// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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dev.ttl-cache-memory Calculator
Calculates the memory footprint of a TTL-based cache from item count, item size, and overhead of expiration tracking. Redis TTL expiry uses lazy deletion plus active expiry — approximately 25% of expired keys are deleted per second, keeping memory usage bounded.
Inputs
Entry Count
Reference formula or conversion factor shown for context.
Entry Size Kb
Reference formula or conversion factor shown for context.
Ttl Seconds
Reference formula or conversion factor shown for context.
Requests Per Sec
Reference formula or conversion factor shown for context.
Results
cache memory (MB)
CAC (customer acquisition cost) -- total sales and marketing spend divided by new customers acquired. Healthy LTV:CAC ratio is 3:1 or higher.
entry churn rate (evictions/s)
The value at the specified point or condition.
total ops/sec (reads+evictions)
The combined total across all inputs and components.
hit rate for cost savings
Total money or resources saved compared to the baseline or alternative scenario.
TTL
Reference formula or conversion factor shown for context.
Redis max memory recommendation
Suggested action or value based on the computed results and applicable best-practice guidelines.