Enter your THC usage, body weight, and activity level into the calculator below to determine the number of days needed to be drug-free in order to pass a urine test.

How long will THC stay in my body? 

Here’s a general guide of how long cannabis can stay in your urine for:

  • Single-use ( once in a 30 day period): up to 8 days
  • Regular use (4-6 times over a 30 day period): up to 15 days
  • Frequent use (10 – 15 times over a 30 day period): up to 30 days
  • Heavy use (20+ times in a 30 day period): up to 45-77 days

All of these estimations can be affected by weight, body fat, and activity level. 

How can i increase my chance of passing a THC drug test?

First and foremost, you need to stop smoking this second if you still are. Most people aren’t in a position to risk failing a drug test. 

The next thing you can start doing is exercising a ton, particularly cardio exercise which will burn fat. THC is stored in your fat cells. In order to get rid of those THC molecules faster, you need to burn off those stores of fat by increasing your activity level.

This can also be done by decreasing the amount of food you eat, but ideally, it’s done by a combination of both. 

Another thing you should start doing up until the drug test is drinking tons of water. The more water you drink the more diluted your pee is going to be. This will help hide any trace amounts of THC.

Be careful with this method though. Sometimes if your pee is too diluted it will count as a failed drug test or you will have to do it again. 

There’s also always the non-ethical option…using someone else pee. We don’t personally condone this, but sometimes you have to do what you have to do…

THC Blood Tests and Hair Tests

Surprisingly, THC does not stay in the blood longer than it shows up in urine. This is contrary to most drugs, and the main reason why it’s tested for with a urine test.

That and the fact that they are much cheaper. THC will only stay in the bloodstream for an average of 2-5 days, regardless if usage. 

Hair Tests for THC are a little more complicated and less used. THC will typically only show up on hair tests anywhere from a week to a month after use, but some tests are more accurate.

Extremely expensive tests can detect THC in the hair for up to 6 months after use, but these are almost only ever used in a research setting. 


THC is the psychoactive compound in marijuana that gets you high. CBD is the non-psychoactive compound that gets you hungry. CBD is not tested for in drug tests and is considered a legal supplement. 

CBD is currently being explored as a supplement for helping aid in pain management.