Drug Detection Time Calculator
Estimate how long substances stay in your system by test type.
Track Your Recovery Journey
Get real-time tracking, daily check-ins, crisis support, and community — all in one free app.
Frequently Asked Questions
How long does marijuana stay in your system?
Marijuana detection times vary widely depending on usage frequency. For a single use, THC may be detectable in urine for 3-4 days, but for daily or chronic users, it can be detectable for 30 days or more. Blood tests detect THC for 1-2 days (up to 7 for heavy users), saliva tests for 24-72 hours, and hair tests for up to 90 days. THC is fat-soluble, meaning it is stored in fat cells and released slowly, which is why heavy users test positive much longer than occasional users.
What factors affect drug detection times?
Several factors influence how long a substance remains detectable: frequency and amount of use (chronic users retain substances longer), body fat percentage (fat-soluble substances like THC last longer in people with higher body fat), metabolism rate, age, hydration level, overall health and liver or kidney function, and the specific test being used. Hair tests generally have the longest detection window at 90 days, while saliva tests typically have the shortest.
Which drug test has the longest detection window?
Hair follicle tests have the longest detection window, capable of detecting most substances for up to 90 days after last use. This is because drug metabolites are incorporated into the hair shaft as it grows. A standard hair test analyzes 1.5 inches of hair closest to the scalp, representing approximately 90 days of growth. Hair tests are harder to cheat but are more expensive and less commonly used than urine tests.
Can you speed up how quickly a drug leaves your system?
There is no scientifically proven way to significantly speed up drug elimination. Your body metabolizes substances at its own rate based on liver and kidney function. Staying hydrated, exercising, and eating well support overall health but will not dramatically shorten detection times. Products claiming to "flush" drugs from your system are largely ineffective and unreliable. The only guaranteed way to pass a drug test is to abstain from substance use for the full detection window.
How accurate are these detection time estimates?
The detection times provided are based on published clinical research and represent typical ranges for standard testing methods. However, individual results can vary significantly due to personal metabolism, usage patterns, body composition, and the sensitivity of the specific test used. These estimates should be used for educational purposes only. If you need precise information for legal or medical reasons, consult a healthcare professional or toxicologist.