CALCULATOR / SHAREABLE URL

Cache size estimate

Estimate the memory needed for a hot working set.

ASSUMPTIONS / EDITABLE

Estimate the memory needed for a hot working set.

Hot keys

keys

Average value size

Memory overhead

ESTIMATED CACHE SIZE2,075.2gigabytes, estimated

Hot keys × value kilobytes × memory overhead ÷ 1,024

An estimate is a starting assumption, not a capacity promise. Add replication, metadata, indexes, protocol overhead, and growth margin for a production plan.

USE THE NUMBER, NOT THE VIBE

Back of the envelope estimates narrow the design space. They do not replace a load test or a measured workload.