CBD Dosing Calculator

cbd dose calculator

So you want to incorporate CBD into your lifestyle? Where do you start? The first step is to consult your doctor or pharmacist before initiating a CBD regimen. They can provide professional advice on which dosage form of CBD to implement whether that be CBD oil, capsules, tinctures, or gummies. Although CBD can come in these different forms they are not the same and should be treated as different products with unique characteristics. The specific formulation of CBD can vary between each individual as well as the dose. One important rule with CBD products is to pay attention to doses. It is similar to reading a food label when you check the amount of CBD in a gummy or millimeters of tincture used. Another way to know how much CBD to incorporate into your lifestyle is by using a CBD dosing calculator. 

Unlike prescription drugs, CBD does not have an FDA-recommended dosing regimen. The only FDA guidelines would be those of Epidiolex, an FDA-indicated cannabinoid-derived drug for severe forms of epilepsy. So otherwise there are no FDA guidelines for dosing of other CBD products (2). The general rule is to start at a low dose and increase the dose slowly as needed for your body. Dosing can vary based on therapeutic use, body height and weight, and formulation of CBD. Start at a lower dose of 20 mg and if needed, you can slowly increase the dose until you reach the desired effect (6). I emphasize the word slowly so that your body can adjust to the CBD. 

Another important point is to mention to your doctor or pharmacist if you are taking any other medications or herbal supplements. It is important to discuss because anything else you may be taking can result in a drug interaction which can affect the metabolism of the drug. CBD has been shown to affect the expression of a drug transporter on the cell membrane which can vary from drug to drug (1). This overall affects how much drug is left available in the body which can range from increased amounts to decreased amounts. So be aware of what you put into your body. This rule goes for herbal supplements, not just prescription medicine, as all these little things factor in when considering the CBD dosing calculator. 

After screening your current medicine cabinet, you can proceed to find a CBD formulation that works right for you. Ask yourself what you are looking for in a product. Something for overall wellness? Or a specific wellness goal? What kind of formulation? Capsules and gummies are oral formulations that have to pass through the GI tract before being absorbed. This can take a little longer for the onset of the effect but is convenient and easy to administer (5). Oils and tinctures are dosed with a dropper that you can place to be absorbed underneath your tongue for a quicker onset of action. Oils and tinctures may be a better option if you want to feel the effects as soon as possible for scenarios such as a desire for feelings of relaxation. Putting these formulations underneath the tongue bypasses the stomach and enters the circulation quicker to therefore experience the effect more rapidly. Placing underneath the tongue can elicit an effect as quick as 15 minutes compared to the capsules and gummies which would be around an hour (4). These are a few points to consider when selecting an appropriate CBD product for your lifestyle.

Nex,t where can you find a CBD product? Do your research! Ask your doctor or pharmacist if they have any recommendations. If not you can always do your research and find websites with trusted trusted reviews. Reading the reviews is a good way to check how different products work and if customers are satisfied with the results. Also not only should you pay attention to the website and the reviews, but focus on the ingredients and the dosage of the formulation. If you are looking for oils and tinctures different concentrations exist, some are stronger than others which may not be the best to start with. I would suggest starting with oils and tinctures of lower concentrations and following the recommended dosing on the bottle. This goes the same for capsules and gummies, pay attention to the dosage of CBD within them. Some may be larger doses which should not be used as starting doses so I would look for capsules and gummies of around 20 mg to start. If you are still confused about doses then really consider using a CBD dosing calculator. 

Do not be afraid to ask questions. If you have any questions about CBD you should not be afraid to ask your doctor or pharmacist, especially if you have any doubts. Another concern to address may be the possibility of side effects. CBD is generally well tolerated, however, studies have seen diarrhea, fatigue, and changes in appetite (4). However, these were also more commonly reported in cases where people took larger doses without gradually increasing the dose. So with this in mind, you can see why it is important to start at low doses and wait at least a week to increase the dose. Remember that although CBD can be acquired without a prescription, the dosing is still very critical to consider. Especially because CBD can alter the metabolism of other drugs, you must be careful with other medications or supplements you put into your body. 

The best thing you can do is to proactively implement CBD into your lifestyle which means you should conduct your research. This ensures that you will be familiar with formulations, dosing, and general properties of CBD to best support your journey to overall wellness. Not to mention you may come across some fun facts like how much CBD oil does one CBD plant produce? (Around a pound believe it or not) (3). So do your research, ask healthcare providers such as doctors and pharmacists any questions you may have, and read reviews from websites and stores that have CBD products to determine what is the best for you. CBD has become more popular so there are a lot of products out on the market, to navigate it can best be conquered with research and professional recommendations and advice. 

This article was written by Dr. Peace Lily Scientific Communications Intern, Caroline Cassol, and edited by Dr. Najifa Choudhury, PharmD.


  1. Alsherbiny MA, Li CG. Medicinal Cannabis—Potential Drug Interactions. Medicines. 2019; 6(1):3. https://doi.org/10.3390/medicines6010003. Published December 23, 2018. Accessed January 9, 2023.
  2. Caporuscio J, ed. CBD dosage: Benefits, safety, and side effects. Medical News Today. https://www.medicalnewstoday.com/articles/327518. Published January 17, 2020. Accessed January 9, 2023.
  3. How much CBD is produced per acre of hemp? Vida Optima™. https://vidaoptimacbd.com/blogs/cannabis-encyclopedia/how-much-cbd-is-produced-per-acre-of-hemp#:~:text=In%20general%2C%20you%20can%20expect,product%20and%20the%20formula%20needed. Published July 6, 2021. Accessed January 9, 2023.
  4. Santos-Longhurst A. How much CBD should I take the first time? Healthline. https://www.healthline.com/health/how-much-cbd-should-i-take-the-first-time#factors. Published November 19, 2019. Accessed January 9, 2023.
  5. Silva L. CBD dosage: How much should you take? Forbes. https://www.forbes.com/health/body/cbd-dosage/. Published December 20, 2022. Accessed January 9, 2023.
  6. Smith A. CBD dosage: Tutorial for beginners. Discover Magazine. https://www.discovermagazine.com/health/cbd-dosage-tutorial-for-beginners. Published December 9, 2022. Accessed January 9, 2023. 



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