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Estimate how long THC metabolites remain detectable based on usage patterns and body factors
Average: Men 18-24%, Women 25-31%
| Usage Pattern | Urine | Blood | Saliva | Hair |
|---|---|---|---|---|
| Single Use | 3 days | 1-2 days | 1 day | Usually undetectable |
| Occasional (2-4x/month) | 5-7 days | 2-3 days | 1-3 days | 90 days |
| Moderate (5-6x/week) | 10-15 days | 3-4 days | 1-3 days | 90 days |
| Daily User | 15-30 days | 7 days | 1-3 days | 90 days |
| Heavy/Chronic | 30-90+ days | 7+ days | 1-3 days | 90 days |
THC binds to fat cells and is slowly released over time. Higher body fat = longer detection windows.
Tests detect THC-COOH, a metabolite stored in fat. It is eliminated much slower than THC itself.
Regular use builds up THC stores in fat tissue. Heavy users may test positive for months after stopping.
Burning fat releases stored THC. This can actually increase levels temporarily, so avoid exercise 1-2 days before testing.
50 ng/mL (screening) / 15 ng/mL (confirmation)
50 ng/mL initial / 15 ng/mL confirmatory
1-5 ng/mL (varies by jurisdiction)
1 pg/mg (detects use, not impairment)
Note: Some employers use lower cutoffs (20 ng/mL). Military and DOT use standard 50 ng/mL.
For a single, isolated use: possibly within 3-5 days for urine. For regular users: unlikely. THC metabolites accumulate in fat tissue and take weeks to clear. Blood and saliva tests have shorter windows but are less common.
Staying hydrated is healthy but does not significantly speed up THC elimination. Drinking excessive water before a test can dilute your urine, but labs check for this and may flag diluted samples as inconclusive.
Most detox products work by diluting urine or masking metabolites temporarily. They are not reliable, and many labs can detect adulterants. The only guaranteed method is abstinence and time.
THC accumulates in fat tissue with regular use. When you stop, stored THC is slowly released as fat is metabolized. Heavy users may have substantial reserves that take 30-90+ days to clear completely.
Under normal conditions, secondhand exposure is unlikely to cause a positive test at standard cutoff levels. However, extreme exposure (unventilated room, prolonged contact) could potentially cause low-level detection.
Pure CBD should not trigger a positive THC test. However, many CBD products contain trace amounts of THC (up to 0.3% legally). Regular use of full-spectrum CBD products can potentially cause a positive result.
This calculator provides estimates only. Individual results vary significantly based on many factors including genetics, hydration, diet, and product potency. Legal status of cannabis varies by jurisdiction. This tool is for informational purposes only and does not constitute medical or legal advice.
The primary psychoactive compound in cannabis. It is rapidly metabolized by the liver but its metabolites persist much longer in the body.
The main metabolite detected in drug tests. It is not psychoactive but is stored in fat cells and released slowly over days to weeks.
THC has a half-life of 1-10 days depending on usage. For infrequent users: 1.3 days. For heavy users: 5-13 days due to fat tissue accumulation.