CBD Lab Results Calculator

Written by 
Zora Degrandpre, MS, ND.
|Last Updated:

Lab Results Calculator

Total CBD AmountAs listed on product’s label

CBD Amount - Lab ResultsInsert the amount of CBD as listed in the lab results
Total CBD Amount Found (ex.504) or CBD mg/ml (ex.16.8)

CBD VarianceThe percentage of difference between the label and the lab results
Leafreport’s Rank
A = Less than 10% varianceB = Variance 10%-20%
C = Variance of 20%-30%F = Variance more than 30%

How to use the CBD lab results calculator

The lab results calculator measures the accuracy of a CBD product to see if you’re getting as much CBD as you paid for.

First, enter the product’s total amount of CBD in milligrams (mg). This amount is listed on the product’s label.  Then, enter the amount of CBD listed on the product’s third-party lab test results (total or mg per ml, according to what you found in the lab results). If the test result only shows mg/ml, you also need to enter the bottle size in ml.

The calculator will then show you the percentage of the difference between the label and the actual amount of CBD in the product. If it’s less than 10%, the product will get the best A ranking and pass the test. Between 10-20% the product will get a B score, between 20-30$ a C score, and above 30% = F score.

How to find total CBD amount with test results

A third-party cannabinoid profile/potency test document will typically have columns listing the name of individual cannabinoids (like CBD and delta-9 THC) and their amounts.

These amounts can be listed in milligrams (mg) per gram (g) of product, mg per milliliter (ml), mg per unit (bottle, gummy, etc.), or a percentage (%) of the total mass. Some documents will also separately list the total amount of CBD in a product.

Here’s how you can use this information to find the total amount of CBD in a product.

In the above screenshot, we can see that there is 411.6 mg of CBD per unit (in this case, a bottle of CBD oil), which makes things easy.

In some cases, the test won’t provide the total amount and will only list the mg/g, mg/ml, or percentage amount. In that case, you need to do some simple calculations to get the total amount of CBD.

If mg/ml is shown, then multiply it by the total product volume (e.g. 30 ml).

If it’s listed as a percentage, you can multiply the total volume by the percentage and then multiply again by 1000 to convert it into milligrams. For example, a 30 ml tincture with 5% CBD would equal (30*0.05)*1000=1500 mg of CBD.

Finally, for mg/g, you can multiply the amount by volume (for oil) or weight of the product (for gummies, capsules, and similar products). If it’s a CBD oil, you can multiply the mg/g by the volume and then multiply again by 0.92 to convert from grams to milliliters. For example, if you had a test showing 40 mg/g for a 30 ml oil, you’d get (40*30)*0.92=1104 mg of CBD in total.

Learn more about COA and how to read it
What is a CBD Certificate Of Analysis (COA) and why is it important

How to read a CBD Certificate of Analysis (COA)

CBD Lab Results FAQ

  • What is CBD?
    CBD is a phytochemical found within the cannabis plant. CBD is short for cannabidiol, one of the two most plentiful cannabinoids found in cannabis, the other being THC. CBD interacts with the endocannabinoid system found in all animals and fish, including humans.
  • Is CBD safe?
    CBD is found to be generally safe. There have been no deaths attributed to ingestion of the cannabis plant, including CBD. The FDA has approved one CBD based drug called Epidiolex used for epileptic seizure reduction. The FDA reports that CBD can cause liver injury and interact with other medications. There have been reports of liver injury in humans who have taken CBD even at high doses. Side effects of taking CBD may include drowsiness, diarrhea, loss of appetite, and change in mood. There is more research needed around the safety and efficacy of CBD. Consult your health care provider before taking CBD to ensure it is right for you.
  • What can CBD help with?
    The National Institute on Drug Abuse (NIDA) states CBD has been shown to reduce stress in animals including rats. Other studies show that participants with social anxiety disorder (SAD) experienced overall reduction in anxiety levels after taking CBD. CBD is also known to help with PTSD symptoms including replaying negative memories and enduring nightmares. People with anxiety may have lower levels of anandamide. Introducing CBD can help decrease the reuptake of anandamide and cause it to hang around longer which could decrease anxiety symptoms. CBD is also thought to stimulate serotonin receptors. Serotonin is a neurotransmitter that plays an important role in mental health. Having insufficient serotonin can also contribute to anxiety. This study found a significant decrease in insomnia symptoms for participants taking CBD and other cannabinoids. Research also shows that CBD inhibits inflammatory molecules in the body that contribute to pain. The Arthritis Foundation states CBD appears fairly safe and might help certain types of pain.
  • What is COA or Certificate of Analysis?
    The COA refers to a test report that provides information about the product. It is typically done by a third part lab to avoid any potential bias in the reported findings. Lab values such as percentages of CBD, THC, and other cannabinoids found will be on the report. Percentages of other phytochemicals like terpenes and flavonoids may be reported as well. Other tests that may be found on the COA include toxins, microbes and solvent levels found in the product. Reviewing the COA before purchasing a CBD product is always a good idea so that you know exactly what you are getting. You can learn more about a CBD Certificate of Analysis (COA) here.
  • Where can I find lab results or the COA?
    The brand’s website will often have the COA reports for their products available at the click of a button. Other brands will provide a QR code on the product label that you can scan and be taken directly to the COA. Some companies only provide a COA on demand and do not publish them for public viewing.
  • What does it mean if my product has a variance of over?
    If a product has over 10% variance, this means the actual amount of CBD in the product was plus or minus 10% of the CBD amount stated on the COA. If this occurs, Leafreport does not give a passing score in this category for the product, as the report and/or labeling for the product is inaccurate.

    About The Authors
    Dr. Zora DeGrandpre practices naturopathic medicine (home visits) in rural Washington and is a professional medical and scientific writer and editor, specializing in naturopathic, functional, botanical and integrative medicine. Dr. DeGrandpre has degrees in drug design, immunology and natural medicine and has extensive research experience in cancer and molecular immunology. In her practice, Dr DeGrandpre has found the use of CBD with elderly patients and others to be safe and clinically effective. She brings to all her writing a straightforward approach that is accurate, clear and authentic.
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