The right THC dosage is the smallest amount that gives you the effect you want, and for most new consumers that's less than they expect. This guide gives you real numbers to work with. It explains the standard THC unit, offers a milligram chart by experience and shows how dosing changes from edibles to vapes. You'll also find the math for labels and homemade batches, and a calm plan if you take too much. The short version is the oldest advice in cannabis: start low and go slow.
What a standard THC unit means
In 2021, the federal government's National Institute on Drug Abuse named 5 mg of delta-9 THC its standard THC unit for research. NIDA expects the researchers it funds to report THC amounts in multiples or fractions of that unit, which gives studies a common measure. It's a measuring stick, not a recommendation: NIDA says the unit doesn't indicate safety or endorse any amount as advisable.
It's still a handy reference for you. A 10 mg gummy holds two standard units, and a 2.5 mg piece holds half of one. Thinking in units helps you compare an edible, a tincture and a drink on the same scale.
THC dosage chart by experience level
Use this chart as a rough starting point for edibles and other products you swallow. It isn't medical advice, and your right amount may be lower.
| Experience | Where to start (THC) | What to know |
|---|---|---|
| New, or back after months away | 2.5 mg or less | Canadian public health guidance for a first edible |
| Some experience | Your last dose that felt comfortable | Make small changes, one at a time |
| Regular use | Varies with tolerance | 10 mg is the most one Michigan adult-use serving can hold |
| Any level | Less than you think | Larger amounts make anxiety and panic more likely |
Experience is only one input. Your body, what you've eaten and how often you use cannabis also matter, and Health Canada notes that your response can differ from one time to the next. If you take medications or have a health condition, talk with your clinician first.
How dosing differs by product
The same milligram of THC can feel very different depending on how it enters your body. Swallowed THC is absorbed through the gut and partly turned by the liver into a stronger form, 11-hydroxy-THC, so it starts slowly and lasts a long time. Inhaled THC passes from the lungs into the bloodstream and is felt in seconds to minutes.
| Product | How it's measured | When you may feel it | How long it can last |
|---|---|---|---|
| Edibles and capsules | mg per piece or serving | 30 minutes to 2 hours; full effect can take up to 4 | 4 to 12 hours, sometimes longer |
| Drinks | mg per serving and per container | Similar to edibles; varies by product | Similar to edibles |
| Tinctures | mg per mL or per container | Varies; whatever is swallowed acts like an edible | Like an edible, for what's swallowed |
| Flower and vapes | % THC; count your puffs | Seconds to minutes; full effect can take up to 30 minutes | Up to 6 hours |
| Concentrates | % THC, in tiny portions | Seconds to minutes | Up to 6 hours, and very strong per portion |
A few product notes:
- Edibles and drinks. Read the label for mg per serving and per package. Waiting is the hard part: in one controlled study, effects from a THC brownie took 30 to 60 minutes to show up and peaked 1.5 to 3 hours after it was eaten. Our cannabis chocolate guide shows how to portion a bar.
- Tinctures. A dropper makes small amounts easy to measure. Check the mg per mL and use the markings on the dropper.
- Flower and vapes. You can't measure a puff in milligrams, so pace by puffs. Canadian health officials suggest new consumers begin with one or two puffs of a product with 10% THC or less.
- Concentrates. Even a rice-grain-sized portion can hold a large dose. Save them for when you know your tolerance.
Putting 10, 20 and 100 mg in context
Numbers on a package are easier to judge when you have something to compare them with.
- 10 mg is the most THC a single adult-use serving can hold in Michigan, and two standard units. In a controlled study, healthy adults who hadn't used cannabis in at least 60 days ate THC brownies. At 10 mg, they could notice the drug's effects and had a faster heart rate, though test performance held steady. So, does 10 mg count as a lot? For someone new, it can.
- 20 mg is two full servings. In the same study, 25 mg produced pronounced effects and markedly impaired thinking and coordination, and one participant vomited at that dose. The study didn't test 20 mg, so approach it with similar caution if you have little tolerance.
- 100 mg is ten servings, and it's the most THC a single Michigan cannabis drink container can hold. That's ten servings, not one.
- 200 mg is the maximum for a package of adult-use edibles: twenty servings.
How to calculate your dose
Packaged products
Take the milligrams in the whole package and divide by the number of servings. A 100 mg chocolate bar with 10 squares has 10 mg per square, so half a square holds 5 mg and a quarter holds 2.5 mg. For a tincture, multiply the mg per mL by the amount you take: at 10 mg per mL, a quarter milliliter holds 2.5 mg. Our guide to reading a cannabis label shows where to find these numbers.
Homemade edibles
You don't need an edible dosage calculator, just three steps:
- Find the THC in your flower. Multiply its weight in grams by 1,000, then by its THC percentage as a decimal. For 3.5 g of flower at 20% THC, that's 3,500 × 0.20 = 700 mg.
- Divide by servings. If the batch makes 70 pieces, each holds at most 10 mg.
- Use the result as a ceiling. Some THC is lost during heating and infusion, and homemade batches rarely mix evenly, so the real amount varies from piece to piece.
Because homemade strength is uncertain, try a quarter or half piece first and wait at least 2 hours.
Finding your personal dose: start low and go slow
Good cannabis dosing comes down to small changes and honest notes. Whether you're wondering how much cannabis you should take the first time or how to dose cannabis from a new product, the method is the same:
- Pick one product and one format. Switching products changes both the dose and the timing.
- Start at the low end. For an edible, that's 2.5 mg of THC or less.
- Wait it out. Give an edible at least 2 hours before you consider more. With a vape, wait between puffs: inhaled cannabis can take up to 30 minutes to reach full effect.
- Keep a simple log. Note the product, the amount and how the session felt.
- Adjust one variable per session. Raise the amount by a small step only after a session that felt comfortable.
- Keep the setting steady. Same time of day, similar meals, no alcohol.
A tracking log can be as simple as this:
| Date and time | Product and mg | With food? | First felt it | How it felt at its peak | Next time |
|---|---|---|---|---|---|
| Sat., 7 p.m. | Gummy, 2.5 mg | After dinner | About 1 hour | Mild and relaxed | Same dose |
| Next Sat., 7 p.m. | Gummy, 5 mg | After dinner | About 1 hour | Too strong, restless | Back to 2.5 mg |
After a few entries, your personal dose usually comes into focus. Our microdosing guide covers very small amounts in more detail.
What changes how THC feels
- Tolerance. Regular use builds tolerance, so a dose that once felt strong may feel mild. A break may bring it back down, so start low again when you return.
- Food. In one study, THC capsules taken after a high-fat meal peaked later but reached higher blood levels than on an empty stomach, so the same dose can land differently with food.
- Your body. Health Canada lists sex, age and health conditions among the things that change how cannabis affects you.
- Setting and mood. Many people find a calm, familiar place with people they trust makes for a steadier experience.
- Alcohol and other substances. The CDC says using alcohol and cannabis together is likely to cause greater impairment, and Canadian public health guidance advises against mixing them.
- The product itself. Higher-THC products leave less room for error.
Took too much THC? Calming steps and when to get help
Taking too much THC is unpleasant, but it passes. The signs are like the usual effects, only stronger: a fast heart rate, anxiety, panic or paranoia, severe nausea or vomiting, and extreme confusion. A fatal overdose caused only by cannabis is unlikely, but cannabis isn't harmless.
If you overdid it:
- Stop taking more, including "just a little" to take the edge off.
- Move somewhere calm and comfortable, and sit or lie down.
- Sip some water if you can.
- Breathe slowly. This feeling is temporary, and it will pass.
- Ask someone you trust to stay with you.
- Don't drive or go anywhere until it has worn off.
Get help when it's more than discomfort. Call Poison Control at 1-800-222-1222 for advice, and call 911 in an emergency, such as if someone is unconscious or having trouble breathing. If a child eats cannabis, call Poison Control right away; if a pet does, call Poison Control or your vet. For more ways to come down, see our guide to getting unhigh.
Shopping by the milligram at High Society
Michigan's limits make labels easy to compare. Under the state's current caps for adult-use products:
| Adult-use product | Max THC per serving | Max THC per package |
|---|---|---|
| Edibles | 10 mg | 200 mg |
| Capsules, tinctures and oil drops | 10 mg | 200 mg |
| Drinks | 10 mg | 100 mg per container |
At High Society, edibles from gummies to chocolates sit on the menu alongside flower, pre-rolls, vape pens and concentrates. Check your store's menu to compare milligrams per serving, order ahead for in-store or curbside pickup, and ask our budtenders to help you compare serving sizes. Bring a valid government-issued ID or passport: shopping is for adults 21 and older, or 18 and older with a valid medical marijuana card. Find your nearest store.
