How do I calculate the mg of CBD in an oil?

Multiply the capacity in ml by the % concentration and then by 10. Example: a 30 ml CBD 10 % oil contains 30 × 10 % × 1000 = 3,000 mg CBD.

What's the right price for CBD oil in France?

A price of between €2 and €4 for 100 mg of CBD is considered reasonable on the French market in 2025. Below €2/100 mg, value for money is excellent. Above €6/100 mg, the quality of sourcing and certificates of analysis (COA) should be checked.

What is the recommended daily dose of CBD?

There is no universal dose. Most clinical studies use doses of 20 to 300 mg/day, depending on the indication. For routine wellness use, we generally start at 10 to 25 mg/day and adjust according to the effects felt. Consult a physician for all therapeutic indications.

Is CBD legal in France?

Yes. Since the decree of December 30, 2021, cannabis flowers and leaves containing less than 0.3 % THC are authorized for sale in France. CBD oils, capsules and extracts are legal under this same THC threshold condition.

What's the difference between CBD full spectrum, broad spectrum and isolate?

Full spectrum contains all the cannabinoids naturally present in the plant, including traces of THC (< 0.3 %). Broad spectrum retains minor cannabinoids, but THC is eliminated. The isolate is 99 %+ pure CBD. Full spectrum benefits from the entourage effect, potentially more effective at equivalent doses.

How to read a CBD certificate of analysis (COA)?

A COA (Certificate of Analysis) issued by an independent laboratory must indicate: actual CBD content (in mg/ml or %), THC content (< 0.3 % legally required), absence of pesticides, heavy metals and residual solvents. Check that the analysis date corresponds to the product batch.

Free tool

CBD calculator: concentration, price and dosage

Q: How to read a CBD certificate of analysis (COA)?

A COA (Certificate of Analysis) issued by an independent laboratory must indicate: actual CBD content (in mg/ml or %), THC content (< 0.3 % legally required), absence of pesticides, heavy metals and residual solvents. Check that the analysis date corresponds to the product batch.

Compare the actual CBD milligram content of your products and their cost per milligram. Oils, flowers, capsules or extracts: a single tool to objectively evaluate any product on the French market.

Updated : June 2026 Free & no registration required Sources cited

Calculator

Product type

Capacity (ml)

ex : 10 ml, 30 ml

CBD concentration (%)

ex : 5 %, 10 %, 20 %

Price (€)

Price incl. VAT

Total CBD in product

—

Cost per 100 mg of CBD

—

€

Stock duration

—

days at 25 mg/d

Daily cost

—

€/day at 25 mg

Value for money

Product name B

Capacity (ml)

CBD concentration (%)

Price (€)

Calculations are based on data declared by the manufacturer. Actual content may vary from batch to batch. Always check the product's certificate of analysis (COA).

How to use this CBD calculator

The price on the packaging of a CBD oil says nothing about its real value. A €30 oil may contain twice as much CBD than one sold for €50. The only reliable indicator is the cost per 100 mg CBD.

Select product type Oil (in ml), flower or pollen (in grams), capsules (in units) or extract/crystals (in grams).

Enter contentment and concentration The concentration is indicated on the packaging (e.g.: 10 %, or 1,000 mg per 10 ml). For capsules, enter the number of units and the dose in mg per capsule.

Enter price The price you paid or found on the sales site, including VAT.

Read the results Total CBD in mg, cost per 100 mg, duration of stock at 25 mg/day and daily cost. Then use the comparison to evaluate two products side by side.

What formula does this tool use?

The calculation is simple and totally transparent:

Total CBD (mg) = capacity (ml or g) × concentration (%) × 10
Cost / 100 mg = price (€) ÷ total CBD (mg) × 100
Stock duration = CBD total (mg) ÷ 25 (daily reference dose)
Daily cost = price (€) ÷ stock duration

The daily reference dose of 25 mg is indicative. It corresponds to the lower range of doses used in clinical studies on the well-being effects of CBD. It does not constitute a medical prescription.

How to read the value for money?

Cost / 100 mg CBD	Evaluation	Comment
Less than €2	Excellent	Rare on the French market. Check the quality of sourcing.
2 € à 4 €	Good	Within the market average. Good value for money.
4 € à 6 €	High	Justified only by an organic label, a quality full spectrum or a documented premium brand.
Over €6	Very high	Always ask for the COA and compare before you buy.

Oil, flower, capsule or extract: what are the differences?

CBD Oil

The most widely used form in France. Taken sublingually (under the tongue) for rapid absorption, or added to food. Sublingual bioavailability is estimated at between 13 and 19 % depending on the study - higher than direct oral ingestion (6-10 %).

Flower and hash

Consumed as an infusion or vaporized. Vaporization offers the best bioavailability (34-46 % according to Huestis, 2007). CBD flowers are legal for sale in France if the THC content is less than 0.3 %.

Capsules

Practical for precise, reproducible dosing. Oral bioavailability is lowest (6-10 %), but effects are longer and more regular - interesting for daily use.

Extracts and crystals

Very high concentrations (60-99 % CBD). Cost per milligram is generally lowest. They require precise weighing (0.01 g scales) and are consumed diluted in oil or vaporized at low temperature.

Full spectrum, broad spectrum, isolate: what's the difference?

Full spectrum Contains all natural cannabinoids (CBD, CBG, CBC, CBN), terpenes, flavonoids and traces of THC (< 0.3 %). Benefits from'entourage effect documented by Russo (2011).
Broad spectrum Same profile, but THC is chromatographically removed. Recommended for people undergoing professional testing.
Isolat 99 %+ pure CBD. No entourage effects, maximum concentration per gram, generally lowest cost per mg.

CBD legal in France: what you need to know

Since the'order of December 30, 2021, cannabis flowers and leaves containing less than 0.3 % of THC are authorized for sale in France. CBD oils, capsules and extracts are legal under this same condition. All products sold legally must be accompanied by a certificate of analysis (COA) issued by an accredited laboratory.

Scientific and regulatory sources

Huestis, M.A. (2007). Human Cannabinoid Pharmacokinetics. Chemistry & Biodiversity, 4(8), 1770-1804.
Russo, E.B. (2011). Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects. British Journal of Pharmacology, 163(7), 1344-1364.
Grotenhermen, F. (2003). Pharmacokinetics and Pharmacodynamics of Cannabinoids. Clinical Pharmacokinetics.
ANSES (2022). Risk assessment of cannabidiol (CBD)-containing products. Collective expertise report.
Arrêté du 30 décembre 2021 relatif aux conditions d'utilisation de la plante Cannabis sativa L. - Légifrance.

Warning: The results of this calculator are provided for information and educational purposes only. They are based on data declared by the manufacturer and do not constitute medical advice. Newsweed cannot guarantee the accuracy of actual CBD levels, which may vary by batch and analysis methods. Consult a healthcare professional before using CBD for therapeutic purposes.