Math 21
Autumn 2026

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Office hours may be subject to slight changes from week to week. Any changes will be reflected on this page.

You are encouraged to attend the office hours provided by any of the instructors or teaching assistants, regardless of which lecture or discussion section you are enrolled in, and no appointment is ever necessary.

All of the math offices are in Building 380 (the Math Corner). The "382" offices are on the second floor, the "381" offices are on the first floor, and the "380"s are in the basement. Note that to enter the building after 4:30pm or on weekends, you have to use the first-floor front entrance which faces the Oval.

Below this line, you should be able to see a google calendar with the office hours of the instructors and course assistants. It doesn't always work on mobile or in a google chrome browser. You may need to use the incognito mode or use a different browser such as Safari.

The Stanford University Mathematics Organization (SUMO) works with the Stanford Math department to provide free drop-in tutoring services for Math 21. The tutors are Stanford undergraduates available to answer any questions you have about the material and homework in Math 21. Just show up and the tutors will help you out. Starting the second week of each quarter, SUMO tutoring for Math 21 is on Sundays, Mondays, and Tuesdays from 6pm-10pm in Room 380-381T on the first floor of the Math department; it is also on Tuesday 10pm-midnight on Zoom. Tutoring continues through Dead Week but excludes university holidays.

The Center for Teaching and Learning offers free drop-in and individual appointment tutoring. To schedule an individual appointment, visit studentlearning.stanford.edu/tutoring. To view our drop-in schedule and to view information about tutoring for other courses, visit tutoring.stanford.edu.

Autumn 2026 -- Department of Mathematics, Stanford University