Ok so a break down, 10 holes, 2'x2'x2' (50 litres), the soil is 90% clay with some really bad top soil a few layers on top of it, so basically it's all going to be removed and replaced as soon as it gets a little warmer out with: 1 cup blood meal 1.5 cups bone meal 1/2 shovel manure 48.816% organic potting soil 29.290% coco coir 19.526% earthworm castings Ok so the mix looks good, now the problem is, different items come in different packaging, some some will be listed by cu ft, some by pounds, some by litres, some by quarts, etc. So basically what I did was try to find out how much I would need for each of So for 10 holes these are the numbers I came up with, basically a litre = 4.22675284 these and converting it all into cups. cups, so take 4.22675284 cups * 50 (number of litres per hole) * 10 (number of holes) = 2113 cups. : 10 cups blood meal 15 cups bone meal 5 shovels manure (around 25 cups) 1031.5 cups organic potting soil 618.9 cups coco coir 412.6 cups earthworm castings So basically from researching all over the place, it really isn't that easy to convert a pound into a cup... I believe it was Fox Farm's web site that said there is 2.77 cups per pound in soil, but almost everywhere else the logic breaks down that there is 16 ounces in a pound and 1 cup in every 8 ounces, so 1 lb would equal 2 cups. My dilemma is that if this is true for 10 holes that 2 cups equals a pound, I'll need around 582lbs of potting soil alone. Since I'm going organic I'm wondering if anyone knows what is more accurate the 2.77 cups/lb or the 2 cups/lb. I'm about to go buy some soil and just scoop it out cup by cup to find out what the number is if nobody can give me a solid answer on this, I just don't want to buy too much when I don't need it. For things like earthworm castings it's different since buying too much of it isn't a bad thing since I'll be using it in teas etc. Any help, appreciated..