I am very careful about making sure I am taking the right dose I triple check before I draw up my dose, fat scientist has given me peace of mind. It's easy to use and understand and I love having all... Ver mais
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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... Ver mais
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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... Ver mais
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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... Ver mais
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Detalhes da empresa
Escrito pela empresa
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.
Informações de contato
Estados Unidos
- fatscientist.com
Accurate and easy to use
Intuitive and easy to use. Accurate measurements.
14 de abril de 2025
Avaliação não solicitada
Resposta de 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 de fevereiro de 2026
Avaliação não solicitada
Resposta de 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 de outubro de 2025
Avaliação não solicitada
Resposta de 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 de fevereiro de 2025
Avaliação não solicitada
Resposta de 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 de novembro de 2025
Avaliação não solicitada
Resposta de 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 de novembro de 2025
Avaliação não solicitada
Resposta de 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 de fevereiro de 2025
Avaliação não solicitada
Resposta de 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 de janeiro de 2026
Avaliação não solicitada
Resposta de 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 de dezembro de 2025
Avaliação não solicitada
Resposta de 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 de julho de 2025
Avaliação não solicitada
Resposta de 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 de fevereiro de 2026
Avaliação não solicitada
Resposta de 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 de fevereiro de 2026
Avaliação não solicitada
Resposta de Fat Scientist
Thanks Jane! Accuracy and great information in one place — that's exactly what we're going for.
Very easy to use!
27 de dezembro de 2025
Avaliação não solicitada
Resposta de Fat Scientist
Thanks Jamie!
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 de fevereiro de 2025
Avaliação não solicitada
Resposta de 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 de fevereiro de 2026
Avaliação não solicitada
Resposta de 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 de agosto de 2025
Avaliação não solicitada
Resposta de Fat Scientist
Thanks Tabhata! Confirming your dose before you inject is always a good idea — really glad Fat Scientist has been useful for you.
A Must Have!
When I first started compounded Tirzepatide, I knew nothing Jon Snow. Thanks to Fat Scientist I learned how to read my vials and had an easy way to establish dosing consistency and confidently! Fat Scientist has been a huge part of my journey and I recommend it to everyone! Thank you!
20 de outubro de 2025
Avaliação não solicitada
Resposta de Fat Scientist
Every good journey needs a maester — so glad Fat Scientist could fill that role for you, and really appreciate you recommending it to others!
Relieved any anxiety I had over choosing…
Relieved any anxiety I had over choosing a correct dosage. Very informative information for anyone getting started with self-administered injections.
9 de maio de 2025
Avaliação não solicitada
Resposta de Fat Scientist
Thanks Carol! Injecting yourself, especially at the start, is definitely kind of scary — so glad Fat Scientist could help remove some of that anxiety.
I’ve used Fat Scientist for my doses…
I’ve used Fat Scientist for my doses every week. I’m an RN and am fully capable of doing it on my own, but I use it anyway to confirm it before injecting medication into my body. It helps me feel safe knowing that I have such a sturdy confirmation tool.
16 de outubro de 2025
Avaliação não solicitada
Resposta de Fat Scientist
Thanks Brad! Very much appreciate the endorsement from a medical professional like yourself, and so glad to be of help.
For those using vials for their…
For those using vials for their medication this is an absolute must have. Takes all the guesswork out of knowing the dosage.
7 de fevereiro de 2026
Avaliação não solicitada
Resposta de Fat Scientist
Thanks James! Vial dosing has so many variables... really glad Fat Scientist can cut through the guesswork for you.
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