Node hours for a managed Redis or Memcached cache cluster.
Managed Redis bills every hour the node exists, so an oversized cluster or an unused replica is pure waste. Size it to the working set and reserve for steady load. Pair with the managed database calculator.
Free ElastiCache / Redis cost calculator — node type price, node count and replicas to your monthly cache bill.
Per node-hour, based on the instance type and its memory. A primary plus one replica for high availability means you pay for two nodes around the clock. There is no per-request charge — you pay for the running memory.
Right-size the node memory to your working set, drop replicas you do not need for availability, and buy reserved nodes for long-lived clusters. A cache that is far bigger than the hot data is just paying for empty RAM.