RSO Potency and Serving Estimates: What the Numbers Really Mean
Last Updated:October, 2026 • Josh
Mercy Leaf RSO has been tested at 75% THC by weight. That means a gram contains about 750 mg THC before it goes into a recipe. Let’s walk through the math together and explain why that still doesn’t tell us exactly what’s in each finished piece.
- A gram of RSO isn’t a gram of THC
- At 75%, a gram of Mercy Leaf RSO contains about 750 mg THC
- Batch math gives an estimate, not a tested dose per piece
- Keep track of your source batch and quantities
Mercy Leaf’s tested RSO example: Using 75% THC by weight, 1 g × 1,000 mg/g × 0.75 = 750 mg THC in the starting RSO. A 0.5 g amount corresponds to 375 mg THC and 0.1 g corresponds to 75 mg THC. If 0.2 g RSO (150 mg THC before losses) were used in 30 portions, the mathematical average would be 5 mg per portion. This is not a verified potency for any finished portion: transfer losses, cannabinoid degradation, incomplete mixing and unequal portions may change the result.
Let's make sense of the numbers
The first confusing detail is that a gram of RSO is not a gram of THC. A gram measures the mass of the entire extract. The percentage tells you how much of that mass was measured as THC in the test result. Mercy Leaf uses a tested reference of 75% THC by weight, so a one-gram sample corresponds to about 750 milligrams of THC in the starting material.
Work through one example slowly
Start with the tested percentage. Multiply the RSO mass in grams by 1,000 to convert it to milligrams of extract, then multiply by 0.75. For example, 0.2 gram × 1,000 × 0.75 gives 150 milligrams THC in the source extract. That's the amount before mixing, transfer or cooking, not a measurement of an edible.
Why dividing by servings isn't the whole story
If a recipe makes 30 pieces, dividing 150 by 30 gives a mathematical average of 5 milligrams per piece. But the calculation quietly assumes that every bit of the extract entered the batch and that it dispersed perfectly. In a home kitchen, some extract may remain on utensils or be unevenly distributed. Label that result as a theoretical average, not a verified strength.
Read the test result, not just a percentage someone remembers
Check which batch was tested, whether the result describes THC or total potential THC and which units the laboratory used. A result for one batch should not be assigned to a different batch without evidence. If you're unsure about the label, read our RSO syringe guide before doing kitchen arithmetic.
Keep the notes simple
A useful batch record has the source batch, date, tested concentration, amount of RSO, other ingredients, finished quantity and any changes you made. That's enough to understand what you attempted and why a later batch might behave differently.
One last practical distinction
THC amounts describe chemical content, not how a person will feel. Edibles can take a while to be noticeable and may last longer than expected. Avoid treating homemade portions of uncertain strength as precisely dosed products, and keep them clearly labeled and securely stored.
Further reading and sources
For more on edible safety, see the CDC guidance on cannabis poisoning. The FDA overview of cannabinoid safety addresses side effects and interactions. These links provide background information, not validation of a homemade recipe.
Frequently Asked Questions
No. A gram is the weight of the whole extract. At Mercy Leaf’s tested 75% THC, one gram of RSO contains about 750 mg THC.
You can, but that gives a mathematical average, not a measurement of each piece.
No. The syringe tells you about the starting RSO. What ends up in the finished food can vary.
Testing representative finished pieces is how you find out whether the batch is consistent.
Not a good idea. Edibles may take a while to kick in, and taking more too soon can be unpleasant.
Mercy Leaf RSO is tested at 75% THC by weight. That works out to about 750 mg THC in one gram of source RSO. It’s a useful starting number, but finished gummies, brownies, oils and balms may not have evenly distributed THC.
A little math goes a long way. Start with the tested result, keep simple records and don’t confuse a theoretical average with a measured serving.
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Mercy Leaf Educational Disclaimer
Mercy Leaf provides educational information about cannabis and related topics for informational purposes only. This content is not intended to diagnose, treat, cure, or prevent any disease, and should not be considered medical or legal advice. Cannabis laws vary by jurisdiction, and individual responses to cannabis products may differ. Always consult a qualified professional before making health-related decisions.