Storage Potency Half-Life Calculator
Estimate storage half-life from daily decay and project potency at custom day marks.
Important: This tool calculates storage half-life (time for vial potency to reach 50% in storage), not pharmacological/biological half-life in the body.
Formula: t½ = log(0.5) / log(1 − r) — derived from the first-order discrete decay model
P(t) = (1 − r)t, solving for t when P = 0.5. This is the standard pharmaceutical stability model per
ICH Q1A(R2)
(Waterman & Adami, Int J Pharm 2005, PMID 15778049).
Decay rates are [Model Estimates — PeptideClock].