About

Who runs this site

Free Protein Calculator is run by one person, not a company or a team. I am not a doctor, dietitian or nutrition scientist. I build websites, and I made this one because I wanted a protein calculator that shows where its numbers come from.

Because I am not a clinician, I do not give advice of my own. The calculator applies ranges published by sports-nutrition bodies, and the articles summarise published studies. Please read the medical disclaimer: this is general guidance, not personal medical advice.

Where the numbers come from

The calculator's ranges are taken from these published sources:

International Society of Sports Nutrition (ISSN) — position stand on protein and exercise, Jäger et al. (2017)
Academy of Nutrition and Dietetics, Dietitians of Canada and ACSM — joint position on nutrition and athletic performance, Thomas et al. (2016)
British Journal of Sports Medicine — meta-analysis of protein supplementation and resistance training, Morton et al. (2018)
PROT-AGE Study Group — recommendations for older people, Bauer et al. (2013)

The articles cite further studies at the bottom of each page. I check the references against PubMed, and I have found and corrected errors in some of them: here is what I found and how I checked. If you spot a wrong or missing citation, please tell me and I will fix it.

What the calculator does

Free — no signup, no premium tier, no ads
Runs in your browser — the figures you enter are not sent to a server or stored
An estimate — it factors in age, weight, activity, training days and goal, but it cannot know your health history

Get in touch

Questions, corrections and suggestions are welcome on the contact page. You can also browse the frequently asked questions or go straight to the protein calculator.