For Peptide Biohackers
Your protocol got geometrically harder. Your tools stayed linear.
Multi-compound stacks — BPC-157, TB-500, Tesamorelin, GHK-Cu — each with its own vial strength, bac water ratio, injection site, and half-life. My Pep Calc handles the math so you don't ruin another vial.
Start tracking free →The problem
Five compounds. Three schedules. One notes app.
Wrong reconstitution math
Drew 30 units when you needed 10 because your spreadsheet didn't carry the calculation. That vial had six doses. Now it has two.
Missed rotation
Four sites per compound, four compounds, rotating blind. Lipodystrophy is not an outcome you log retrospectively.
Stacked half-lives
BPC-157 clears in 4 hours. TB-500 lingers for days. Running them on the same schedule means your active load chart looks nothing like what you intended.
No correlation layer
Something changed — sleep, recovery, energy. You have no idea which variable moved because you never wrote it down systematically.
The solution
Built for stacks, not single compounds.
Reconstitution calculator
Enter vial mg + bac water mL → get exact units to draw for your target dose. Works for any peptide. Saves every input.
Half-life chart
Real-time active-concentration curve across all compounds in your stack. See overlapping loads before they become a problem.
Site rotation tracker
Body-map UI with 8 injection zones per compound. The app remembers where you last injected so you don't have to.
Dose log
One tap to log a dose. Every entry timestamped, every compound separated. Export your log in 30 seconds.
Stack templates
Pre-built logging templates for common stacks (healing, GH pulse, recovery). Customize to your own protocol in under two minutes.
Protocol Coach (Pro)
Ask questions about reconstitution math, dosing schedules, and half-life interactions. AI answers with your own data in context.
"Every compound you add, your protocol gets geometrically harder. Your tools stay linear. I built the calculator I needed so I'd stop making expensive math mistakes."
Marcus R. — 3+ years on peptides, Founder member #1
Free tier. No credit card. Ready in 90 seconds.
Log up to 3 compounds on the free tier. Upgrade to Pro when you need the full stack and Coach access.
My Pep Calc is a tracking tool, not a medical service. Nothing here is medical advice. Medical Disclaimer