OptiPin
Free calculators
Nine free, no-login tools for TRT, peptides, and GLP-1. Every calculation can also be tracked and forecast over time in the OptiPin app.
Peptide Reconstitution Calculator
Enter vial size, BAC water, and target dose for the exact syringe units. 200+ medications, typical-dose hints, and one-tap blend expansion (GLOW, KLOW, Wolverine, and more).
Free Testosterone Calculator
Vermeulen equation — total T, SHBG, and albumin → free and bioavailable testosterone and percent free.
TRT Dose Calculator
Weekly dose + concentration + frequency → mL and insulin units per injection, and how long a vial lasts.
Half-Life Visualizer
Plot single-dose and steady-state blood-level curves for 60+ compounds, with time to peak and steady state.
Compound Half-Life Chart
Sortable reference table of half-life, time to peak, route, and time to steady state for 60+ compounds.
HCG Dose Calculator
Vial IU + bacteriostatic water + target dose → insulin units to draw, concentration, and doses per vial.
Vial Longevity & Cost
Doses and weeks per vial plus cost per dose — works for peptides (total mg) or oil vials (size × concentration).
GLP-1 Titration Schedule
The standard manufacturer titration for Wegovy, Ozempic, and Mounjaro/Zepbound, mapped to dates from your start date.
Low Testosterone Quiz
10-question ADAM screening questionnaire — see whether your symptoms match the low-testosterone pattern. Educational, not a diagnosis.
Track and forecast it all in OptiPin
Log doses, rotate sites, manage inventory, and forecast testosterone, estrogen & GLP-1 levels between blood draws — all on-device, no account required.
Download on the App Store