Add a co-teacher to a class

This article is for teachers.

You can invite teachers to join your class to help coordinate class activities. If you use Google Groups, you can also invite a group of co-teachers at the same time. 

Your Google Workspace administrator might only allow teachers and students from your school to join classes. If you want to add a teacher from another school, contact your admin to update your domain's class membership settings.

What can co-teachers do?

Co-teachers can do the same tasks as the primary teacher, except they can't delete a class, remove the primary teacher, or mute another teacher in the class.

Invite co-teachers

To invite teachers using Google Groups, you don't have to be the owner or a member of the group. However, you must be able to view group members and email addresses. If you can't view the list, contact your administrator to change the permissions. Learn more about troubleshooting invitations

 Invite a teacher to co-teach your class

  1. Go to and click Sign In.

    Sign in with your Google Account. For example, or you@gmail.comLearn more.

  2. Click the classand thenPeople.
  3. Click Invite teachers .

    You can invite individual teachers or a group.

  4. Enter the email address of the teacher or group.

    As you enter text, Classroom shows matching addresses that you can choose from.

  5. From the list, click a teacher or group.
  6. (Optional) To invite more teachers or groups, repeat steps 4–5.
  7. Click Invite.

Accept an invitation to co-teach a class

Invited teachers get an email asking them to co-teach your class. To join the class, the invited teacher must click a link in the email, or sign in to Classroom and click Accept on the class card.

Limits on class size and groups

Class size limits

Limits on class size depend on the type of account you use with Classroom.

Account type Limits
Google Workspace for Education
  • The maximum teachers for a class is 50. You can invite more, but only 50 can join.
  • The maximum members (teachers and students) is 1,000.
Personal Google Accounts
  • The maximum teachers for a class is 50. You can invite more, but only 50 can join.
  • The maximum members (teachers and students) is 250.
  • Teachers with a personal Google Account also have additional limits on activity, such as creating classes or inviting students. For details, go to Limits when using Classroom.

Limits for Google Groups

Classroom uses Google Groups for all students and teachers with Google Workspace for Education accounts.

  • Each person can only be in a certain number of groups.
  • If you invite a group to join a class as co-teachers, the group must have 10 or fewer members.

For more details, go to Understand Groups policies and limits.

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