Size and estimate costs for Azure Cache for Redis across Basic, Standard, Premium, and Enterprise tiers with sharding support.
Standard Tier Features
| Tier | SLA | Max Memory | Replication | Clustering | Persistence | Geo-Repl. | Price Range |
|---|---|---|---|---|---|---|---|
| Basic | None | 53 GB | No | No | No | No | $16–$799/mo |
| Standard | 99.9% | 53 GB | Yes | No | No | No | $20–$1,183/mo |
| Premium | 99.9% | 1.2 TB (10 shards) | Yes | Up to 10 shards | RDB / AOF | Active-passive | $404–$64,707/mo |
| Enterprise | 99.999% | 100 GB | Yes | Built-in | Yes | Active-active | $681–$4,925/mo |
| Enterprise Flash | 99.999% | 1.4 TB | Yes | Built-in | Yes | Active-active | $3,346–$11,117/mo |
The Premium tier is built on open-source Redis and supports clustering via hash-slot sharding (up to 10 shards), VNet isolation, active-passive geo-replication, and RDB/AOF persistence. The Enterprise tier is powered by Redis Ltd.'s Redis Enterprise and includes active-active geo-replication, built-in Redis modules (RediSearch, RedisJSON, RedisBloom, RedisTimeSeries), and a 99.999% SLA with zone redundancy.
Premium-tier clustering partitions your keyspace across multiple shards using CRC16 hash slots (16,384 total). Each shard is a primary/replica pair. Adding shards scales both memory and throughput linearly. Cost is multiplied by the shard count. For example, a P2 (13 GB) with 5 shards provides 65 GB usable memory at 5× the P2 price.
RDB (snapshot): Periodic point-in-time snapshots written to Azure Storage. Lower performance impact but potential data loss between snapshots. AOF (append-only file): Logs every write operation. Higher durability (minimal data loss) but more I/O overhead. Both options are available on Premium and Enterprise tiers.
Active-passive (Premium): One-way replication from a primary cache to a secondary cache in another region. Manual failover required. Active-active (Enterprise): Multi-region read/write with conflict-free replicated data types (CRDTs). Automatic conflict resolution and near-zero RPO.
Enterprise Flash uses a combination of DRAM and NVMe flash storage to offer large cache sizes (up to 1.4 TB) at a lower cost per GB than pure in-memory tiers. Ideal for workloads with large datasets where sub-millisecond latency is not critical for every operation. Hot data stays in DRAM while warm data is on flash.
All prices shown are for the East US region and represent list (pay-as-you-go) pricing. Actual costs may vary by region. Reserved pricing (1-year or 3-year) can save 30–55% on Premium and Enterprise tiers. Data transfer and storage for persistence are billed separately.
The Azure Redis Cache Sizer helps you select the right Azure Cache for Redis tier and configuration based on your performance, capacity, and high availability requirements. It covers Basic, Standard, Premium, and Enterprise tiers with options for clustering, sharding, geo-replication, and data persistence. Enter your expected memory requirement, connection count, and throughput needs to get tier recommendations and monthly cost estimates. The tool also helps you understand the tradeoffs between single-node Basic for development, replicated Standard for production, and Premium or Enterprise for advanced features like VNet injection, active geo-replication, and Redis Modules.
Disclaimer: This tool runs entirely in your browser. No data is sent to our servers. Always verify outputs before using them in production. AWS, Azure, and GCP are trademarks of their respective owners.