What is THC?

_Tetrahydrocannabinol (THC) is the main chemical psychoactive substance that gets medical marijuana users high. It is an extremely hydrophobic organic compound that is metabolized and broken down by the body into about 80 different metabolites. Because of the hydrophobic nature of these metabolites, polar molecules like water can't "stick" to and dissolve them. As a result, these metabolites associate themselves with other non-polar compounds, such as alkanes, oils, and body fat. Five of these metabolites are targeted by urine drug tests and can take a considerable amount of time for the body to pass them out of it's system.

_What does this calculator do?

_This calculator estimates (at several Confidence Intervals) how long THC metabolites remain in a user's body if a user were to cease using medical marijuana today. This is accomplished through the statistical analysis of urine drug screen results that have been submitted to us.

_What is a urine drug screen?

_A urine drug screen is a test that can detect the amounts of several substances in a urine sample. For the scope of this application, it is the most common and most accurate way to test for THC metabolites. 50 nanograms of THC metabolites per milliliter defines a "presumptive positive" by the National Institute on Drug Abuse (NIDA) certified labs.

_How does this calculator work?

_The calculation depends on several factors that were derived from the drug test results that people have submitted to us. Of these factors, three things are assumed:
  1. You consume medical marijuana primarily by smoking (not by ingesting/eating)
  2. You're drinking the recommended amount of water
  3. You are not using or plan to use any product that claims to detoxify your body*
*Although this version doesn't account for the use of detoxification and dilution, we do keep track of this and intend on using this information in future releases.

Other factors taken into account include the user's:
  • Age
  • Percent of body fat
  • Weight of body fat
  • Smoking frequency
  • Marijuana potency
  • Average smoking session length
  • Estimated metabolic speed
  • Weekly cardio activity level
  • Muscular composition level
  • Calorie burn rate

How do you expect to get drug test results from "legal" users?

Having a medical marijuana (MMJ) card does not protect a person from being drug tested and potentially fired by an employer. If you don't believe us, google and research the subject for yourself. Here's a good start. And here's a good example. This stands true for anyone, civilian, government, or military, that holds a MMJ Card. A doctor CAN NOT PRESCRIBE marijuana because it is a Hallucinogenic Substance defined in Section 1308.11 Schedule I which states:


"Substances in this schedule have a high potential for abuse and there is a lack of accepted safety for use of the drug or other substance under medical supervision. Furthermore, drugs listed in schedule I have no currently accepted medical use in treatment in the United States and, therefore, may not be prescribed, administered, or dispensed for medical use."


However, a doctor CAN RECOMMEND that a patient use marijuana for medical reasons and often times will produce the MMJ card for the patient if the state in which the doctor resides allows them to do so. But a prescription and a recommendation do not mean the same thing. A recommendation can't save someones job if they fail a urine drug screen.


To an employer, the fact that an employee fails a urine drug screen due to the presence of THC metabolites means that, according to federal laws, the employee performed an illegal act because marijuana CAN NOT BE PRESCRIBED. Results like these usually lead to disciplinary action taken against the employee in which the employee often loses their job.

So to answer the question, we only expect to get drug test results from medical marijuana users that have a MMJ Card. These people do get tested. In either case, it's your business if you are using marijuana with or without a MMJ card. If you get drug tested, it's also your business if you choose to submit your data to us. The data looks the same either way. Just remember that we're not encouraging the use of marijuana without a MMJ card.

_How long have you been collecting data?

Data collection from close friends and dozens of forums started around the development of our first application back in 2003, thcCalc. Data is now collected through our website's submission form and through our mobile application, THC Calc.


Below, you'll find a download link to thcCalc. This was written in Visual Basic 6.0 for a sophomore level college course. Feel free to download the .zip file and check it out. Just keep this in mind: the calculation that thcCalc provides is based on very little data. On top of that, it's full of errors. The only reason why we're listing it here is to express to you that a THC calculator is something that has been on our minds for a long time.

Download Link: thcCalc.zip

User Requirements:
-Read the paragraph above
-Don't be an idiot

System Requirements:
-Windows 2000
-Windows XP

-Doesn't work for high body fat percentages
-(Windows XP) The white text turns black, making it hard to read the instructions

-We don't know and don't care if this works for Windows Vista or Windows 7

_Is this THC calculator 100% accurate?

_There is a very fine line when it comes to a question like this. For the sake of our protection, then no, this THC calculator is not 100% accurate. The equation that is being used has a p-value less than 0.05. In statistical terms, this means that this equation produces results that are not statistically significant less that 5% of the time. In other words, more than 95% of the time, this equation is producing results that are statistically significant. From there, the results are broken down into several Confidence Intervals. But by using our application or website, you understand that we guarantee nothing are not responsible for any actions that you take based on the information that our calculation provides. Anything you do with information obtained from our application or website is done so on the behalf of your own, personal risk.