Azure Event Grid quotas and limits

This article lists quotas and limits in Azure Event Grid.

Note

The following limits listed in this article are per region.

Events limits in namespace

The following limits apply to events in the Event Grid namespace resource.

Limit description	Limit
Namespace topics	100 per TU
Event ingress	1,000 events per second or 1 MB per second per TU (whichever comes first)
Event egress (push and pull APIs)	Up to 2,000 events per second or 2 MB per second per TU
Event egress (acknowledge, release, reject, and renew lock APIs)	Up to 2,000 events per second or 2 MB per second per TU
Maximum event retention on namespace topics	7 days
Subscriptions per topic	500
Maximum event size	1 MB
Batch size	1 MB
Events per request	1,000

The following limits apply to Event Grid custom topic, system topic, and partner topic resources.

Limit description	Limit
Custom topics per Azure subscription	100 When the limit is reached, you can consider a different region or consider using domains, which can support 100,000 topics.
Event subscriptions per topic	500 This limit can't be increased.
Publish rate for a custom or a partner topic (ingress)	5,000 events or 5 MB per second (whichever comes first) An event is counted for limits and pricing purposes as a 64-KB data chunk. So, if the event is 128 KB, it counts as two events.
Event size	1 MB This limit can't be increased.
Maximum event retention on topics	1 day This limit can't be increased.
Number of incoming events per batch	5,000 This limit can't be increased.
Private endpoint connections per topic	64 This limit can't be increased.
IP firewall rules per topic	128

The following limits apply to the Event Grid domain resource.

Limit description	Limit
Domains per Azure subscription	100
Topics per domain	100,000
Event subscriptions per topic within a domain	500 This limit can't be increased.
Domain scope event subscriptions	50 This limit can't be increased.
Publish rate for a domain (ingress)	5,000 events or 5 MB per second (whichever comes first) An event is counted for limits and pricing purposes as a 64-KB data chunk. So, if the event is 128 KB, it counts as two events.
Maximum event retention on domain topics	1 day This limit can't be increased.
Private endpoint connections per domain	64
IP firewall rules per topic	128