. The definition of "well stacked" obviously varies hugely!

The link in the op I must be blind but I couldn’t see a weight on them?

Because firewood can’t be sold by weight.

Off the point but it seems somewhat counter productive to kiln dry firewood doesnt it.

The link in the op I must be blind but I couldn’t see a weight on them?

They don’t sell by weight but the bags are approx. 25kg.

Off the point but it seems somewhat counter productive to kiln dry firewood doesnt it.

It's ****ing insane

I’ll have my own supply for next winter - got an ash, maple and cedar being dropped after Christmas. Better upgrade my axe! 🤣🪓