I'm moving your question here, because it's kind of the general question thread lol and I'm not trying to help shithead make a better product. And TGI might actually chime in here if he feels so inclined
Not hard at all, Look at someone else, they made 300mg eq at like 300.3 it could be luck, but I think the guy is smart enough to do some basic math, you just have to keep all your numbers straight. There are calculators online that can even break everything down for you. For the basic home brewer you just need to know the volumetric density of the raw, solvents (ba/bb,etc) and the oil. It's important because the raw is measured by weight but everything else is by volume and you want weight of AAS per volume of carrier, or put another way that we know, mg/ml.
Take test cyp for example. If you wan't 250mg/ml and you want 10 vials(100ml), that means you need 25 grams of test. At a 2/18 ba/bb you already know 2% and 18% by volume is going to be those, so 2ml and 18ml, that leaves you 80ml in the brew. We know that test cyp displaces .909ml for every gram, this is where the converting of mg to ml is important. So at 100% purity we need 25g of test multiplied by .909 which is 22.72ml of space the 25 grams is going to take, if it were pure. That leaves us at 52.28ml of oil needed, 20ml of solvents, 42.72ml worth of raw and 52.28 of oil =100ml and a total of concentration of 250mg/ml
Now if that raw is 96% pure and assuming the other 4% of crap is the same volumetric density as the test, you're actually getting 240mg/ml so to compensate we need to divide 250(what we want) by 240(what we have) and that gives us 1.0416 so we need to overdose by 4.16%. Take the 25g at 96% times 1.0416 and we have 26.04g. We go back and start from scratch; 2ml BA, 18ml BB, call it 26 grams test cyp at .909 = 23.634ml. That totals 43.634 so far, so we need 56.336ml oil.
It may all seem trivial and sometimes it is, at a source level making 1L batches that's a difference of 10g of raw and about 10ml of oil but when you're paying $5 for tren or $15/g for primo that's 50-150 a brew. again, insignificant to most people, but that's quality, and that's what sets people apart.