booker
Posted
Great advice on GLP and dieting in…
Great advice on GLP and dieting in general. Best GLP calculator on the net for choosing dose and beginner friendly and top tier
Response from Fat Scientist· Mar 15, 2026
Thank you Booker!

Excellent
129 reviews
Fat Scientist is a free online resource built for people using GLP-1 medications like tirzepatide (Mounjaro, Zepbound) and semaglutide (Ozempic, Wegovy). We specialize in tools and educational content for users of compounded versions of these medications, which come in multi-dose vials and require precise dosage calculations. Our suite of calculators helps users convert prescribed milligram doses into exact syringe units based on their specific vial concentration, calculate split doses for improved tolerability, estimate medication costs, and plan their treatment timelines. Every calculator is free, requires no account, and works on any device. We built Fat Scientist because compounded GLP-1 medications present a unique challenge. Unlike brand-name auto-injectors with pre-measured doses, compounded vials require users to do math that directly impacts their safety. A wrong calculation means injecting too much or too little medication. We believe nobody should have to guess when it comes to their health, and the tools to get it right should be accessible to everyone. Beyond calculators, Fat Scientist provides guides on topics like reading vial labels, understanding concentration values, proper injection technique, and navigating the differences between brand-name and compounded medications. Our FAQ library addresses the most common questions we see in GLP-1 communities, written in plain language without medical jargon. Fat Scientist is operated by Productist LLC. We are not a pharmacy, we do not sell medications, and we are not a substitute for medical advice. Our mission is purely informational — giving GLP-1 users the tools and knowledge to use their medications safely and confidently. We are funded by voluntary donations from our users, not advertising or affiliate deals, so our recommendations are never influenced by commercial interests. Whether you are just starting your GLP-1 journey or adjusting an existing regimen, Fat Scientist is here to help you get the nu
Fat Scientist (fatscientist.com) has 129 customer reviews on Consumer Courier, with an average rating of 5.0 out of 5.
129 approved reviews, newest moderated first
booker
Posted
Great advice on GLP and dieting in general. Best GLP calculator on the net for choosing dose and beginner friendly and top tier
Response from Fat Scientist· Mar 15, 2026
Thank you Booker!
Andrea M.
Posted
Super easy to use, and what a relief to have a simple platform to ensure I’m taking the correct amount. Showed it to my sister, and she loves it!
Response from Fat Scientist· Mar 15, 2026
Thanks Andrea! So glad to be of use, and thank you for spreading the word!
john H.
Posted
This was exactly what I needed for calculating my injection amounts. They're sites layout is perfect.
Response from Fat Scientist· Mar 15, 2026
Thanks John! We aim for clarity, simplicity, accuracy, and ease-of-use. So glad to be of help!
Rabyn F.
Posted
I use this EVERY week before I do my shot to double-check I'm drawing the right dose. It makes it so easy as I have titrated up AND used different pharmacies with different concentrations. Thank you so much for this amazing resource!
Response from Fat Scientist· Mar 15, 2026
Thank you Rabyn for the kind words! Very pleased to be of use to you on your GLP-1 journey...
Angelique B.
Posted
Helps me never mess up my dose! Been using it since I started my glp-1 journey and it's been a godsend!
Response from Fat Scientist· Mar 15, 2026
So glad to hear it Angelique! Good to have you in the Fat Scientist family.
Maria W.
Posted
I have been using Fat Scientist for over six months and absolutely love it. I trust and rely on it for my weekly GLP always accurate dosage!
Response from Fat Scientist· Mar 15, 2026
Thanks Maria! Appreciate the kind words and am so pleased Fat Scientist has been a useful tool for you all this time.
Ali
Posted
I am so grateful for this resource! When I started my tirz journey, I was doing a lot of math in my notebook. About a year ago, a friend recommend I try Fat Scientist to confirm my correct unit dosages with their dosage calculator. I have been using it every week since! I can't recommend them enough!
Response from Fat Scientist· Mar 15, 2026
Thanks Ali, and thanks Ali's friend! 🥰 So glad that Fat Scientist has been able to accompany you on your journey.
Nancy R.
Posted
Best tool to make sure my injections are done with the correct dosage since some pharmacies have different strengths. It also is great to have the split dose calculator too! Love the fat scientist!
Response from Fat Scientist· Mar 15, 2026
Thanks for the love and kind words, Nancy! So glad the split dose calculator has been useful for you.