Fat Scientist is an absolute must for anyone using a GLP-1! What a treasure trove of FAQ's and calculators in plain common laymen terminology. I'm now confident in what I'm doing and highly recomme... Toon meer
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This is such a helpful resource for anyone starting out on the GLP-1 journey, and it's just as much a necessary tool for more seasoned patients too! I think I've double checked myself w/ FatScientist... Toon meer
Bedrijf heeft geantwoord
When I switched to compounded meds, I didn't understand the difference between volume, concentration, dose or about how to figure out my dose. Some knowledgable users directed me toward Fat Scientist... Toon meer
Bedrijf heeft geantwoord
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 noth... Toon meer
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Bedrijfsgegevens
Geschreven door het bedrijf
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 numbers right.
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- fatscientist.com
4,9
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131 reviews
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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
19 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thank you Booker!
Super easy to use
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!
3 september 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Andrea! So glad to be of use, and thank you for spreading the word!
This was exactly what I needed for…
This was exactly what I needed for calculating my injection amounts. They're sites layout is perfect.
12 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks John! We aim for clarity, simplicity, accuracy, and ease-of-use. So glad to be of help!
I use this EVERY week!
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!
8 maart 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thank you Rabyn for the kind words! Very pleased to be of use to you on your GLP-1 journey...
Helps me never mess up my dose
Helps me never mess up my dose! Been using it since I started my glp-1 journey and it's been a godsend!
1 januari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
So glad to hear it Angelique! Good to have you in the Fat Scientist family.
I have been using Fat Scientist for over 6 months…
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!
22 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Maria! Appreciate the kind words and am so pleased Fat Scientist has been a useful tool for you all this time.
I am so grateful for this resource
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!
20 maart 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Ali, and thanks Ali's friend! 🥰 So glad that Fat Scientist has been able to accompany you on your journey.
Best Tool Ever!
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!
22 maart 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks for the love and kind words, Nancy! So glad the split dose calculator has been useful for you.
Indispensable
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.
9 december 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks so much for the kind words. Glad we could help!
Perfect for the Math-Challenged
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.
4 oktober 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
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!
Antwoord van Fat Scientist
Thanks Morgan! We aim for clarity, simplicity, accuracy, and ease-of-use. So glad to be of help!
Fat Scientist is so informative
Fat Scientist is so informative. It’s easy to use, and been a lifesaver when changing dosages. Love this site.
12 augustus 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks CJ! Really glad Fat Scientist has been a helpful companion, especially when navigating dose changes.
I use fat scientist weekly and rely on…
I use fat scientist weekly and rely on it heavily! Absolutely no complaints and would recommend fat scientist to any friends and family.
12 december 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Zack! Really appreciate you spreading the word to friends and family — that means a lot to us.
The dose calculator is a game changer…
The dose calculator is a game changer when figuring out/checking my tirzepatide dose. It has given me peace of mind and saved me so much time and math.
3 januari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Lauren! Peace of mind on shot day is exactly what we're going for. So glad Fat Scientist has been able to save you the mental math!
So helpful!
This site is the best! It’s so nice to double check your dosage when titrating up or down or just to have a comfort level that you’re doing it correctly.
13 november 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Jamie! That peace of mind when titrating — knowing you've got the right number — is exactly what Fat Scientist is here for.
Simple and Easy!
Simple, easy-to-use calculator that has evolved with feedback from users and is now a great all-around resource for both newbies and experienced GLP users. Thank you, Ted!!
22 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thank you! Love hearing that it works for both newcomers and veterans alike — and yes, user feedback has genuinely shaped a lot of what the site has become.
Awesome website to help with all kinds…
Awesome website to help with all kinds of GLP dosing. My go to place to figure out anything related to dose management.
6 september 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Lawrence! Really glad Fat Scientist has become your go-to for dose management — that's exactly the role we're hoping to fill.
Excellent medication safety check!
Very helpful when i need to adjust my medication dose and double check my calculations. I never skip this as a safety check. Its so quick and easy to use.
17 januari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Kim! Really glad Fat Scientist has become a reliable part of your routine.
Still using it a year later
I've been on compounded Tirzepatide for over a year and still double check my dose every week with Fat Scientist. It's a wonderful resource for learning how to read and understand your vials and dosage.
22 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Addie! So glad Fat Scientist has become a reliable part of your routine.
I saw this app discussed in my tirz sub…
I saw this app discussed in my tirz sub and used it for the first time this morning. I received new vials yesterday and wanted to dose at a smaller dose for my first dose of Tirz without B6. Highly recommend
22 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Jacki! Really glad the tirz community led you here — welcome, and hope Fat Scientist continues to be a useful companion on your journey!
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