CBD Dosage: The Complete Canadian Guide (with Free Calculator) — 2026

TL;DR: There is no universal CBD dose. A reasonable starting point for most adults is 0.25–1.0 mg per kg of body weight per day, split AM/PM, held for 5–7 days, then titrated up in 5 mg increments if needed. Beginners halve that. People taking prescription medications should check for drug interactions before starting.

🧮 Skip ahead: try the calculator

If you want a personalised starting dose right now, use our free interactive CBD dosage calculator →. It accounts for body weight, experience, severity, product type, and what you’re using CBD for.

Then come back here for the full reasoning behind the math.

Why “how much CBD” is the wrong question to ask first

If you’ve searched “how many mg of CBD should I take,” you’ve probably noticed something frustrating: every source gives a different answer. That’s not because nobody knows. It’s because the question is incomplete.

CBD dosing isn’t like ibuprofen, where a 70 kg adult and a 90 kg adult take the same 400 mg tablet. CBD behaves more like caffeine, melatonin, or alcohol — the dose that works for you depends on a handful of personal variables, and the only way to find your number is to start low and pay attention.

This guide walks you through the three variables that actually matter, gives you concrete starting numbers, and explains how to adjust from there. It replaces three earlier articles on this site (a dosage chart, a weight-based guide, and a generic dosing primer) with one consolidated reference. The math is exactly what powers our free calculator.

The three things that actually determine your CBD dose

1. Body weight

Heavier bodies have more endocannabinoid receptors and a larger volume of distribution. That’s why CBD dosing in research studies is almost always expressed as mg per kilogram of body weight, not as a fixed mg number. A 50 kg adult and a 110 kg adult shouldn’t take the same dose any more than they’d drink the same amount of alcohol and expect the same effect.

The starting range from the published literature is roughly 0.5 to 1.5 mg/kg/day for general wellness, with higher ranges (up to 6 mg/kg in some clinical contexts) reserved for medically-supervised use. Recreational and over-the-counter CBD users typically need much less than the clinical maximum.

2. What you’re using CBD for

Different symptoms respond at different dose ranges:

Anxiety and stress often respond at the low end of the range. Counterintuitively, larger doses can be activating for some people. Start at 0.25–0.5 mg/kg.
Sleep onset tends to need a moderate dose taken 30–60 minutes before bed. 0.5–1.0 mg/kg is a common sweet spot.
Chronic pain and inflammation usually need the higher end. 1.0–1.5 mg/kg, sometimes more, often combined with a topical for site-specific relief.
General wellness / preventative use is a moderate dose, taken consistently, ideally split AM/PM. 0.5–1.0 mg/kg.

If you have multiple goals (e.g. sleep and joint pain), dose for the higher-need symptom and adjust timing rather than stacking doses.

3. Your experience with CBD

The first week of CBD is when you’re most likely to notice side effects — mild drowsiness, dry mouth, an occasional change in appetite. Starting at half the suggested dose for 5–7 days lets your body adjust, and it makes it much easier to read whether the dose is working before you push it higher.

Experienced users with established tolerance can start at the calculated dose directly, or even nudge it up by 25%. New users should always halve and hold.

The method: start low, go slow

This is the single most important section in this guide. Anyone who’s tried CBD and said “it didn’t do anything” almost always either underdosed (gave up after one day at 5 mg) or overdosed (took 100 mg the first time and felt sleepy/spacey). The method that works is boring on purpose:

Day 1–5: Take your starting dose. Note how you feel. No changes.
Day 5–7 check-in: Is the symptom you’re targeting better, worse, or the same? Any side effects?
If better and no side effects: hold this dose. You’ve found your number.
If no change: increase by 5 mg/day. Hold another 5–7 days. Re-check.
If side effects: drop back to the previous dose. Hold longer.

Most people land on their personal dose within 2–4 weeks of this process. The patience pays off — you avoid the wasted-product spiral of guessing.

Starting doses by body weight

The table below gives a beginner-friendly starting dose at three severity levels. Halve these numbers if it’s your first week. Hold each dose for 5–7 days before adjusting.

Body weight	Mild symptoms	Moderate symptoms	Severe symptoms
45 kg / 100 lb	10–15 mg	20–25 mg	35–40 mg
57 kg / 125 lb	15–20 mg	25–30 mg	40–45 mg
68 kg / 150 lb	15–20 mg	30–35 mg	50–55 mg
80 kg / 175 lb	20–25 mg	35–40 mg	55–60 mg
91 kg / 200 lb	20–25 mg	40–45 mg	65–70 mg
102 kg / 225 lb	25–30 mg	45–50 mg	70–75 mg
113 kg / 250 lb	25–30 mg	50–55 mg	80–85 mg

Daily starting doses for adults with established tolerance. Halve for your first week. Numbers from the Bonn-Miller et al. 2018 dosing review and clinical-anxiety trial ranges.

If you fall between rows, interpolate or round down. The calculator handles this automatically.

Dosing by what you’re using CBD for

CBD for sleep

For sleep, the timing matters as much as the dose. Take CBD oil 30–60 minutes before bed (45 minutes is a good default), or a gummy 60–90 minutes before bed (edibles peak slower because they have to clear first-pass metabolism). A single evening dose at 0.5–1.0 mg/kg is the typical starting place.

If you wake at 3–4 AM and can’t fall back asleep, the half-life may be shorter than what your sleep cycle needs — try a sustained-release or full-spectrum product, or split the dose (smaller portion at bedtime, smaller portion at 3 AM if you wake).

CBD for anxiety

Anxiety responds well at lower doses than most people expect. The widely-cited Crippa et al. and Bergamaschi et al. trials used doses in the 300–600 mg range for acute simulated public-speaking anxiety, but for ongoing daily anxiety, sub-1.0 mg/kg is more typical. Some users find that doses above their personal threshold are slightly activating rather than calming — if you notice that, drop down.

Timing for anxiety is usually split AM/PM, with the heavier dose in the morning so you have coverage through the workday.

CBD for pain and inflammation

Chronic pain typically needs the higher end of the dosing range — 1.0–1.5 mg/kg/day to start, sometimes 2 mg/kg with experienced users. For localised pain (a sore knee, an arthritic hand), a topical applied directly to the site often outperforms an oral dose of equivalent mg, because it delivers CBD where you need it without the bioavailability tax of oral routes.

A common pattern that works: a moderate oral dose for systemic baseline relief, plus topical applied 2–3x/day on the painful area.

CBD for general wellness

If you don’t have a specific symptom and you’re using CBD for general endocannabinoid support, consistency matters more than dose. A moderate, twice-daily dose taken at the same times every day will out-perform a bigger dose taken inconsistently. 0.5 mg/kg split AM/PM is a reasonable starting place.

Dosing by product type

CBD oil tinctures

Tinctures are the most flexible format because you can dial in the dose to the mg. The standard math: total bottle mg ÷ bottle ml = mg/ml. A 1000 mg / 30 ml bottle delivers 33 mg/ml. With a standard glass dropper, one drop is approximately 0.05 ml, so each drop is roughly 1.7 mg. The calculator does this conversion for you.

Sublingual absorption (under the tongue, held for 60 seconds) gives bioavailability of roughly 13–19%, much higher than swallowed CBD. Hold the dose under your tongue rather than swallowing it immediately.

CBD gummies and capsules

Edibles and capsules are the easiest to dose consistently — each unit is a fixed mg — but they have the lowest bioavailability (4–20%) because they pass through the liver before reaching circulation (first-pass metabolism). You may need a higher mg dose for the same effective amount of CBD compared to a tincture.

Onset is also slower (60–90 minutes typical) and the effect is longer-lasting (4–6 hours vs 3–4 for a tincture). For sleep, this is usually an advantage. For acute symptom relief, a tincture is faster.

Topicals (creams and balms)

Topical dosing is different in kind. The mg on the label is the total CBD in the container, but you’re not absorbing it systemically — you’re targeting it to the area of application. Effective topicals contain 200–1500 mg per container; the more concentrated the formula and the larger the area you’re treating, the more product you’ll go through. There’s no mg/kg math for topicals — apply enough to cover the affected area in a thin layer, 2–3 times daily.

Vapes and inhalation

Highest bioavailability (30–56%) and fastest onset (5–10 minutes), but shortest duration (1–2 hours). Doses are smaller because of the high absorption — typically 1–5 mg per puff. Inhalation isn’t right for everyone and is regulated separately in Canada — if it’s part of your plan, see the bioavailability guide for the full comparison.

Bioavailability — why the same mg works differently in different forms

The mg on the label is not the mg that reaches your bloodstream. Bioavailability is the fraction that actually gets absorbed and circulated. For CBD:

Inhalation: 30–56% (fastest, shortest)
Sublingual oil: 13–19%
Oral (gummies, capsules, swallowed oil): 4–20%
Topical: not systemic (works locally, no bioavailability comparison)

What this means practically: if you switch product types, your mg may need to change. 25 mg of a tincture (held sublingually) is not the same effective dose as 25 mg in a gummy. The calculator’s product-type selector accounts for this in its translation step.

Read more: bioavailability deep dive →

When to stop and adjust

Side effects — what’s normal, what’s not

Normal, mild, usually settles in 1–2 weeks: mild drowsiness, dry mouth, slight changes in appetite, slight GI changes (loose stools), mild lightheadedness when you stand up too fast (especially at higher doses).

Drop the dose: persistent drowsiness during the day, ongoing GI distress, mood changes, feeling “spacey” or unfocused, headaches.

Stop and check with a healthcare provider: liver-area discomfort or unusual fatigue (CBD interacts with liver enzymes — see drug interactions below), unexpected interactions with prescription medications, persistent symptoms at higher doses.

If it’s not working

Before you abandon CBD entirely, work through this checklist:

Have you actually held a single dose for 5–7 days, or have you been adjusting daily?
Is the product third-party lab tested? Some Canadian products under-deliver mg.
Is the format right for the symptom (e.g. fast-onset for acute issues, slow-onset for sustained)?
Are you at a dose appropriate to your body weight, or are you stuck at a 10–20 mg “safe” dose that’s too low for you?
Is there a confounder — caffeine, alcohol, irregular sleep — that might be masking the effect?

Special cases

Seniors

Older adults often respond at lower doses, partly because of changes in metabolism and partly because of the higher likelihood of being on prescription medications that interact with CBD. Start at half the calculated beginner dose. Watch for orthostatic effects (lightheadedness when standing).

People on prescription medications

CBD inhibits the CYP450 family of liver enzymes — the same family that metabolises a large fraction of common prescription drugs. This is the same mechanism as the “grapefruit warning” on many medications. Real interactions exist with blood thinners, certain antidepressants, antiepileptics, and immunosuppressants among others.

Don’t guess. Bring a list of your medications to a pharmacist or prescribing doctor before adding CBD.

Pregnancy and breastfeeding

Health Canada and the U.S. FDA both advise against CBD use during pregnancy and breastfeeding due to insufficient safety data. This guide is not for anyone in either situation.

Children

Paediatric CBD use is a separate conversation that needs medical supervision (the only Health Canada-approved CBD medication, Epidiolex, is prescribed for specific paediatric seizure disorders). This guide is for adults.

Pets

The same body-weight method applies to dogs and cats, but with stricter limits on THC content and on excipients. The two are not interchangeable — use a pet-formulated product.

Common mistakes

Giving up after one day. CBD usually takes 5–7 days of consistent dosing to show its effect for chronic symptoms. Acute symptoms (acute anxiety, sleep onset) may respond on day one, but most ongoing effects build over days.
Front-loading. Taking a huge dose to “kickstart” things usually produces side effects and tells you nothing about the right dose. Start at the suggested dose, not above it.
Treating mg on the label as mg absorbed. See the bioavailability section. If you’ve moved from a tincture to a gummy and feel less, you probably need a higher mg in the new format.
Inconsistent timing. CBD has a half-life of 1–2 days. For sustained effect, take it at roughly the same times every day.
Stacking with alcohol or sedatives without thinking. CBD compounds the effect of CNS depressants. Take it seriously.
Buying based on price-per-bottle, not price-per-mg. Two bottles can look the same price but one delivers half the actual CBD. Always check mg per ml.

FAQ

How long does it take for CBD to work?

Depends on format. Sublingual oil: 15–45 minutes. Edibles/capsules: 60–90 minutes. Inhaled: 5–10 minutes. Topical: 15–45 minutes for local effect. For chronic symptoms (anxiety, pain) the daily effect builds over 5–7 days of consistent use.

How long does a dose last?

Sublingual: 3–4 hours. Edibles/capsules: 4–6 hours. Inhaled: 1–2 hours. Topical: site-specific, often 3–6 hours.

Can I take CBD daily?

Yes — daily use is the norm for chronic symptom management. Tolerance development is uncommon at typical wellness doses. If you find you need to keep raising the dose to get the same effect, take a 1–2 week break and re-start at the lower dose.

Will CBD show up on a drug test?

Pure CBD does not. Full-spectrum products contain trace THC (less than 0.3% by Canadian regulation) which can accumulate with heavy daily use. If you’re tested for THC at work, choose CBD isolate or broad-spectrum.

Can I overdose on CBD?

CBD has a remarkably high safety threshold — the WHO’s 2018 review found no evidence of CBD overdose in published case literature. That said, high doses (above 200 mg/day) increase the risk of side effects and drug interactions. Stay within the calculated range unless your healthcare provider says otherwise.

What’s the difference between full-spectrum, broad-spectrum, and isolate?

Full-spectrum contains all the compounds in the hemp plant, including up to 0.3% THC. Broad-spectrum is the same minus the THC. Isolate is just CBD. The “entourage effect” argument suggests full-spectrum can be more effective at lower mg — sometimes true, sometimes overstated.

Do I need to take CBD with food?

For oral CBD (gummies, capsules), yes — taking with food, especially fatty food, increases absorption by 4–5x. For sublingual oil, food makes much less difference because the dose is absorbed through the mouth before swallowing.

Health Canada compliance

CBD products in Canada are regulated under the Cannabis Act. Legal CBD must be sold by licensed retailers, must meet Health Canada’s testing requirements, and is not approved by Health Canada as a treatment for any specific medical condition. The information in this guide is general educational content and should not be taken as medical advice. If you have a medical condition, are taking prescription medications, or are pregnant/breastfeeding, consult a qualified healthcare provider before starting CBD.

Going further

If you’ve made it through this guide and want to keep reading: