Peptide Calculators & Tools — Free

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Reconstitution Calculator

Full reconstitution walkthrough with peptide-specific vial sizes and suggestions for round syringe marks.

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Dose Calculator

Convert any peptide dose into exact insulin syringe units based on your vial size and BAC water volume.

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Half-Life Calculator

Interactive decay curve showing peptide blood concentration over time. Pre-loaded with 55+ peptides.

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BAC Water Calculator

How much bacteriostatic water to add to your vial for clean, round syringe marks at your target dose.

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GLP-1

Semaglutide Calculator

Syringe units plus a full 12-week titration schedule. Works for compounded semaglutide in any vial size.

Track everything in one place

PepStackr tracks your vials, logs injections in one tap, reminds you when to dose, and shows your blood concentration curve — all while you keep using the calculators above. Free to start.

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Why Use These Tools?

Reconstituting peptides and calculating doses is one of the easiest places to make a mistake. A wrong number of units can mean you've under-dosed (no effect) or over-dosed (bigger side effects). Yet most online guides assume your setup matches theirs — a specific vial size in a specific volume of water.

These tools calculate for your actual vial and your actual reconstitution. The math is transparent: every calculator shows the concentration, the volume, and the units so you can verify the numbers against your syringe before injecting.

What's missing?

If there's a peptide tool you'd like us to build, create an account and let us know. We build what our community asks for.