How to read milligrams: total CBD vs CBD per mL vs CBD per dose

A CBD label has at least three numbers on it, all expressed in milligrams. They are not the same number, and confusing them is the most common reason a customer thinks they got the wrong dose. This article explains the three numbers, the math that links them, and how to verify the math against a Certificate of Analysis (COA).

The three numbers

Total CBD per package. The largest number. This is the total milligrams of CBD in the entire bottle, jar, or container. A 1000 mg label means 1000 mg total CBD distributed across however many millilitres or capsules are in the package.

CBD per mL (tincture) or per capsule (capsule) or per gram (topical). The unit-level number. This is total CBD divided by the number of units in the package. A 1000 mg / 30 mL tincture is ~33 mg per mL. A 1500 mg / 30-capsule bottle is 50 mg per capsule. A 600 mg / 30 g balm is 20 mg per gram.

CBD per dose. The applied number. This is what ends up in your body or on your skin per use, and it depends on the dose you take, not just on the per-unit number. Half a dropper (0.5 mL) of a 33 mg/mL tincture is ~17 mg of CBD per dose. Two capsules of a 50 mg cap is 100 mg per dose. A finger-tip of a 20 mg/g balm is roughly 4–10 mg per application, depending on how much you use.

The math that links them

The relationship between the three numbers is plain arithmetic.

Per-unit math (tincture): Total CBD ÷ Bottle volume = CBD per mL.
1000 mg ÷ 30 mL = 33.3 mg/mL.

Per-unit math (capsule): Total CBD ÷ Number of capsules = CBD per capsule.
1500 mg ÷ 30 capsules = 50 mg per capsule.

Per-unit math (topical): Total CBD ÷ Container mass in grams = CBD per gram.
600 mg ÷ 30 g = 20 mg per gram.

Per-dose math: CBD per unit × Number of units in your dose = CBD per dose.
33.3 mg/mL × 0.5 mL (half-dropper) = 16.7 mg per half-dropper dose.
50 mg/capsule × 1 capsule = 50 mg per capsule dose.
20 mg/gram × 0.3 g (pea-size application) = 6 mg per application.

If a label states the total per package and the per-unit number, you can sanity-check by dividing the first by the package size and seeing whether you get the second. If they do not match, the label has a typo, the package was filled to a different volume than labelled, or one of the numbers is rounded — and at that point the COA is the document to consult.

What the COA confirms

The label states the target concentration. The COA reports the measured concentration. For a well-controlled production process the numbers should be close, but they are not always identical to the millimetre.

The HPLC potency table on the COA shows the actual cannabinoid content of the lot, in mg/g (for solid products) or mg/mL (for tinctures), with a measurement uncertainty (typically ±5–10%). Multiply mg/g by the package mass, or mg/mL by the package volume, and you get the lot’s actual total CBD content. That number should match the label within the COA’s stated uncertainty range.

For tinctures, this means: a 1000 mg / 30 mL bottle whose COA reports 32.5 mg/mL has a lot total of 32.5 × 30 = 975 mg, which is within the typical ±5% uncertainty of the labelled 1000 mg. That is a normally-controlled lot. A COA reporting 25 mg/mL on the same label (750 mg total, 25% under-label) is a quality issue and should be flagged with the seller.

Total THC: the same math, different stakes

Canadian law caps the total THC in a finished consumer CBD product at 1000 mg per package. The same arithmetic applies — total THC ÷ package volume = THC per mL — and the per-mL number on a full-spectrum CBD tincture is typically a fraction of a milligram. The COA reports the measured value.

The customer-facing implication: a full-spectrum CBD tincture is not THC-free. It contains trace THC by design (that is what “full-spectrum” means in this context). The COA states the exact amount. If the customer needs zero detectable THC, the appropriate product is an isolate or a broad-spectrum tincture whose COA reports THC as below LOD.

The shorthand we use on Honest Botanicals product pages

Every Honest Botanicals product page lists the three numbers in this order:

1. Total CBD per package, in mg.
2. Per-unit concentration (per mL for tinctures, per capsule for capsules, per gram for topicals).
3. Other cannabinoids per package, in mg, where present.
4. The producer’s federal licence number.
5. A link to the lot’s COA.

If a number on the page does not match the COA, that is a discrepancy and we want to know about it. Email hello@honestbotanicals.co with the lot number on the bottle.