As a security measure, some activities in Classroom have limits depending on the type of account that you have.
Class limits
The value of these limits can change without notice to protect Google's infrastructure.
| Activity or feature | Google Workspace or school account |
Personal Google Account |
|---|---|---|
| Teachers per class | 20 | 20 |
| Class members (teachers and students) |
1,000 | 250 |
| Classes you can join | 1,000 | 100 maximum, 30 per day |
| Classes you can create | No limit | 30 per day |
| Class-member invitations you can send |
500 per day, per teacher | 100 per day, per teacher |
| Guardians per student | 20 | Feature not available |
| Email address visibility | No limit | Feature not available |
| Topics per class | 200 | 200 |
Note: You can invite more than 20 teachers, but only 20 teachers can join the class.
Groups limits
Classroom uses Google Groups for all students and teachers with a Google Workspace for Education account.
- 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 details, see Understand Groups policies and limits.