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THC degradation calculator

When consuming cannabis, many people ask themselves: "How long does THC stay in my body?" This question becomes especially important when a drug test is imminent or you want to know how your body reacts to cannabis. The THC Degradation Calculator offers a simple and practical way to get an estimate of how long THC and its metabolites will be detectable in the body.

What is THC?

Tetrahydrocannabinol (THC) is the psychoactive ingredient in cannabis that causes the familiar "high" feeling. After consumption - whether by smoking, vaping or edibles - THC is absorbed and processed by the body. The breakdown products of THC often remain detectable in the body longer than the THC itself.


How does the THC breakdown calculator work?

The THC degradation calculator uses various information to estimate how long THC will stay in your body. Here's how the process works:

  • Personal data: You enter information such as weight, height and age. This helps to evaluate your metabolism.
  • Consumption habits: You explain how often and how much cannabis you consume, as well as the form of consumption (smoking, vaping, edibles).
  • Time of last use: The time of your last cannabis use is crucial in determining how much THC might still be in your system.
  • Calculation: The calculator uses all this information to estimate how long THC and its breakdown products are detectable.
  • Result: You will receive an assessment that shows you how long THC may remain detectable in your body.

Simplified Mathematical Basis of the THC Degradation Calculator

A simplified method that provides a good approximation without being too complex is based on the assumption that the body breaks down THC approximately linearly rather than exponentially. This makes the calculation much easier and is sufficiently accurate for most everyday applications.



  • C(t): Concentration of THC in the body after time tt in days.
  • C_0: Original concentration of THC in the body immediately after consumption.
  • r: Degradation rate of THC in the body (ng/ml per day).
  • t: Time in days since last consumption.

The degradation rate rr can be assumed as an average value that depends on factors such as metabolism and consumption behavior. For occasional users, a value of about 15 ng/ml per day could be realistic, while for regular users, values ​​of about 5 ng/ml per day could be assumed.


Suppose someone has 50 ng/mL of THC in their body immediately after consumption and is an occasional user with a clearance rate of 15 ng/mL per day. How much THC is left in their body after 10 days?

C(10)=50−(15×10)=50−150=−100 ng/mLLC(10)=50−(15×10)=50−150=−100 ng/mL

The result shows that theoretically the THC should no longer be detectable in the body after about 3 days (5015≈3.331550​≈3.33 days).

This simplified model gives you a quick and easy way to estimate THC degradation, although it does not accurately reflect reality.


Why is the THC breakdown calculator useful?

Medical cannabis patients
With the THC degradation calculator you can better understand how long the active substances remain in the body.

Occasional and regular consumers
The calculator helps you to better understand your own body and to know how long THC can be detected, which can be helpful for upcoming drug tests or for conscious consumption behavior.

Employees and athletes
In many professions and in sports, cannabis use can have serious consequences. The calculator helps to plan and ensure compliance with guidelines and regulations.


The THC Degradation Calculator is a useful tool for anyone who wants to better understand their cannabis consumption and its effects on the body. Using a simplified formula, you can quickly estimate how long THC will remain detectable in your system. Test the calculator and use these insights to make your cannabis consumption safer and more conscious. Try it out and discover how it can help you better understand and control your experience with cannabis!