Estimate Azure Event Grid costs based on operations and event delivery.
Last verified: May 2026
Total event publish and management operations. First 100,000/month are free.
Operations using advanced filtering ($0.09 per million). No free tier.
Each delivery attempt counts as an operation toward the operations total.
Blob storage for dead-lettered events at $0.02/GB/month.
Output will appear here...The estimator counts billable operations as: events published × 1 (ingress) + (events × subscriber count × retry factor) for delivery. Retry factor accounts for subscriber failure rate (default 1.05x assuming 5% retry). Free tier 100K ops/month is subtracted before applying $0.60/M rate. Dead-letter operations (when configured) add another count per failed event.
The Azure Event Grid Cost Estimator calculates monthly costs based on event operations volume. Event Grid pricing is straightforward with a per-million-operations charge, but understanding what counts as an operation and how event delivery retries factor in is important for accurate estimates. The tool covers both Event Grid topics and system events from Azure services.
Your team's storage account fires Event Grid events on every blob upload, with 4 subscribers each. The bill jumped from $5 to $200/month when a new ML pipeline started uploading 10 small files per analysis × 5K analyses/day. The estimator backs out: 1.5M events × 4 subscribers = 6M delivery ops/month at $0.60/M = $3.60 — but the math doesn't match the bill. Investigation reveals one subscriber (the Function) was throwing 500s, causing 12x retry amplification = $43 from retries alone, and another subscriber doing image processing triggered 5x cascading events. You add filtering, fix the failing Function, and bring it back under $20/month.
Failed delivery retries are the silent cost driver. A subscriber that's down for 6 hours generates 8-12 retry attempts per event during exponential backoff — each counted as a billable operation. Always configure dead-letter destinations and alert on dead-letter queue depth so you catch failing subscribers before retry costs spiral.
Event Grid's per-million pricing seems trivially cheap until you hit volume. A microservice fleet generating 10 events/sec averages 26M events/month = ~$15/month. But add 5 subscribers each receiving every event = 5x delivery operations = ~$75/month. Filtering subscribers by event type early cuts this dramatically.
System events (resource creates/deletes) are FREE on the source side but charged on delivery. Subscribing every blob upload across a busy storage account to a Function can generate millions of events/month. Use subject prefix filtering to only deliver events you actually need.
An operation includes event ingress (publishing), event delivery attempts (including retries), and management calls. The first 100,000 operations per month are free. After that, pricing is approximately $0.60 per million operations. Failed delivery retries count as additional operations.
Event Grid is designed for reactive event-driven architectures with push delivery to subscribers at low latency. Event Hubs is a high-throughput streaming platform for time-series data ingestion. Use Event Grid for discrete events (resource created, blob uploaded) and Event Hubs for continuous data streams (telemetry, logs).
Event Grid provides at-least-once delivery with configurable retry policies. It retries delivery for up to 24 hours with exponential backoff. If delivery fails after all retries, events are either dead-lettered (if configured) or dropped. Subscribers should implement idempotent event handling.
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