NOTE!!! This online calculator is provided for informational purposes only. Remember that no one and nothing can say EXACTLY how long marijuana stays in YOUR body. It depends on many factors, such as age, weight, metabolism, amount and potency of marijuana, and the effect of THC detox products. This calculator is based on general information about the half-life of THC in the human body. This information isn't medical advice, so this website will not be held responsible if you are caught on a drug test.



Fifty nanograms of THC metabolites per milliliter defines a "presumptive positive" by NIDA (National Institute on Drug Abuse) certified labs. Your THC level must fall below 50 ng/mL marked with the RED line to pass a standard drug test.



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THC level, ng/mL