THC Breakdown Calculator

November 3, 2025 Der Knospenzwirbler
Weed Wissen

Wie lange bleibt THC nachweisbar? Mit unserem THC-Abbau-Rechner bekommst du eine grobe Einschätzung – inklusive typischer Nachweiszeiten für Urin, Blut, Speichel und Haar.

Whether it is a one-time use or daily habit, the breakdown of THC is complex and depends on many factors: metabolism, body weight, frequency of use and dose. With our interactive THC breakdown calculator you can now get a rough estimate of how long it takes until no more THC traces are detectable.

Frequency of use Amount used Metabolism Body weight (in kg) Days since last use

How the calculation works

This calculator is based on simplified assumptions about how THC breaks down in the human body. THC and its metabolites are stored in fatty tissue and excreted over a longer period. That means: the higher the body fat percentage, the slower the breakdown.

💡 If you really want to know whether you still have THC in your body, reach for a THC / cannabis rapid test

The role of body weight

Body weight indirectly influences how fast THC breaks down. With a higher weight (more storage tissue), THC can linger longer in the body, while leaner people tend to break it down faster.

The curve in the chart

The curve shown illustrates the modelled course of THC concentration in the body over time. It falls off exponentially, faster at first, then more slowly, until it finally drops to zero. The exact course can differ greatly in reality.

Note

This tool is no substitute for medical advice and has no legal validity. It serves as rough orientation for those interested. For binding results, lab-based tests are required.

Typical THC breakdown and detection times

The overview below shows average reference values for the detectability of THC and its metabolites in various tests. The actual values can vary greatly depending on the body, consumption habits and test method.

Type of use	Urine	Blood	Saliva	Hair
One-time use	2-4 days	6-24 hours	6-12 hours	up to 90 days
Occasional use (1-2× per week)	5-10 days	12-48 hours	1-2 days	up to 90 days
Regular use (several times per week)	10-21 days	2-7 days	1-3 days	up to 90 days
Daily or heavy use	21-60 days or more	7-14 days	2-5 days	up to 90 days +

⚠️ These figures are average values from anecdotal reports and forensic studies. Individual variation is possible.

Note: this calculation provides only a rough estimate.
No medical statement or legal basis.

Author: Der Knospenzwirbler

‘Der Knospenzwirbler’ has been part of our company for over 20 years and has witnessed several generations of cannabis culture: from the early days right through to today’s developments. His many years of practical experience and his deep understanding of products, materials and trends make his contributions particularly valuable. ‘Der Knospenzwirbler’ is a pseudonym, but behind the name lies a real person with genuine experience. His writing is insightful, easy to understand and always packed with substance rather than empty hype.