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It's kinda pointless because they're all warp creatures that are above and beyond normal greater daemons.
Still what do you think Angron who at bare minimum is 10 ft tall, and more than half that at the shoulder, would weigh?

This looks like something suitable for 40k background. Your wording also makes me suspect we have a really big Primarch fan here.

That said, I generally go with an average of 12' for Primarchs. Using a 6' strongman at, say, 110 kg as a comparison, the square-cube law gives us an average of 880 kg Primarchs. That said, their bodies are a marvel of genetic engineering and post-human science, and they may well be much lighter (or even heavier, with superdense muscles and bones).

How dense are they?

It might seem like like a really strange question to ask, and more 'physic humour' then a serious question when talking about fictional beings, it is actually something to keep in mind when it comes to that whole 'size changing' element you put forth. It is entirely possible that the mass of the object can remain stable while the size of it increases, leading to less density over all. For this reason we should focus only on their 'normal' sizes, and assume they do not make themselves 'super-dense' at these sizes... which is very likely, as it has a good deal number of advantages if their bodies can sustain it. We should also take note that you need to tell us what the local Gravity is like, as weight on the Moon is greatly reduced compared to weight on the Earth.

What I am trying to say is there is too many variable for us to even give you an educated guess, we will be throwing darts at a wall and assuming the answer 'sounds about right.' One thing that could be useful for your pondering is thus: The chart I looked at put the "ideal" weight of a 5 and a half foot tall body builder around 70 kg. This number does increase exponentially however, it is not a straight line but a curve, with a six foot tall Body Builder weighing close to 90 kg instead of closer to the 80 one would expect. This would mean you can not just double 70 to get a baseline for 11 feet, but it could still be useful for some rough numbers.

My guess puts them around 500 kg... minimum.

I consider the fact they are 'super human' to mean that they have a great deal more mass, with extra tight muscle fibres allowing for greater amount of muscle in the same amount of space. If the Primarch also have the same number of additional organs as Space Marines, these would also increase the mass of the subject and need to be factored in. Bone density would also have to be modified to simply be able to carry the additional muscle mass alone, so they would likely be denser then non-super human counterparts of the same size and thus have more mass as well. This could easily make them somewhere between two to five times heavier then a 'normal' human of the same height.

Honestly... wouldn't be surprised to learn I am under-estimating it with these guys.

 Ashiraya wrote:
This looks like something suitable for 40k background. Your wording also makes me suspect we have a really big Primarch fan here.

That said, I generally go with an average of 12' for Primarchs. Using a 6' strongman at, say, 110 kg as a comparison, the square-cube law gives us an average of 880 kg Primarchs. That said, their bodies are a marvel of genetic engineering and post-human science, and they may well be much lighter (or even heavier, with superdense muscles and bones).

It's pretty hard to spank primarchs further than what's explicitly shown.
Magnus completely stopped the flow of time across an entire planet, Vulkan took macrocannon fire, and survived without even needing his perpetual regen, Horus was afraid Angron would survive, and be pissed if they bombed Isstvan...etc.
I was thinking several metric tons.

The Primarchs were not 10 or 12 feet tall. Please, that's ridiculous.

You don't know what you're saying with that claim.

Given that marines are meant to be somewhere around 7'2" out of their armour IIRC, they'd be about 8' tall with armour. Given that the Primarchs are routinly stated as being significantly taller (and just larger all 'round) than a "normal" space marine, I'd hazard a guess that 10' tall would be reasonably close, with some of the large primarchs (eg Magnus) coming in somewhere around 12' once armour is taken into account.

Even at "only" 9-10 feet, they'd still be at least 300 kgs sans armour, assuming that they have anything like the enhanced bone structure and extra dohickies that their astartes children get, that number's probably closer to 4-500kg. One can only speculate wildly once armour and such is taken into account, and at that point, it's going to matter much more about which primarch we're talking about.

One would still imagine that speed focused Primarchs like Fulgrim, Sanguinius (especially Sanguinius, what with the whole flying schtick), Corax and the Khan would be notably lighter than bruisers like Mortarion, Vulkan, Peturabo and Horus. You'd expect most of the others to fall somewhere between the extremes with some oddities like Russ (since he was smaller IIRC) and Magnus (since he was a giant) being closer to the opposite ends despite their discipline focus.

7'2" is their height in armor

 DarknessEternal wrote:
The Primarchs were not 10 or 12 feet tall. Please, that's ridiculous.

You don't know what you're saying with that claim.

Ever seen Unremembered Empire's cover?
Jaghatai Khan is twice as tall as some tall mortal woman.
Russ is 1.5* as tall as an Astartes.
Angron ascending stairs slowly was going up them 3 at a time.

 Crevab wrote:
7'2" is their height in armor

Yeah, you're completely wrong.

Talking to the guy above me

 Crevab wrote:
7'2" is their height in armor

3 meters, according to the Night Lords books.

Let's agree on that no one will ever agree on Astartes height and go back to the subject of Primarchs, yes?

No because how can we guess the Primarchs height's when some folks refuse to believe a marine is anything less than twice the average human height

 Crevab wrote:
No because how can we guess the Primarchs height's when some folks refuse to believe a marine is anything less than twice the average human height

Funnily enough, that picture was amazingly quickly invalidated as GW (via BL) posted an image showing a Marine as 8'.

That said, I do not think I have ever seen someone say that a Marine is twice a human's height, so you'll have to show me where you saw that. I myself have never argued for more than 9'.

 Crevab wrote:
7'2" is their height in armor

Well we're talking bout prinarchs here.
But yeah still wrong. The general concensus is 7.5ft nude, and a bit under 8ft in armor.

Like you mentioned before, it varies wildly with BL. GW and the marines designer, Jes Goodwin" have been consistent.

Okay - Stand back everyone - I've got this.

Ahem

Heavier than a space marine.

*crowd goes wild

That's about as accurate as we can get without making things up I think. If I was guessing, I'll say 500 lbs, 2000 lbs armored up. (sorry about imperial, blame public school in the US)

 Crevab wrote:
Like you mentioned before, it varies wildly with BL. GW and the marines designer, Jes Goodwin" have been consistent.

Fortunately, GW's canon stance ensures that Goodwin's ideas are as easy to dismiss as C.S. Goto's.

Wow

 Ashiraya wrote:

 Crevab wrote:
Like you mentioned before, it varies wildly with BL. GW and the marines designer, Jes Goodwin" have been consistent.

Fortunately, GW's canon stance ensures that Goodwin's ideas are as easy to dismiss as C.S. Goto's.

There canon stance is that there is no canon.

So there's no point in even debating this.

About $25.00 per kilo.