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So I got to thinking about chaos space marines and was wondering the percentage of cultists that made up one of their warbands. I remember reading that many warbands had suffered many casualties and resorted to taking in mobs of cultists to fill the void. I know not all of the chaos warbands are like this but for the ones that are just how much do you think normal people fill the gap in their group?

It's not so much "fill the gap" as "provide disposable cannon fodder". But I'd suggest most warbands have cultist troops available and in most cases they outnumber the astartes several times over if required

Bear in mind: In order to move from planet to planet, a chaos marine warband probably have a starship of their own. Even assuming it's something small, like an Iconoclast-class Destroyer (a generic 'small pirate raider' in the 41st Millenium), you're talking about a ship over a kilometre long with thousands of crew (according to the Rogue Trader RPG, something in the order of 16,500 is normal).

As a result, a Chaos Lord can easily afford to throw a few hundred cultists into any battle alongside his astartes. The only reason he wouldn't is because he choses not to.

The difference is probably noticable between Legion Traitors and more recent renegades - the Legions had big ships with big crews, and were used to operating with subordinate regiments of the Imperial Army. By comparison, 'modern' chapters fight more or less alone, and their ships are heavily automated and servitor-crewed to reduce the need for raw manpower, so they'd be less used to employing normal human troops and have less of a pool of slaves to draw upon.

Wait... you expect a chaos warband to have structure? As in one warband looking anything like another?

It's Chaos, man. CHAOS. As in no rules.

'We're all individuals! We're all different!'

'I'm not....'

My two teef.

@locarno24-Never really thought about it that way. It's kind of like how loyalist astartes have chapter serfs to do the mundane tasks and go into combat if need be.
@Warboss Gorhack- Well I mean there's bound to be some similarities amongst warbands lol. I thought that the black legion (I know it's many warbands) had a semi organized force, since Abbadon gets severely upset when people don't follow orders.

Probably not exactly what you're looking for, but given what your question is, I think you'd appreciate it nonetheless.
http://www.bolterandchainsword.com/topic/271640-misconceptions-about-csm/page-4#entry3316051

It varies wildly. Some CSM armies have cultists that literally follow them around, worshiping them. Others (God the Word Bearers are nasty) will actually torment imperial citizens until they're broken, and just turn the crazed, desperate people loose, murdering any that try to turn and run as an example. They don't bother bringing them with them. Others use them as serfs, and trust them to mundane tasks. And some just use them for target practice when they get bored, and keep them in bays of their ships just for giggles and playthings for the warp spawned. Some even run the chance of being recruited as actual CSMs if they prove themselves worthy. It varies EXTREMELY wildly from warband to legion to murderous pack.

Eh... if it's of any value, the Crimson Slaughter Codex Supplement had it that renegades such as imperial traitors, pirates and mercs, and EoT mortal refuges risk extreme peril in order to travel to the Crimson Slaughter's fleet in the EoT and join them. Once they got there these human got put into the lower decks of the Warband's many ships, where the Traitor Chapter's possessed and mutants dwell. If some of the mortals gets out of the lower decks they get to serve the Warbands as cultist auxiliaries.

Note that for the Crimson Slaughter's own marine recruitment, the traitor chapter as whole recruits, with the help of Fabius Bile, from the mortals who were young and untainted enough to be implanted, and from renegade CSMs.

Obviously other Warbands or Companies do things their way, and it might be drastically different from one warband to another in how they do with their mortal servants.