A medical cannabis tincture dosing calculator converts the total THC in a bottle into milligrams per drop, so you can repeat a dose instead of guessing. The core formula is: mg per mL = total THC mg divided by bottle volume in mL, and mg per drop = mg per mL divided by drops per mL (commonly 20 drops per mL). Example: a 30 mL bottle labeled 300 mg THC equals 10 mg per mL, or about 0.5 mg per drop.
What a tincture dosing calculator actually does
It standardizes three numbers: total cannabinoid content, total liquid volume, and your chosen dose. Once those are known, every dose after that is just arithmetic. The calculator does not decide your dose, it only makes the measurement precise.
How to calculate your tincture dose in 4 steps
- Read the label for total THC mg and bottle size in mL. If the label shows mg per mL, skip step two.
- Divide total THC mg by bottle mL to get mg per mL.
- Divide mg per mL by drops per mL to get mg per drop. Most droppers deliver about 20 drops per mL, though thick oils can run closer to 15.
- Divide your target dose by mg per drop to get the number of drops.
A target of 2.5 mg from a 0.5 mg per drop tincture means 5 drops. That is a manageable starting point for most adults.
Why starting at 1 to 2.5 mg of THC is the standard advice
Oral cannabinoids are absorbed unpredictably, and the same dose can produce very different effects in two people. Clinicians generally recommend starting low and increasing slowly over several days. Keep a written log of dose, time, and effect, because memory is unreliable for this.
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Why drops per mL is the number people get wrong
Dropper size, oil viscosity, and how hard you squeeze all change drop volume. For accuracy above 5 mg, measure in milliliters with an oral syringe instead of counting drops. A 1 mL syringe is the most reliable tool for tincture dosing at home.
Factors that shift your effective dose
- Food in the stomach, which can delay or increase absorption.
- Liver enzyme activity and interactions with other medications.
- Tolerance from regular use.
- Body weight and body fat percentage.
- Whether the product is alcohol based, oil based, or glycerin based.
Frequently asked questions
How many mg of THC is in one drop of tincture?
It depends entirely on bottle strength. A 30 mL bottle with 600 mg THC holds 20 mg per mL, so one drop of a 20 drop per mL dropper is about 1 mg.
Does a tincture work faster than an edible?
Held under the tongue, a tincture can take effect in 15 to 45 minutes. Swallowed tincture behaves like an edible and can take 60 to 120 minutes.
Can I use the same calculator for CBD tinctures?
Yes. Swap the THC number for the CBD number and the math is identical.
Is a tincture dosing calculator a substitute for medical advice?
No. It is a measurement tool. Speak with a pharmacist or physician before starting THC, especially if you take blood thinners, sedatives, or liver-metabolized drugs.