tech calculator
Redis Cluster Memory Sizing & Sharding Planner
Estimate Redis RAM footprint, cluster sharding layouts, replication buffers, and key-value overheads.
Inputs
Keys Specs
Data Type & Memory Overhead
Cluster Sizing
Results
Total Cluster RAM Recommended
17.95 GB
Total Cluster Nodes Count
6 nodes (3 Masters, 3 Replicas)
Formula
Redis Cluster Memory formula
Node RAM = ( Data_Per_Shard × COW_Factor ) + Replication_Backlog + OS_ReserveEstimates key-value storage overheads factoring in Redis dictEntry allocations and copy-on-write memory forks.
Step by step
How the calculation works
- 1Enter the total number of keys in millions.
- 2Define the average size of keys and values in bytes.
- 3Select the primary Redis data type to load type-specific struct overheads.
- 4Configure shard counts and replica settings to size cluster layout configurations.
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