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.
What people say
A
Amy · 3 reviews · Experienced 2025-06-22 ·
★★★★★
Life saver !
This calculator has calmed my anxiety countless times when first starting out and adjusting my doses. It’s incredibly easy to use, and I love how you can reverse search to see “if I want “X” mg, I need to take “Y” units.
Reply from Fat Scientist2026-03-15
Thanks Amy! Very pleased to hear the reverse dose (aka "How much did I take?") calculator has been useful for you! Plus injecting yourself, especially at the start, is definitely kind of scary, so glad to hear Fat Scientist could help remove some of the anxiety.
H
Happy User · 1 review · Experienced 2026-02-21 ·
★★★★★
Super helpful tool!
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 and it was exactly what I needed. The user guides are really helpful and I still use it every week to calculate my dose. It’s incredibly helpful when I’m finishing up one vial and need to get the rest of my dose from a second vial. I could never figure that out without this tool.
Reply from Fat Scientist2026-03-15
Thank you so much for this! The multi-vial split is one of those problems that sounds simple until you actually try to work through it -- really glad Fat Scientist could untangle that for you. Welcome to the community!
