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
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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... Toon meer
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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... 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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So easy to use!
This calculator is so useful! I’ve been on Tirzepatide for just over a year and have bought product from various telehealth companies, whose products have arrived in various concentrations. I still go to the calculator before every shot to be certain that I’m injecting the right dosage. So grateful to have access to Fat Scientist.
25 februari 2025
Review zonder uitnodiging
Using it since I discovered GLP-1s
Have been relying on the site since day1 of my GLP-1 journey. I recommend it for everyone who uses, or is considering, compounded GLPs for weight loss.
1 november 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Joe! Really glad Fat Scientist has been there from day one, and appreciate you recommending it to others.
Used the site to increase my confidence…
Used the site to increase my confidence in my dosing. I had a list of how many units per week from my doctor - I was able to backwards math that to determine the mgs per week and then adjust as needed. While I could do the math myself to convert ml to mg and units, this website has been invaluable in calculations. I also greatly appreciate the information on understanding the label (and the quiz!) - so glad this all is on one site and free!
19 december 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thank you! Really glad the reverse dose calculator helped bridge the gap between your doctor's instructions and what you actually needed to draw. And so pleased the label guides and quiz have been useful too — that's exactly the kind of all-in-one resource we set out to build.
Great site always comes in handy when I…
Great site always comes in handy when I get a new vial!
20 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Mochelle! New vial day is exactly when you want to double-check — glad Fat Scientist is there for it.
Accurate and easy to use
Intuitive and easy to use. Accurate measurements.
14 april 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks! Intuitive, accurate, and easy to use — that's exactly what we aim for.
Very grateful for Fat Scientist site
I use this site every week to make sure I’m giving the right dose. It’s helped so much with my anxiety and second guessing my own calculations.
6 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Erin! Removing that second-guessing and anxiety around dosing is so important — really glad Fat Scientist has been able to provide that peace of mind each week.
It’s sometimes difficult to transfer mg…
It’s sometimes difficult to transfer mg to units and FS helped me with that. I also changed providers which meant a change in concentration. Thankfully I had FS available to calculate the correct dosage!
16 oktober 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Lindia! Switching providers and dealing with a new concentration is one of the trickier situations — really glad Fat Scientist was there to help you navigate it.
Great site for GLP-1 support
Great site for GLP-1 support! Use this site to calculate doses and learn about different dose options. Highly recommend!
22 februari 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks! Really glad Fat Scientist has been useful for both the calculations and learning about dosing options — and appreciate you recommending it!
As a Newbie to Injectables, It's Been Invaluable
I was a new user to injectable medicine and use this site to find out the correct amount of units for my dose. I use it every time I draw up a dose, just to make sure I'm getting the right amount. It's an incredible tool and I highly recommend this site as trustworthy.
17 november 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Stephanie! Being new to injectables can feel daunting, so really glad Fat Scientist has been able to provide that extra layer of confidence every time you draw up your dose.
Incredibly helpful Tool!
Incredibly helpful tool to ensure proper dosage of Tirzepatide. Very easy and user friendly to use. They also provide education on how to read and understand your vials.
9 november 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Nicole! So glad Fat Scientist has been useful for both the calculations and understanding your vials — that education piece is really important to us.
Vital tool for compounded GLP-1 users
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 rescue. I use it weekly now for over a year to double check my measurements from vial and confirm I am dosing correctly. Definitely recommend. Such a vital tool for compounded Glp-1 users.
22 februari 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Tara! That weekly check-in for peace of mind is exactly what Fat Scientist is here for. Really appreciate the kind words and the recommendation.
Great tool
Great tool. Does the math for you and teaches you how to use the tool correctly.
1 januari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thank you! Doing the math and helping you understand how it works — that's the combination we're going for.
Super useful tools that I use weekly
Super useful tools that I use weekly. Owner is fantastic and responsive.
7 december 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Jenna! Really appreciate the kind words — so glad Fat Scientist has been a useful weekly resource for you. And I'm so grateful for the feedback and support, it's a pleasure to be responsive!
I really needed this service
I really needed this service. Easy way to calculate what dosage I needed based on my mg/ml. Good and valid information about subjects pertaining to dosage, reading labels, etc. I give Fat Scientist 👍👍I use this service every week to double check my dosage.
15 juli 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Lorrie! Really glad the calculator and educational content have both been useful — and appreciate the double thumbs up! 👍👍
Helped me calculate with ease
Helped me calculate with ease. I love that you can calculate any meds that need splitting. And the reverse option!
21 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks! So glad the split dose and reverse calculators have both been useful — those tend to be the trickiest scenarios for people to navigate.
The easiest and most accurate way to…
The easiest and most accurate way to calculate dosing! Lots of great information to keep you on track.
19 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Jane! Accuracy and great information in one place — that's exactly what we're going for.
Makes dosing easy and safe
I have been using the dosing calculator and reverse dose calculator on Fat Scientist since beginning my peptide journey last year. This site is the best and has made dosing so easy and safe. I have piece of mind every time I inject thanks to Fat Scientist.
22 februari 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thank you! So glad both the dosing and reverse dose calculators have been useful since you started your journey. That peace of mind on injection day is exactly what we're here for.
This app is one of the best apps I have…
This app is one of the best apps I have ever used. I would be lost without it. It is intuitive and is packed with so much information. Not only can you calculate your medication, but you can learn about so many topics.
22 februari 2026
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Sharon! So glad the calculators and educational content have both been valuable to you — having it all in one place is exactly what we were going for.
The best Tirzepatide dosing calculator
Started using the calculator to confirm my dosing on Tirzepatide. Extremely useful and accurate website!
28 augustus 2025
Review zonder uitnodiging
Antwoord van Fat Scientist
Thanks Tabhata! Confirming your dose before you inject is always a good idea — really glad Fat Scientist has been useful for you.
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