Estimate how long THC stays in your system based on your usage pattern, body type, and metabolism.
Your Cannabis Profile
Your Estimated Clearance Times
Estimates based on published detection window research. Individual results vary. Do not rely on this for legal or employment decisions.
How THC Clearance Works
THC (tetrahydrocannabinol) is fat-soluble, meaning it binds to adipose tissue and is released slowly into the bloodstream over time. Drug tests detect THC-COOH — a metabolite produced by your liver as it processes THC.
The main variables: usage frequency (more use = more accumulation), body fat (higher fat = longer storage), and metabolism (faster = quicker processing).
Detection Windows by Test Type
Test Type
One-Time Use
Daily Use
Heavy Use
Urine
3–5 days
10–21 days
30–60+ days
Blood
12–24 hrs
3–7 days
7–14 days
Saliva
24–48 hrs
24–72 hrs
72 hrs
Hair
Up to 90 days
Up to 90 days
Up to 90 days
Frequently Asked Questions
How accurate is this calculator?
Evidence-based estimates from published THC pharmacokinetics research. Individual results vary significantly. Use as a general guide only.
Can drinking water speed up clearance?
Water does not flush THC-COOH from fat tissue. Excess hydration on test day dilutes urine, which labs flag as invalid — often treated as a failed test.
Does exercise help clear THC faster?
Long-term regular exercise reduces body fat and speeds metabolism. However, intense exercise 24–48 hours before testing can temporarily spike THC-COOH levels in urine.
