Built by Pouroa Frew
Why this exists
I'm a developer based in Auckland, New Zealand. I'm not a doctor, pharmacist, or medical professional of any kind.
When I started managing a TRT protocol, I kept running into the same problem: calculating the exact volume to draw from a vial is simple arithmetic (dose ÷ concentration = volume), but there was no clean, fast, no-nonsense tool to do it. Most calculator pages I found were cluttered, plastered with ads, required accounts, or buried the result in noise.
So I built InjectBuddy. Then I added the peptide reconstitution calculator because the same friction existed there. Then BMI and free testosterone index, because they're related tools people in the TRT community regularly need.
All four calculators perform standard mathematical operations on numbers you already have from your doctor or blood panel. Nothing more.
What InjectBuddy is
InjectBuddy is a free, browser-based calculator suite. It does maths. It does not store your inputs, share data with anyone, require a login, or sell anything. Calculations happen locally in your browser — nothing is sent to a server.
It is not a medical service. It does not diagnose conditions, recommend protocols, or give medical advice of any kind. It does division and multiplication correctly and shows you the result.
Built by Pouroa Frew — developer, not a medical professional. InjectBuddy performs standard volume and ratio calculations based on your inputs. These calculators do not constitute medical advice — always verify dosing with your prescribing doctor or pharmacist.
The calculators
Contact
There is no support team. If you find a calculation error, the most reliable way to flag it is via the site's GitHub repository or by emailing the address linked from there. I'll fix genuine errors promptly — the whole point is that the maths is correct.