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well, per company we have 100 line, 2 command (captain and Chaplain) and a command squad for the 2 of them (going based off of double demi-company), so companies 1-9 are sitting on 112
Total: 1008

Then we have scouts, and again, assuming 100 scouts (could easily be more for 90% of chapters), 2 command, and a command squad for each
Total: 1120

Now we have high command: A chapter master, Head Librarian, Head chaplain, Head apothecary, and 10-30(going to go with 30) honor guard,
Total: 1154

Now we have the rest of the librarius, counting both combat and non-combat psykers, it's probably around 15-20 men
Total: 1174

Tech marines are an odd one, I'm going to assume around 50, because both command elements, elements piloting ships, thunderfire cannons, etc.
Total: 1224

Dreadnoughts! their marines, going based on the 6th edition book (memory is rough, correct me if i'm wrong) roughly 20 dreadnoughts per chapter, probably more for most

Total: 1244

SERFS! not really space marines, but who cares, probably around 2-3 per marine, so another ~3000 dudes, comin' up!
PILOTS! someone drives the ships, and who knows how many dudes there are per, so were not gonna count them!

Final Totals: Marines: 1244, serfs included: 4976

This is for fairly codex compliant chapters, and most of the 1000 chapters probably have more.

Total marines in the Imperium: ~1,300,000, serfs included: ~5,200,000
There is an extra 56,000 marines in there from black templars, space wolves, and other chapters that said: screw the codex!

The Imperium would be better of if they didn't limit to 1000 chapters, but again, in the fluff, 100 tabletop marines = 1 fluff marine

 jonolikespie wrote:
Space marines are not, at least not since the Heresy, an invasion and occupation force. They are a force multiplier. They fight by launching a lighting raid of only fifty marines, kill the orc warboss, take out the key necron monolith, form the armoured spear tip rolling through a tau barricade. All of this they do with the assumption there are 10 imperial guard regiments following them to mop up the mess they leave.

Theoretically the breakdown of chapters and companies works, but the limit of a thousand chapters is still dodgy. A few thousand chapters would be good, but the way they are supposed to fight means they shouldn't need to be moving around together above company strength.

By way of example, in the old fluff, a squad of Deathwing terminators wiped out a Genestealer infestation of a planet.

 Co'tor Shas wrote:

 Psienesis wrote:
There's not enough stars in the galaxy to have that many worlds, even if every star in the Milky Way had habitable planets circling them that were all human-owned (which they most certainly are not).

Yeah, their are aroudn 100 billion stars int he milk way. And there are supposed to be around a 'mere' 40 billion habitable worlds. Now, the imperium, if it's as mighty as some would have us believe, defiantly have more than 1M worlds, but nowhere close to the trillions.

That 40 billion number is just the number of planets which would be in the habitable zone of their star. It does not mean the planet is fit for humans to colonize. A huge huge chunk of these worlds will be inaccessible by warp travel, too toxic, subject to other environmental factors which make it uninhabitable, not have any resources to make the world viable to settle, be controlled by alien species, be as yet undiscovered, be controlled by humans who have still not been reunited with humanity since the Dark Age of Technology, etc...

The Imperium is the largest united faction in the galaxy. But they are far from controlling a majority of the total worlds available. If you control 5% of something, and nobody else owns more than 0.000001%, you are the big fish in the pond.