Thomas’ Calculus: Early Transcendentals, Fifteenth Edition in SI Units, continues itstradition of clarity and precision in calculus with a modern update to the popular text. Theauthors have worked diligently to add exercises, revise figures and narrative for clarity, andupdate many applications to modern topics. Thomas’ Calculus remains a modern and robustintroduction to calculus, focusing on developing conceptual understanding of the underly-ing mathematical ideas. This text supports a calculus sequence typically taken by studentsin STEM fields over several semesters. Intuitive and precise explanations, thoughtfullychosen examples, superior figures, and time-tested exercise sets are the foundation of thistext. We continue to improve this text in keeping with shifts in both the preparation and thegoals of today’s students, and in the applications of calculus to a changing world.