Convert common cannabinoid laboratory units only when the needed measurements are available. This calculator handles mg/g, mg/mL, percent by mass, per-serving totals, per-unit totals, and package totals. It will not silently invent density, unit weight, or serving size.
Convert a COA Measurement
Use this only when the COA percentage is expressed on a mass basis. 1% by mass equals 10 mg/g.
What This Converter Can and Cannot Do
| Starting information | Can calculate | What must also be known |
|---|---|---|
| Percent by mass | mg/g | The report must actually use a mass-based percentage |
| mg/g | Percent by mass | No extra value for a mass-based result |
| mg/g | Total mg in a gummy, topical, package, or sample | Mass in grams for that exact unit or package |
| mg/mL | Total mg in a serving or bottle | Volume in milliliters |
| mg/g | mg/mL | Density in g/mL |
| mg/mL | mg/g | Density in g/mL |
Why mg/g and mg/mL Are Not Interchangeable
mg/g is a mass concentration: milligrams of the measured cannabinoid per gram of sample. mg/mL is a volume concentration: milligrams per milliliter of sample. Moving between those units requires the sample’s density in grams per milliliter.
mg/mL = mg/g × density (g/mL)
mg/g = mg/mL ÷ density (g/mL)
That missing density is why some CBD Product Passports intentionally leave package-level potency comparisons as Unknown even when the laboratory concentration itself is readable.
Examples
Example 1: Convert 2.5% to mg/g
For a mass-based percentage, multiply by 10. A 2.5% result equals 25 mg/g.
Example 2: Convert 50 mg/g to a 4g gummy
Multiply 50 mg/g by 4g. The calculated amount is 200mg in that 4g unit.
Example 3: Convert 40 mg/mL to a 0.5mL serving
Multiply 40 mg/mL by 0.5mL. The calculated amount is 20mg in that serving.
Example 4: Convert 100 mg/g to mg/mL
You need density. If the tested oil has a documented density of 0.95g/mL, the calculation is 100 × 0.95 = 95 mg/mL. Without that density, the conversion stays unknown.
How to Verify the Math Against a COA
- Confirm the product and batch or lot match the item you are checking.
- Copy the cannabinoid result exactly, including its unit.
- Identify whether the report is using mass, volume, a whole unit, or a package total.
- Use only a mass, volume, serving size, unit weight, or density that is documented for the same product or tested sample.
- Keep the original laboratory result beside the converted value so the calculation can be reproduced.
- If a required measurement is missing, record the comparison as Unknown instead of filling the gap with an assumption.
For the full evidence workflow, use How to Read a CBD COA and the CBD COA Batch-Match Checklist.
Reporting Context
Laboratory reporting conventions depend on the testing program and product. As one current regulatory example, California’s Department of Cannabis Control requires cannabinoid results to be reported as a percentage and in mg/g when measured by weight or mg/mL when measured by volume, with package and serving amounts reported where applicable. That California rule is an example of how units are distinguished, not a nationwide CBD labeling rule.
Official references: California Department of Cannabis Control regulations · California DCC testing laboratories