Detection window estimator

THC lingers far longer than its effects. These are rough, typical ranges, real results vary enormously between people. Treat this as a ballpark, never a guarantee.

1 How often do you use?

2 Which test?

Typical detection window

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Important: these are estimates only, not medical or legal advice. Detection depends on your metabolism, body fat, hydration, dose, and the test's sensitivity. Detection is not the same as impairment, you can test positive long after the effects are gone. Never use this to judge whether you're safe to drive. See the full guide and cannabis and driving.

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