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Prep for Your Drug Test with Our Online THC Calculator

Welcome to the 21st century, ladies and gentlemen. In addition to being able to smoke weed out of futuristic James Bond-looking devices, we now live in an age where we can grow pot for specific genetic traits, drink cannabis-infused water for its reported health benefits, and (for better or worse), jam-pack a dime-sized piece of concentrated hash oil with up to 99% THC extract.

And now, believe it or not, we can even use a THC drug test calculator to estimate the amount of active weed metabolites in our system prior to taking a marijuana drug screening.

Try Our Online THC Calculator and See How You Score:

That’s right – if you’ve ever wondered how long does marijuana stay in your system , you can use a calculator-like device to record specific personal information (age, weight, height, etc) and give you an estimation of how much traceable THC is likely to be in your body’s cell and tissue systems (including urine, blood, hair, and saliva) at any given moment.

In this discussion, we go over what exactly marijuana drug tests are, how they work, and how you might be able to use a THC drug test calculator (try ours out down below!) to increase the likelihood of passing your next randomized drug screening.

Enjoy, pot lovers everywhere — and welcome to the future!

What Is a THC Drug Test?

If you’ve ever interviewed for a job before, you’re likely already somewhat familiar with the horribly awkward (and inconvenient) process of a THC test. You know how it goes – the drug test lady hands you a sterilized plastic cup, stands three feet away from you (in a dead-silent bathroom), and waits impatiently while you try and “fill ‘er up.”

But did you know that the majority of these THC tests don’t actually test for THC itself? Rather, most of them are actually designed to screen for the presence of THC-COOH, which is a metabolic byproduct of THC that exists in our bodies after the active compound has been broken down by the liver.

Did you know that the majority of THC tests don’t actually test for THC itself? Most of them are actually designed to screen for the presence of THC-COOH, which is a metabolic byproduct of THC.

The “Three-Step THC Process”

You might actually think of smoking weed as a “three-step THC process”:

  1. In the first step, the THC in the raw marijuana flower actually exists as THC-A, which is a non-psychoactive acidic version of the active compound. As soon as we fire up the joint (or bowl, or vaporizer, etc), the heat causes the THC-A to decarboxylate into THC, which of course is the active compound that accounts for our beloved marijuana high.
  2. The second step is the actual process of inhalation (and absorption) into the bloodstream. As soon as the THC-A combusts, it immediately “turns into” THC, at which point we inhale it into our lungs. Once in our lungs, it can absorb into the bloodstream and travel to every nook and cranny of the body to work its magic.
  3. The third step is the metabolic process that breaks THC down into THC-COOH, which as we said, is the compound that’s actually screened for during a marijuana drug test. Once broken down by the liver into THC-COOH, the metabolite will “travel” to various parts of the body (typically hair cells and fat deposits), where it can stay for days, weeks, or even months.

Of course, this is where the THC test comes in. Depending on what type of screening you’re having, THC tests can scan for metabolites in the urine, skin, hair, nails, blood, or even saliva. Generally speaking, THC-COOH is detectable in the hair for the longest period of time (sometimes as much as 90 days), while it is detectable in the blood and saliva for the shortest amount of time (between 1 and 7 days). Depending on your body size and how often you smoke weed (and also on the THC dosage/potency of the strain you’re smoking), urine tests can detect THC metabolites for up to 80 days, though the common time frame is between 10 and 30 days.

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Check out this article for a much more in-depth look at THC detox and dosage and the number of times metabolites are detectable in your body.

What Is a THC Calculator?

A THC calculator is exactly what it sounds like it is: an online calculator where you punch in some numbers (and other data), and it spits out a “guesstimated” answer of how long THC is likely to stay in your system.

Technically speaking, a THC calculator is actually a drug half-life calculator, as it estimates the amount of time it will take for THC metabolites in your system to be broken down into smaller, “non-traceable” compounds.

One important thing to keep in mind though, is that this is NOT an exact science – here at WayofLeaf we have spent a considerable amount of time putting together and programming our very own THC calculator (check it out down below), but we are certainly not able to claim that it is 100% accurate.

In other words, if you use our calculator and it estimates that THC will be in your system for 17-24 days, yet you fail a drug test after say, 28 days, don’t come back and blame us!! At the end of the day, the calculator is designed for estimation purposes only.

How Can a Marijuana Calculator Help You Prepare for an Important Drug Test?

That being said, however, using a drug half-life calculator – even for simple estimation purposes – can no doubt help you figure out your best plan of attack for passing an upcoming THC test.

There are a wealth of very specific (and fairly efficient) THC detox kits and drinks out there on the market. But not having a general idea of how long THC might be in your system for can create road bumps. You won’t have any idea of which one to buy, or how to go about using the one that you do buy.

Moreover, getting the wrong detox supplements (i.e. if you only get a 10-day program even though THC will probably be in your system for 28+ days), can significantly reduce the chances of passing your test. And it’ll waste some serious cash on an expensive kit. Nevertheless, a THC calculator can be a great tool in terms of helping you plan for an upcoming drug test.

What Do the Drug Test Calculator Results Mean?

Again, remember the results of the weed calculator should not be taken as a 100%, set-in-stone truth. Rather, the numbers given to you should simply be used to estimate. This can help plan what kind of a detox program you need. In turn, this ensures the best possible chance of passing your THC test.

Let’s use a specific example to help explain how to go about using the calculator’s results.

Here is the basic information you’ll have to input to get the most accurate data for your individual circumstances:

  • First, you’ll need to select whether you want to use imperial or metric units (inches vs. centimeters, pounds vs. kilograms)
  • Then you’ll need to select whether you are male or female
  • Then put in your weight ( either lbs or kg, depending on the units you selected) followed by:
  • Your age
  • Your height (either inches or centimeters)
  • How often you use cannabis (provide your best estimation)
  • What is your medical condition? (If you don’t use weed to treat a specific medical condition, just select “recreational use”)
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Once you’ve entered in all of the requisite information, you’ll simply click “calculate.” The marijuana calculator will crunch some numbers. This will give you an accurate estimation of how long you can expect THC to be in your system for!

How to Use a Weed Calculator for Maximum Personal Benefit

Most people use the THC calculator to help determine what kind of a detox kit they’ll need to get to help them pass an upcoming marijuana drug test.

Some people are in a position of good fortune. For example, if your employer is letting you select your own dates to take the test. Additionally, if you have to supply a drug test on your own through a third-party company. Here, you can use the THC calculator to help determine when would be the most appropriate timeframe to have the urinalysis (or hair/blood/saliva screening) done.

Moreover, you could potentially use the results of the weed calculator to save money on high-end detox kits. Some of the best detox programs out there can cost upwards of $200. These are usually for long-term “permanent cleanse” programs that take a minimum of 14+ days. However, if the calculator estimates that THC will likely only be in your system for 7-14 days, you could perhaps just get one of the 7 or 10-day kits for substantially less money.

At the end of the day, it is entirely up to you to use your best judgment. You get to decide what you do with the results of the THC calculator. We’ll say it again that the results should not be taken as 100% accurate. So bear that in mind when making any important decisions regarding drug testing or THC screening.

Check Yourself Using Our Drug Detection Calculator

Now comes the FUN PART! You can use our THC drug test calculator below to input your personal information. But make sure you enter everything as accurately as possible. After this, you can see how long THC metabolites will be expected to stay in your system for!

If you’ve got an upcoming drug test for marijuana, though, we always advise planning for the maximum amount of detox/abstinence time possible. In other words, if the calculator estimates that THC will be in your system for 7-10 days, yet you know you don’t have to take the marijuana test for 14 days, then go ahead and wait that entire 14-day period (if possible) so you can be on the safe side with regard to passing the test.

Will I Pass My Drug Test?

Calculators Don’t Lie… but They Also Don’t Guarantee Anything!

To close, we’ll go ahead and reiterate the fact that this THC detox calculator SHOULD NOT be used as a guarantee that you’ll pass an upcoming marijuana drug test!

It should probably go without saying that if you’re trying to determine how much weed is in your system, a calculator is not the surest thing in the world to provide the most accurate results. Even experts in the field who do this type of stuff on a daily basis claim that it is extremely difficult to gauge exactly how long THC will stay in any one person’s system. There are just so many variables to take into consideration (age, weight, frequency of use, diet, exercise routine, etc.).

At the end of the day, the most foolproof way to pass a marijuana drug test is to simply abstain from smoking weed for as long as possible!

We know that’s probably not what you wanted to hear. But sometimes you just gotta suck it up and do what you gotta do to make things happen.

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Of course, though, if you’re in an absolute jam and a THC test has snuck up on you out of the clear blue, you can always resort to a fast-acting same-day detox cleanse to drastically enhance the chances that you’ll pass the test – even if you smoked a ton of weed the day before!

Want to know how long THC can stay in your system? Try out our Online THC Calculator at the top of the page.

Calculator for the production of a limited amount of cannabis for medical purposes

This calculator is a tool you can use if you are applying to register with Health Canada to:

  • produce a limited amount of cannabis for your own medical purposes or to
  • designate another person to produce it on your behalf

Use the calculator for the production of a limited amount of cannabis for medical purposes to find out:

  • how many marijuana plants you or the person you have designated may be able to produce
  • how much dried marijuana or its equivalent you or the person you have designated may be able to store

What you need to know

Under the Access to Cannabis for Medical Purposes Regulations (ACMPR), you or the person you have designated may only begin producing cannabis after you receive a registration certificate from Health Canada.

Registering with Health Canada requires you to apply and submit an original medical document from your health care practitioner.

Once you have a registration certificate, you may want to register with a licensed producer to order:

  • plants and/or seeds as starting materials
  • an interim supply of fresh or dried marijuana, or cannabis oil

You may want to access this interim supply option:

  • while you wait for your first harvest
  • if your crop is not successful and you don’t have enough cannabis in storage to meet your needs

Plant and storage limit calculator

The number of plants that may be grown and the amount of dried marijuana that can be stored is limited. This limit is based on a formula in the ACMPR that takes into account:

  • the daily amount, as authorized by your health care practitioner
  • the average yield of a plant under certain growing conditions, such as indoor or outdoor growing
  • the number of growth cycles expected in a year

The following calculator is for reference purposes only.

You or the person you have designated may only begin to produce marijuana plants once you receive a registration certificate from Health Canada.


Please enter your authorized daily grams, select indoor and/or outdoor and press “Calculate” for results.

Calculate public possession limits for cannabis

The law says that an adult may possess up to 30 grams of legal, dried cannabis, or its equivalent, in public.

Dried Cannabis

Dried cannabis amounts or dried cannabis equivalency amounts displayed on the label for other cannabis products purchased at retail

Fresh Cannabis

Freshly harvested cannabis buds and leaves

Solid Containing Cannabis

Solid at room temperature, with a concentration of THC less than 3% (for example: baked goods)

Non-solid Containing Cannabis

Not a solid at room temperature, with a concentration of THC less than 3% (for example: beverages)

Cannabis Concentrate

Concentration greater than 3% THC, and may be solid or non-solid (for example: hash, vaping liquid)