Clarify the labels first
A value labelled THC and a total-THC result are not interchangeable without checking the report definition. Ask which compounds are measured, whether acidic and neutral forms are listed separately and which reporting basis applies. A percentage without this context is difficult to compare.
A calculation convention
NIST IR 8519 uses potential total THC = Δ9-THC + 0.877 × THCA. Use inputs with identical units and reporting basis. This calculation is not a Swiss legal classification or a prediction of an individual effect.
Use the result responsibly
The calculator below demonstrates arithmetic only. It supplies no missing test and accounts for neither measurement uncertainty nor sampling representativeness. If the report already includes a calculated total, do not add THCA again. Ask the laboratory and, where necessary, the relevant authority to clarify borderline or inconsistent results.
Worked calculation: potential total THC
Δ9-THC + 0.877 × THCA
Learning aid only: values must use the same units and reporting basis. Not a laboratory finding, threshold decision or statement of lawful marketability.
Editorial guidance, not individual legal advice, laboratory services or product release. No review by an external laboratory is claimed.
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