Start with 1 to 2.5 mg of THC, or 5 to 10 mg of CBD if your oil is CBD-dominant, and treat that first day as a measurement day rather than a test of your tolerance. Take it once, write down the time, and wait a full two hours before you decide it did nothing. That single rule prevents most of the bad nights people have with cannabis oil.
Oil is easy to get wrong because it looks like a food and acts like a drug. A dropper that holds a full milliliter can carry 20 mg of THC or 90 mg, depending on the bottle. The label is your only real guide, and the label is only useful if you read the whole thing.
Do the math on your bottle before you open it
Find two numbers on the package: total THC in milligrams, and total volume in milliliters. Divide the first by the second and you have milligrams per milliliter. A 30 ml bottle with 300 mg of THC works out to 10 mg per ml, so a half-milliliter dropper is 5 mg. That is a reasonable starting point for someone with no tolerance, or a light one.
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Some labels skip milligrams and print a percentage instead. The conversion is rough but close enough for planning: 1 ml of oil weighs about 0.9 to 1 gram, so a 10% THC oil lands near 90 to 100 mg per ml. That is a very strong bottle. Ten percent of a milliliter, a tiny bead of oil, is still around 9 mg.
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- mg per ml = total THC mg ÷ total ml
- dose = volume drawn × mg per ml
- percent THC × 10 ≈ mg per ml
Swallowed oil and held oil are not the same dose
Oil dropped under the tongue and held there absorbs through the mouth and hits in 15 to 45 minutes. Oil swallowed and digested takes longer, often 1 to 2 hours, and sometimes closer to 3 if you have just eaten a heavy meal. The same number of milligrams can feel like two different doses depending on the route.
Pick one method and stay with it while you calibrate. Switching back and forth makes your notes useless.
Why two hours, not twenty minutes
The most common mistake I see is topping up at the 30-minute mark because nothing happened. Nothing happened because digestion is still working. That second dropper stacks on top of the first and lands all at once, which is how people end up anxious, dizzy, and swearing off oil forever. If you feel nothing at two hours, you can take another small measured amount. If you feel too much, sit it out. Time is the antidote.
Titration: how to move up without overshooting
Once you know how a dose feels, increase by 1 to 2.5 mg of THC every two to four days, not every day. Small steps add up quickly, and THC tolerance builds slower than most people expect. If you are using a balanced oil with roughly equal CBD and THC, hold the CBD steady while you adjust the THC side, since CBD can soften some of the sharper edges.
- Pick a starting dose and a fixed time of day.
- Log dose, route, time, and how you felt at 1, 2, and 4 hours.
- Hold that dose for two to three days before changing anything.
- Increase in 1 to 2.5 mg steps until you reach the effect you want, then stop.
What actually changes your dose
Body weight matters less than most people assume. Metabolism, prior cannabis use, liver enzyme activity, and whether you ate fat with the oil all shift the response more. CBD oils carry their own variable: a bottle that says 1000 mg on the front may be 30 ml or 100 ml, and those are very different concentrations. Always check the back panel.
The convenience question
Pre-marked droppers and calibrated oral syringes have made oil dosing far less messy than it used to be, and that convenience is genuinely useful because it removes the guesswork. But convenience is not accuracy unless you check the marks. A dropper with a single line at 1 ml cannot give you 2.5 mg of a 10 mg per ml oil. A 1 ml syringe with 0.1 ml graduations can. Buy a pack of those for a couple of dollars and keep one with the bottle.
The printed serving size is also not your serving size. It is a regulatory default, and it can be two to four times what a new user should take.
Red flags worth respecting
Chest tightness, a racing heart, panic, repeated vomiting, or difficulty staying awake are reasons to stop and get help, especially on a first attempt. CBD is not inert either. It can interact with blood thinners and with medications processed through certain liver enzymes, so if you take prescription drugs, ask a pharmacist before you start. Keep the bottle out of reach of kids and pets. Oil looks like candy to a dog, and it is not.