InjectBuddy is a free set of dosage calculators for TRT (testosterone replacement therapy), peptide reconstitution, GLP-1 medications (semaglutide, tirzepatide), BMI, and free testosterone index. Every calculation happens instantly in your browser — no login, no account, no data sent to a server.
The site was built by Pouroa Frew, a developer based in Auckland, New Zealand, to provide accurate, transparent maths for people navigating hormone therapy and peptide protocols. Each calculator uses standard clinical formulas with your inputs and returns the result immediately. Nothing is stored.
These are mathematical tools, not medical advice. Always verify your dosing with your prescribing doctor or pharmacist before injecting.