This paper examines the self-measurement and self-tracking practices of a turn-of-thenineteenth-century Genevese pastor and pedagogical innovator, François-Marc-Louis Naville, who extensively used Benjamin Franklin’s tools of moral calculation and a lesser known tool, Marc-Antoine Jullien’s moral thermometer, to set a direction to his life and to monitor and improve his moral character. My contribution sheds light on how technologies of quantification molded notions of personal responsibility and character within an emerging utilitarian context. I situate Naville’s use of these tools within his work as a pastor in a parish of the (then occupied) Republic of Geneva and within the Genevese and Swiss pedagogical reform movement of the early nineteenth century. I provide a detailed examination of how Naville used and adapted Franklin’s and Jullien’s tools of moral accounting for his own moral and religious purposes. Time, God’s most precious gift to man, served Naville as the ultimate measure of his moral worth.