# How to calculate the amount of CBD in an Oil.

We are going to start **from the base**, in order **to understand** how CBD is mixed with oil to obtain CBD Oil.

From the dried plants a vegetal extraction is obtained, called resin or paste. This paste can be obtained by numerous procedures and one of them is** extraction with alcohols**. But not normal alcohols, they are special for extractions since they do not have additives to be detected by taste, as normal alcohols from the pharmacy have.

## Concentration in percentage of CBD.

The extraction or paste, the result of the extraction process of hemp or marijuana plants, is sent for analysis to laboratories with certain references in **the world of cannabinoids**. This paste will have a different percentage for the most sought-after cannabinoids. If, for example, a paste gives us** 40% CBD and 4% THC**, it is already limiting us to the maximum percentage of CBD that we must have in the oil. **According to the legislation** in force in each country, the paste will have to be diluted until reaching the limit values of THC concentration. In Spain 0.2%. In this practical case, the paste should be diluted 20 times, leaving a quantity of CBD of 2%.

The easiest way to proceed is by **using the percentage conversion to g/ml**. In order not to have to dilute the paste and then not be sure if it has been diluted well, or have to analyze it (which must be analyzed for traceability and good uses), we use the formula of the concentration of **solid in liquid** which equals the percentage of a solid into a** liquid using the following formula**. % = (g/ml)*100.

This formula has given you the number of grams of** pure CBD** that you have used in the dilution. We continue with the practical example.

## Concentration per g/ml of CBD Oil.

If our paste has given 40% purity in CBD, it means that for every gram only 40% is pure CBD. So in the concentration formula we must take this into account. Since the formula includes the grams of pure solids, in order to obtain the concentration of that solid in the total amount of milliliters of solvent, in this case the oil.

In our practical case, as we know that we must reach a maximum of 2% of CBD, so we do the following calculations: 2%=(grams/ml)*100. Knowing that we are going to dilute in a 10 ml bottle, then we would clear the amount of pure CBD grams remaining: grams= 2%*ml/100 resulting in 0.2 grams of pure CBD to be used in the mixture. Pure CBD eye, but since we have it pure we must mix the corresponding amount of paste that we already know is 40% CBD.

Now it is calculated with a rule of thumb… if there are 0.40 grams of pure CBD in one gram of paste, and we need to have 0.2 pure grams of CBD in each bottle… how many grams of my paste will I need? put in each bottle to have 0.2 grams of pure CBD in each bottle?.

**Result => 0.2 pure grams * 1 gram of paste / 0.4 grams of pure CBD = 0.5 grams of paste from the extraction obtained at 40% will be necessary to obtain 0.2 grams of pure CBD.**

Another dirty game of some brands is to say that they have put “X” milligrams in the bottle but they refer to the raw pasta. In this way it should **indicate the percentage of the paste**, if not, there is no way to calculate the concentration.

**In short, they should always give you either the percentage, or the mg of pure cbd and the size of the bottle.**