Fat Scientist (fatscientist.com) has a 5.0 out of 5 rating on OK.one, based on 62 user reviews collected here. It is listed under Public & Local Services and its reputation is excellent. Praise is nearly unanimous, with 100% rating it 4 stars or higher. Last updated 2026-08-10.
Easy to use. SUPER HELPFUL. An absolute life saver. If you are taking a glp1 this is a MUST USE TOOL to double check you are taking the correct dose. I just started a split dose, thankfully I use fatscientist.com and bam, math done for me!
Thanks so much, Stacy! Glad to hear that Fat Scientist and the split dose calculator has been useful for you!
This site has been so helpful in my weight loss journey with my tirzepitide dose. I can easily calculate what dose to take based on the concentration of my meds. This website is the go to for myself and a lot of my friends who use weight loss or diabetes shots.
Thanks Ellen! So pleased that Fat Scientist has been a useful tool for you, and appreciate the kind words.
Finally.. an easy button to understand things my brain can’t comprehend. Literally the easiest to understand!!
Thank you! There are other calcs out there but we've worked hard to make Fat Scientist as intuitive and user-friendly as possible -- so this feedback means a lot. Appreciate it!
The most helpful information at one's fingertips for understanding and calculating injection dosage! Thank you!!
Thanks Barb! So glad Fat Scientist could be of help!
This tool was critical to understand dosing. I use this every single time I have a new vial. It is not only educational, it is VITAL for patient safety. This can be confusing and fat scientist has helped me so much in understanding dosing and safety.
Thank you Justine, appreciate this so much. At the end of the day, Fat Scientist is all about education and safety, so you've hit the nail on the head.
This is one of the best tools I’ve used in my glp-1 journey! I always check the calculators before I take a shot, so I don’t make a mistake. I have peace of mind every shot day - thank you Fat Scientist!
Thank you Sarah! Believe it or not, I use my own site before every shot as well, just to be sure! Appreciate you.
When I started Tirzepatide I went through a very expensive doc in the box who wrote scripts…that’s it. He didn’t explain things and would take days to reply to a question…I was on my own and knew nothing! Somehow I stumbled across Fat Scientist…had I not, I would have given up before I started. Fat Scientist quickly became my professor, doctor, nurse, pharmacist and supportive friend all rolled into one. Thank you, Fat Scientist, you have been more than life changing!
Thanks Tex! Fat Scientist is *not* a substitute for guidance from a qualified medical professional, but hopefully can fill in some of the gaps that some providers (unfortunately) leave, and help educate people about some of the key concepts. So glad we could help you!
Fat Scientist is so informative. It’s easy to use, and been a lifesaver when changing dosages. Love this site.
Thanks CJ! Really glad Fat Scientist has been a helpful companion, especially when navigating dose changes.
Thanks Morgan! We aim for clarity, simplicity, accuracy, and ease-of-use. So glad to be of help!
Calculator was very easy to use - I've continued to check on Fat Scientist every time I increase my dose or when I have to split a dose between vials. Practically dummy proof.
Thanks Kate! "Dummy proof" is exactly what we're going for — glad Fat Scientist has been a reliable companion every step of the way, including those tricky split-dose situations!
I’d probably be in bad shape with my dosing if it wasn’t for this app. I use it every time to check my dosage before I do the jab.
Thanks so much for the kind words. Glad we could help!
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!
Thanks for the love and kind words, Nancy! So glad the split dose calculator has been useful for you.
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!
Thanks Ali, and thanks Ali's friend! 🥰 So glad that Fat Scientist has been able to accompany you on your journey.
Helps me never mess up my dose! Been using it since I started my glp-1 journey and it's been a godsend!
So glad to hear it Angelique! Good to have you in the Fat Scientist family.
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!
Thank you Rabyn for the kind words! Very pleased to be of use to you on your GLP-1 journey...
This was exactly what I needed for calculating my injection amounts. They're sites layout is perfect.
Thanks John! We aim for clarity, simplicity, accuracy, and ease-of-use. So glad to be of help!
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!
Thanks Andrea! So glad to be of use, and thank you for spreading the word!
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!
Thanks Maria! Appreciate the kind words and am so pleased Fat Scientist has been a useful tool for you all this time.
Great advice on GLP and dieting in general. Best GLP calculator on the net for choosing dose and beginner friendly and top tier
Thank you Booker!
I look at Fat Scientist each week for my dosing even when I already know it. I just like to make sure :-) and I trust them and have been enjoying their service for 8 months now!
Thanks Sarah! So glad that Fat Scientist has been an aid to you!
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