SweetSue's Cannabis Oil Study Hall - Kingston's Potency of Herb Calculations

KingstonRabbi;3420850 said:

Chew;3420779 said:

That was pretty gentle Sue, thank you, however, I still cannot get this straight in my head...

Ok, forget infused oil and CCO. We are extracting the resin glands from the plant, right? 20% is 20% no matter if it's 1 gram or 20 grams, but how can you arrive at mg per dose when we don't know how much resin was produced by the plant?

Surly, if strain A gives more resin than strain B, then the cannabinoid load in that 300ml of carrier has to be different ? Which surly means a size 00 cap from strain A would have a larger dose that strain B???

Lol! Make me understand!!

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The short answer is we guess a lot. Based on prior experience, but still a bunch of guesses tied together. And don't call me Surly.

Slightly longer answer is I have some idea of how much THC is in the plant material, either because I vaped it or it's a clone I've grown before. No math so far, just an educated guess.

The only reason I mentioned CCO was to estimate the efficiency of extraction. Sue knows it's about 85% from others who have actually done tests. Resin doesn't always equate with THC content of herb. Sometimes but not consistently, so I'm sorry for thinking out loud in my post above.

So with an educated guess on potency of herb and a tested efficiency of extraction the math is relatively simply, but just to be safe
WARNING! MATH AHEAD! Skip to bottom for easy conversions.

If I put 100 grams of dry herb (or wet equivalent) that I guess is 10% THC:
100 g x 10% =10 grams THC total.

At 85% extraction:
10 g x 85% = 8.5 grams infused in the oil.

Converted to mg:
8.5 x 1000 = 8500 mg

Last step, I used 400 ml of olive oil (or rather I will in 2 weeks):
8500 mg / 400 ml = 21.25 mg/ml.
Because I started with a guess I'll round that off to 20 mg/ml.

Now it gets really simple, because if you keep the proportions of herb to oil the same you can go straight from potency of herb to potency of oil as follows:
5% => 10 mg/ml
10% => 20 mg/ml
15% => 30 mg/ml
20% => 40 mg/ml

I hope that was mostly painless. I know I had fun.

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