Which Probiotic Gives You More for Your Money?
Compare probiotics by what they cost per billion CFU, not just the big number on the front.
This tool was built by Serge (MSc) using established science and government sources. My academic background covers plant biology, environmental biology, and biogeochemistry. My tools are for educational purposes and give practical guidance, not professional advice.
Probiotic labels lead with a big CFU number, but the question for value is what each billion CFU costs you. This calculator works that out.
Enter the price, the CFU per serving in billions, and the servings per container, then run it again for another product to compare.
Two divisions, one number
Cost per serving = price ÷ servings
Cost per billion CFU = cost per serving ÷ CFU in billions
A container priced at 30 with 30 servings costs 1 per serving. If each serving has 50 billion CFU, that is 1 ÷ 50, or about 0.02 per billion CFU.
Run two products this way and you can see which gives more live cultures for the money.
A value figure, not a health verdict
A lower cost per billion CFU means more live cultures for your money, which helps when comparing similar products. It says nothing about whether a product will do anything for you.
Use it to spot when a product with a smaller headline number is the better deal per CFU, or when a very high count comes at a steep price.
Why more CFU is not always better
The NIH Office of Dietary Supplements states that higher CFU counts alone do not necessarily mean greater health benefits. The benefit, if any, depends on both the specific strains and the number of CFUs.
The label number can also mislead. Some products list CFU at the time of manufacture and others through the expiration date, and counts can fall over time. Some experts suggest choosing products that state the count through the expiration date, and following the storage instructions, since some probiotics need the refrigerator.
Compare like with like
This tool compares cost and CFU only, not quality or strains. Compare products with similar strains and the same CFU basis, whether at manufacture or through expiry.
For the plain cost of each serving, the Cost Per Dose Calculator gives the figure, and the Bottle Duration Calculator shows how long a container lasts and when to reorder.
Who should ask first
Most probiotics have been used safely for decades, but they might not be safe for everyone. The FDA has reported they might cause infections in preterm infants, and they might cause problems in people who are seriously ill or have weak immune systems.
There are no official recommendations for healthy people, so ask a health care provider which product, dose, and length of use suits you.
Where this comes from
The meaning of CFU and the caveat about higher counts come from the NIH Office of Dietary Supplements probiotics fact sheet for consumers.
For the full scientific review, see the fact sheet for health professionals.
This calculator is for general education only and is not medical or professional advice. Always check product labels and speak with a qualified professional before making decisions about supplements.