Calculator
How strong is my infusion?
Enter what you actually have. You get a range, the assumptions behind it, and a link into the recipes that already rescale themselves to it.
Questions people ask
- Why is the answer a range instead of one number?
- Because nobody can tell you the THC in a tablespoon of butter without sending it to a lab. Three of the four numbers in the chain — decarb efficiency, transfer efficiency, and how much of the label you can trust — are estimates with real spread. A single figure would be a guess wearing a lab coat. Plan around the low end and treat the high end as the ceiling.
- My label says THCA. Is that the same as THC?
- No, and mixing them up is the most common mistake in edible math. Raw flower contains THCA, which is not psychoactive until heat converts it. That conversion sheds a carbon dioxide molecule, so 1 g of THCA becomes at most 0.877 g of THC. A label reading “Total THC” has already done that arithmetic for you; a label reading “THCA” has not. Pick the matching option and the calculator handles it.
- Does the type of oil matter?
- Less than people think. Saturated fats like butter, ghee and coconut oil hold cannabinoids slightly better than olive or grapeseed, but the difference is small next to your method. A sealed mason jar of olive oil beats an open pot of butter every time, because open pots run hotter at the surface than the cook believes and lose volatiles the whole way.
- How much flower should I use per cup of butter?
- There is no fixed answer, which is the point of the calculator — it depends entirely on your flower's potency and the dose you are aiming for. As a starting point, 7 g of 20% flower in one cup of butter lands somewhere around 40 to 60 mg of THC per tablespoon. Run your own numbers rather than copying a ratio off a blog that never saw your jar.
Next step: work out the dose per serving once you know how much of this infusion goes into a batch.
Every constant behind these numbers is written down, with its source, on the how this is calculated page. If you think one of them is wrong, say so — that page exists to be argued with.