If you haven’t been using this, you should be. I love a no nonsense site that teaches me things. So useful, easy to use for different use cases, and educational. Really appreciate having this as an a... Zobacz więcej
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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... Zobacz więcej
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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... Zobacz więcej
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I have been on compounded GLP-1’s for almost 2 years. I love the flexibility of dosing. However, I always want to ensure I am injecting the proper amount. That’s where Fat Scientist comes in to the... Zobacz więcej
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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
If you haven’t been using this, you should be.
If you haven’t been using this, you should be. I love a no nonsense site that teaches me things. So useful, easy to use for different use cases, and educational. Really appreciate having this as an aid during my weight loss journey!!
24 września 2025
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks Winnie, appreciate the kind words.
Use info!
Offers several ways to understand reconstituting peptides in powder form.
8 kwietnia 2026
Opinia niezależna
The rating is really a 10+
4 kwietnia 2026
Opinia niezależna
Odpowiedź od Fat Scientist
You, sir, deserve 10 stars! Thank you for your support.
Amazing app
Amazing app. So helpful with the confusing dose info on the Tirz bottle. Love the split dose function. Perfect. Thank you so much
27 marca 2026
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks Deanne! So glad Fat Scientist could help clear up the confusing dose info -- and really pleased the split dose function has been useful for you!
I love this site
I love this site. Varying units can give you the mg and vice versa. Simple to use once set up for your product.
I keep coming back to this site when I vary dosages.
Thank you Fat Scientist for providing this.
23 marca 2026
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks Bonbon! That's exactly what we're going for -- simplicity and accuracy, however you need to slice it. So glad to be a reliable part of your routine!
Easy to use
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!
14 marca 2026
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks so much, Stacy! Glad to hear that Fat Scientist and the split dose calculator has been useful for you!
Such a helpful and incredible tool!!
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.
13 czerwca 2025
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks Ellen! So pleased that Fat Scientist has been a useful tool for you, and appreciate the kind words.
Finally.
Finally.. an easy button to understand things my brain can’t comprehend. Literally the easiest to understand!!
10 marca 2026
Opinia niezależna
Odpowiedź od Fat Scientist
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!!
The most helpful information at one's fingertips for understanding and calculating injection dosage! Thank you!!
28 lutego 2026
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks Barb! So glad Fat Scientist could be of help!
Critical tool!
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.
7 listopada 2025
Opinia niezależna
Odpowiedź od Fat Scientist
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.
Prevents me from making dosing mistakes
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!
9 października 2025
Opinia niezależna
Odpowiedź od 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.
Fat Scientist saved my weight loss journey!
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!
23 sierpnia 2025
Opinia niezależna
Odpowiedź od Fat Scientist
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!
Dosing Safely!
Even if I "know" my dose because it hasn't changed, I still plug the numbers into fatscientist as a back-up EVERY TIME. It's simple and intuitive - thank you fatscientist.com!
2 sierpnia 2025
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks Rebecca, so glad Fat Scientist can be your companion on this journey!
Very easy to use and straightforward.
23 stycznia 2026
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks Sandra, that's what we're shooting for! Simplicity, accuracy, and ease-of-use.
I look at Fat Scientist each week for…
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!
23 czerwca 2025
Opinia niezależna
Odpowiedź od Fat Scientist
Thanks Sarah! So glad that Fat Scientist has been an aid to you!
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 lutego 2026
Opinia niezależna
Odpowiedź od 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 września 2025
Opinia niezależna
Odpowiedź od 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 lutego 2026
Opinia niezależna
Odpowiedź od 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 marca 2025
Opinia niezależna
Odpowiedź od 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 stycznia 2026
Opinia niezależna
Odpowiedź od Fat Scientist
So glad to hear it Angelique! Good to have you in the Fat Scientist family.
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