Cache Hit Ratio Savings Calculator
Estimate origin request spend avoided by cache hits, subtract the cache’s monthly cost, and see the hit rate required to break even.
Runs locally; use your measured hit ratio and billing rates. Maintained by Buildopsy · Updated .
Monthly cache scenario
Origin price is entered per million requests. Cache cost is a separate monthly estimate that you provide.
Formula and assumptions
Origin spend = monthly requests in millions × origin price per million. Avoided origin spend = origin spend × hit ratio. Net savings subtracts monthly cache cost.
This estimates request charges only. It excludes origin compute, egress, cache misses by object size, invalidation fees, storage, and latency or availability benefits. Do not treat modeled savings as a provider quote; use invoice rates and production hit ratios.
Frequently asked questions
How are cache savings estimated?
Monthly origin request spend is multiplied by the hit ratio, then the monthly cache cost is subtracted. Other origin costs are outside this model.
What if break-even hit rate is above 100%?
Under the entered request-only rates, even a perfect hit ratio would not offset the cache cost. Include any other measurable benefits separately when evaluating the design.
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