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Online THC Calculator

NOTE!!! This calculator is made for informational purposes only. Remember, that nobody and nothing can say how long EXACTLY does THC (cannabis) stay in YOUR body (blood, urine). It depends on a lot of factors, such as human age, weight, metabolism, amount and potency of marijuana, effect of thc detox products etc. This calculator was based on the averaged information about half life of THC in human body. This isn't medical advice, so this website will not be held responsible if you are caught on a drug test.

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

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See also How To Pass A Urine Drug Test and How Long Does Marijuana Stay In Your System


THC level, ng/ml
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If you need to quickly reduce THC level in your system, use Fast THC Marijuana Detox Kit. This detox kit is for people OVER 200 LBS. Must be taken 2 hours before you want to be clean.
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