Frontend Engineering Tools
CDN Cache Hit Rate Calculator
Enter monthly requests, cache hit rate, and cost per request to compute origin offload, cost savings from improvement, and monthly CDN savings.
No data is transmitted — everything runs locallyTool
Example — Representative default scenario — requests per day 250000 · hit rate % 92 · origin cost per 1000 0.12.
Cache hit rate
78%
7,800,000 hits / 10,000,000 reqs
Monthly cost
$94.00
CDN + origin costs
Origin offload
78%
requests not hitting origin
Savings at 95% hit
$44.00
potential improvement
About this tool
CDN Cache Hit Rate Calculator
The CDN Cache Hit Rate Calculator computes origin offload ratio, monthly cost savings from hit rate improvement, and optimal cache strategy guidance.
• Calculate origin offload from a 95% vs 78% cache hit rate
• Model monthly savings from improving cache hit rate through better Cache-Control headers
• Estimate the cost impact of adding cache-busting query parameters that lower hit rate
• Justify CDN cost vs origin cost at current traffic volume
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Developer-friendly cloud infrastructure. DigitalOcean provides cloud compute, networking, and managed databases with predictable pricing.
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FAQ
What does this tool tell you?
The CDN Cache Hit Rate Calculator computes origin offload ratio, monthly cost savings from hit rate improvement, and optimal cache strategy guidance.
What affects the result most?
Cache hit rate = CDN_served / total_requests — should be >90% for static assets. Origin offload: 95% hit rate = 20× reduction in origin traffic — scales without origin cost. Miss penalty: cache miss goes to origin — latency = edge_to_origin RTT + server processing time.
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.
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