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Dosavy
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Peptide and compound calculators

Six of them, free and public. The same functions run inside the app: a draw volume you get here is the draw volume the logger uses.

01The six
Reconstitution
Vial size and BAC water in, concentration and syringe units out, with a visual fill indicator.
Flagship
Half-life
How much of a compound remains after a given interval, and when it settles at steady state.
Vial longevity
How long a reconstituted vial lasts at your schedule, and when to order the next one.
Cost per dose
Vial price against doses per vial, so suppliers compare on the number that matters.
Unit converter
IU, mcg and mg in both directions, including insulin-syringe units.
GLP-1 titration
Lay a titration schedule against real dates and see the whole ramp at once.

Reconstitution also has a page per compound, prefilled with that vial’s mixing parameters and carrying its evidence status.

02Why the math matters

Unforgiving arithmetic, written out

A peptide arrives as lyophilized powder in a multi-dose vial, and the label states total mass, not concentration. The concentration is whatever you make it when you add Bacteriostatic Water (water carrying 0.9% benzyl alcohol as a preservative), which is what lets a punctured vial be used across weeks rather than once. Every number downstream of that decision follows from it: the draw in U-100 syringe units, doses per vial, days of runway, cost per dose. The classic failure mode is a slip of ×10 somewhere between mg and mcg.

The six tools cover that chain. Reconstitution turns a vial and a diluent volume into a draw. Half-life turns a dosing interval into levels over time. Vial longevity and cost per dose turn a protocol into a supply date and a budget. The unit converter handles mg, mcg and compound-specific IU factors, and the GLP-1 titration tool restates the published escalation schedules with their sources.

Each page shows its formula written out so you can check it by hand: the app runs these exact functions, not a second implementation that drifts. No account, no paywall, on any of them.