Quick answer
There is no universal cannabis oil dosage chart. The numbers that matter are milligrams of THC per dose and milligrams of CBD per dose, not drops or dropperfuls. Most harm reduction guidance settles on the same starting point: 1 to 2.5 mg of THC for a first-timer, 2.5 to 5 mg for a low dose, and 10 mg as the reference serving in states that regulate edibles. Anything above 10 mg is a tolerance conversation, not a starter dose. CBD runs on its own scale and is usually started at 10 to 25 mg.
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Why one chart cannot cover every bottle
Two bottles the same size can hold wildly different concentrations. A 30 mL tincture might carry 150 mg of THC or 900 mg. A dropper of the first is a sip. A dropper of the second is a full evening. Reviews of cannabis dosing research point to this variability as the main reason blanket charts fail.
Read the bottle first
I look for three numbers before I look at any chart: total THC in the package, total volume in mL, and the serving size the maker suggests. If the label only says "strong" or "full spectrum" with no milligrams, put it back. You cannot dose what you cannot measure.
Starter ranges by experience
Use these as a frame, then adjust down if you are small, older, new to cannabis, or taking other medications. These are THC numbers per single dose.
- Never used cannabis: 1 to 2.5 mg THC. Wait a full two hours before judging it.
- Occasional user: 2.5 to 5 mg THC. This is the low-dose zone most people stay in for sleep or anxiety.
- Regular user with tolerance: 5 to 10 mg THC. The 10 mg mark is the standard regulated serving in California and several other states.
- Daily, high-tolerance user: 10 to 25 mg THC, and up. Tolerance climbs faster than most people expect, so a dose that worked in month one may feel flat by month six.
- CBD oil, no THC: 10 to 25 mg CBD as a starting point, moving up over days. Clinical studies often use far higher amounts under supervision.
Turning mg per mL into an actual dose
The math is short and worth doing once, on paper, before you open the bottle.
- Divide total THC in the bottle by total volume. A 30 mL bottle with 600 mg THC is 20 mg per mL.
- Decide your target dose in mg. Say 5 mg.
- Divide the target by the concentration. 5 divided by 20 is 0.25 mL.
- Draw that volume with the marked dropper, not by eye. If the dropper is unmarked, ask a pharmacist for a 1 mL oral syringe.
- If you are counting drops, a standard 1 mL dropper is about 20 drops, so each drop is 0.05 mL. That is 1 mg per drop in the 20 mg per mL example.
Convenience has pushed a lot of oil into pre-marked droppers and metered caps, which helps, but the label is still the deciding factor. A pretty dropper cannot fix a bottle with no milligram info.
Timing matters as much as the number
- Swallowed oil typically starts in 30 to 120 minutes. Hold it under the tongue and onset is faster, often 15 to 45 minutes.
- Peak effect for swallowed oil lands around 2 to 4 hours, with a tail out to 6 or 8 hours.
- Do not redose before two hours have passed. The most common bad night with oil is a second dose taken at 45 minutes because "nothing happened yet."
- Fat in the stomach changes absorption. The same dose after a heavy meal can hit softer and later than on an empty stomach.
When to slow down or check in with someone
Racing heart, panic, heavy limbs, and a sense of unreality are signs you overshot. Sit down, drink water, and give it time. These effects pass. Skip the oil entirely and talk to a clinician if you take blood thinners, liver medications, or seizure drugs, since CBD can interact with how those drugs are processed. Pregnant people and anyone under 21 should not use cannabis at all. Regulators also note that CBD products are lightly tested, so potency on the label may not match the bottle. That is one more reason to start low and keep a note of what you took.