How to compare CBD strength on a label

Write down two things from the same product variant: the amount explicitly labelled CBD and the liquid volume. A number beside ‘hemp oil’ or ‘hemp extract’ cannot automatically be counted as CBD. If a listing gives only an extract amount, leave the CBD field blank until the manufacturer clarifies it. Our hemp seed oil guide explains the ingredient distinction. Keep milligrams, which measure mass, separate from millilitres, which measure volume; they are not interchangeable units.

Cannaray’s Bright Days Oil page lists 500 mg CBD in 10 mL and 1,500 mg CBD in 30 mL. These are documented label examples, not product recommendations. [1] Divide each CBD total by its bottle volume: 500 ÷ 10 = 50 mg/mL, and 1,500 ÷ 30 = 50 mg/mL. The larger bottle has three times the labelled total CBD and three times the liquid. Its labelled concentration is the same. A larger front-label number alone would hide that equality.

For a hypothetical oil labelled 20 mg CBD per mL, a labelled serving of 0.25 mL would contain 20 × 0.25 = 5 mg CBD. If another bottle gives a serving of 0.5 mL at the same concentration, its serving would contain 10 mg. These examples explain the multiplication; neither amount is a recommendation. Copy the manufacturer’s serving volume accurately. Do not replace millilitres with an assumed number of drops or treat an unmarked dropper as a precise measuring instrument.

A percentage needs a stated basis. In a hypothetical 5% mass-per-volume declaration, 5 g per 100 mL converts to 5,000 mg per 100 mL, or 50 mg/mL. A mass-per-mass percentage instead refers to grams of product, so converting it to milligrams per millilitre requires more information. If the basis is missing, ask for CBD in mg/mL. That avoids quietly treating the weight of an oil as its liquid volume. There is no need to estimate a percentage when the label already gives clear CBD milligrams and millilitres.

Correct arithmetic can still begin with an inaccurate label. An FSA-commissioned survey of 100 products purchased in 2022–23 found 49 matching CBD claims, eight above and 43 below. This selected England-and-Wales sample describes that survey, rather than the current worldwide market. [2] Save the exact product variant, bottle size and batch number with your calculation. Then compare the matching laboratory report using compatible units, following our COA reading guide. If the product page, label and report disagree, ask the seller to resolve the discrepancy before relying on a strength comparison.