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How to calculate CBD content

How to calculate CBD content

If you’re new to CBD, one of your first questions will be about dosage. How much should you take, and how do you calculate that? We’re going to dive into that today.

How much CBD do you need?

It’s important to remember that there’s no universal CBD dosage. Everyone is different, and the right dosage will depend on many different factors, including body mass, CBD tolerance, genetics, the issue you’re treating, and so on. 

The other important factors to consider are the type of product you’re using and its concentration of CBD. Different products will interact differently with the body.

With all this in mind, it’s important to do your research so you can make an educated guess as to what your appropriate dosage will be. 

It’s generally advised to start out with the minimal suggested CBD dosage on your chosen product. You can then gradually increase your dose (slowly!) until you get the result you want. Some sources suggest building up your dosage by 25 mg every 3–4 weeks until you achieve relief from your symptoms. If your symptoms worsen or you have side effects, reduce your dosage.

It’s a good idea to record your daily intake and the effects so you can figure out what works and what doesn’t.

Understanding the concentration of your CBD product

The concentration is the total amount of CBD in your product—that is, how strong it is. Usually, this is shown on the label in milligrams (mg). Concentration is different from dosage, which will be stated as the amount of CBD per serving.

For example: if the label on a 30mL bottle of CBD tincture says it contains 1500 mg CBD and the serving size is 1ml, that doesn’t mean you get 1500mg in each serving! Instead, each 1ml serving will contain about 50 mg of CBD.

Here’s a general rule of thumb for estimating your dosage in milligrams of pure CBD (not CBD oil).

  • Low strength: 1 mg CBD per 10 lb bodyweight (0.2 mg/kg)
  • Medium strength: 3 mg CBD per 10 lb bodyweight (1.0 mg/kg)
  • High strength: 6 mg CBD per 10 lb bodyweight (1.5 mg/kg)

We’ll then look at how much this equates to in CBD oil. 

This chart shows how to estimate doses by comparing the weights of pure CBD.

Doses of CBD by weight & strength (in mg)

Your weight (lbs)

Low strength

Medium strength

High strength

100 lbs




125 lbs




150 lbs




175 lbs




200 lbs




225 lbs




250 lbs




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How to calculate CBD content

Start by checking the label of your product. This should tell you the concentration of CBD per ml of oil. If not, you’ll have to do some calculations yourself. This formula makes it simple. Take into account: 

  • Bottle size (in ml)
  • Quantity of CBD in the bottle (300 mg, 600 mg, 1000 mg)

Now… let’s calculate!

CBD in milligrams ÷ bottle size in ml = CBD in milligrams per ml 

For example, let’s calculate the strength of a 30mL bottle of CBD oil bottle containing 600 mg CBD.

600 mg ÷ 30 ml = 20 mg/ml CBD 

Or… 20 mg CBD for every 1 ml of liquid.

You can then use the reference chart above to figure out the size of your dose. 

There are now many different forms of CBD available to choose from, including oils, tinctures, edibles, vapes, topical formulas and more. Each form will have a different concentration of CBD, so it’s important to know how to measure your dose. 

It can be tricky at first to understand the concentration of a CBD product from the information on the label. Sometimes it's not just as straightforward as the number of milligrams.

How to calculate strength of tincture

With a tincture, it works similarly. You’ll need to check the label of your product for two things: the volume of the product container and the number of milligrams in the entire container. 

Some products contain a measure of concentration as a percentage, which can be helpful. A label that states 2000mg is only a high concentration if it's in a 10 ml bottle; it’s not so high if it’s in a 100 ml bottle! The former has a strength of 20%, and the latter only 2%.

The other important factor is the size of your dropper. Most droppers hold exactly 1 ml of liquid. Fill the dropper by squeezing and drawing the CBD up into it. Then dispense one drop at a time, counting each drop as you go. One ml should equate to around 20 drops. 

Like with CBD oils, you’ll still want to start with a lower dose and gradually increase until you feel relief from your symptoms. If you feel negative effects, reduce your dose.

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