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Edible Dosage Calculator

Enter the THC on your package and the number of pieces. The calculator shows the THC in each piece and a cautious starting dose for your experience level, based on public health guidance.

Your edible

Your experience with cannabis

THC in each piece

10 mg

Suggested starting dose

1 to 2.5 mg

That is about

1/8 to 1/4 of a piece

Cut the piece with a clean knife, take one portion, then wait at least 2 hours before deciding on more.

This is an educational estimate, not medical advice. Ask your doctor first if you take other medicines, are pregnant or breastfeeding, or have heart or mental health conditions.

Edible timing: start low, go slow

  • 30 min to 2 hoursTypical time before you feel effects
  • Wait 2+ hoursBefore you think about taking more
  • Around 4 hoursWhen effects often peak
  • 6+ hoursNo driving or machinery

Eaten THC passes through your liver, which turns it into a stronger compound called 11-hydroxy-THC. That is why edibles take longer to start and can feel stronger and last longer than smoking or vaping the same amount. Effects can last 12 hours or more.

How the calculator works

  1. THC per piece is the total THC on the label divided by the number of pieces.
  2. The starting range comes from your experience level: 1 to 2.5 mg if you are new, 2.5 to 5 mg for occasional use, 5 to 10 mg for regular use.
  3. The portion shows how much of one piece fits that range, rounded to an easy fraction you can cut.

Product labels can be off, and homemade edibles are rarely even. If you are unsure, use the smaller amount.

Safety checklist

  • Do not mix with alcohol or sedatives.
  • Do not drive for at least 6 hours.
  • Store edibles locked and away from children and pets.
  • Eat a snack first and keep water nearby.
  • Use only products from a licensed dispensary.

Medical use

Get dosing advice from a physician

A medical marijuana evaluation with a physician licensed in your state covers your conditions, current medicines and how to start safely. You pay only if you are approved.

Start Evaluation See prices by state

Edible dosing questions

How much THC should a first edible have?

Health agencies advise new users to start with 2.5 mg of THC or less. Ontario Cannabis Store guidance says to start low, go slow, and wait before taking more, because edible effects build gradually.

How long do edibles take to kick in?

Effects usually begin 30 minutes to 2 hours after eating, can peak around 4 hours, and may last 12 hours or longer. Food in your stomach, your metabolism and the product all change the timing.

How long should I wait before taking more?

Wait at least 2 hours, and ideally until the next day, before taking more. Taking a second dose too early is the most common reason people feel uncomfortably high from edibles.

How do I work out the THC in one piece?

Divide the total THC on the package by the number of pieces. A 100 mg package with 10 gummies has 10 mg per gummy, so a 2.5 mg starting dose is about a quarter of one gummy.

Is it safe to drive after an edible?

No. Do not drive or operate machinery after using cannabis. Impairment from edibles can last 6 hours or longer, and driving while impaired is illegal in every state.

What should I do if I take too much?

Find a calm place, drink water and wait, since the effects will pass. Call Poison Control at 1-800-222-1222 for advice, or 911 for chest pain, trouble breathing, seizures, or if a child or pet ate an edible.

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Sources

Reviewed by the Kif editorial team under our editorial policy. This page is for education and does not replace advice from your doctor.