This calculus-level textbook (in multiple volumes) uses infinitesimal methods developed by the author and debuted in articles in The American Mathematical Monthly (Feb. 2018) and The College Mathematics Journal (to appear). The book is in the classroom testing stage in first-semester calculus and most of second-semester calculus.Features of the textbook include a student-friendly narrative that helps the student think through the development of concepts; a larger font and less-cramped style than popular calculus texts; reading exercises in the narrative; margin notes giving explanations, tips, cautions against common errors, and other notes of interest; hundreds of examples with complete solutions, some of which include details of the thinking process; thousands of exercises of various levels of difficulty, including rapid response exercises meant for in-classroom use; answers to odd-numbered exercises that sometimes include hints, brief explanations of common incorrect answers, alternate forms of answers, or both simplified and unsimplified answers; a review section on avoiding common errors; and an extensive index. These features make the book suitable for individual study as well as classroom use.Since the book is in a preliminary edition, readers are invited to give the author feedback at bdawson@uu.edu.