Blog header: How to calculate your CBD dose
CBD Information, CBD Oil, Rational

How to Calculate Your CBD Dosage

If you’re new to CBD one question you may have is “How do I calculate my CBD dosage?” It’s a common question and, unfortunately, there’s not one right answer. Why? There are many variables that can affect your dosage needs:

  • Your weight
  • Your unique body chemistry
  • Your individual body’s response to CBD
  • How you are taking the CBD (sublingual, oral, etc.)
  • The brand, strength, and type of CBD


Most people find that 20 to 40mg of CBD per day is a good starting dose. With Rational Hemp’s 30ml, 2400mg of CBD oil bottles, that’s between one-quarter and one-half of a dropper. You may find that this is the perfect dosage for you, but keep in mind that many people fall outside the “norm” and need dosages that are higher or lower than average.

We generally recommend starting low and working your way up or down in dosage as needed. Keep in mind that CBD has a cumulative effect in the body, so consistent daily use as part of a regular wellness routine is key.

Want to learn more about how to take CBD? Read our article, How to Take CBD: Tips on Efficiency & Effectiveness.


You don’t have to suffer from any kind of ailment to benefit from CBD. In fact, many of Rational Hemp’s customers report that even though they didn’t have a particular “issue” before taking CBD, after integrating it into their daily wellness routine, they felt more balanced, refreshed, and energized.

If you do have a specific ailment or condition and are wondering how that might impact your dosage needs, the answer is that there is no one right answer. While some crowdsourced information is available on what others say worked for them, the truth is that our bodies respond to CBD differently. You will likely also find that your dosage needs will vary over time, so don’t be afraid to adjust if you feel you need more or less.

If you want a baseline to start from, here is how you can calculate your dose of CBD by weight and strength of dosage desired:

CBD dose chart by weight

Using just weight and strength of dose desired, here is a chart with example starting dosages:

CBD dosage chart by weight and strength


If you want to go beyond our initial recommendation of starting with 20 to 40mg and get a little more specific, you can use the CBD oil dosage calculator below. This calculator estimates your dosage needs based on your weight, desired strength of dosage, the total CBD in the product you’re using, and the volume of the bottle.

Rational Hemp’s oil is pure and undiluted. Our 30ml bottles of CBD oil contain 2400mg of CBD and have 1ml droppers. Our half-size 15ml bottles contain 1200mg of CBD oil and have .75ml droppers.

Remember, the CBD oil dosage calculator above is meant only to provide an estimate of your dosage needs. There are many factors that cannot be included in a calculator but that will impact your dosage (such as your individual body chemistry and how your body responds to CBD). So, while it can be a useful tool for finding a starting point, do not hesitate to adjust your dosage if you feel you need more or less CBD.

Rational Hemp is regulatory-compliant and contains trace levels of THC under 0.3%.  While we know of no instance where a drug test came back positive after using our Hemp Extract, we cannot guarantee this result. Speak to a physician before using CBD if you are pregnant, nursing, or taking prescription medications. Statements made in the below article have not been evaluated or reviewed by the FDA.

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