CDN Cache Savings Calculator
Estimate origin traffic reduction from cache hit rate.
Your inputs
Calculation results
Formula & assumptions
Origin requests = total × (1−hit fraction); actual caching varies by response.
Values use the specified units. Calculations use floating-point arithmetic. Check input measurements and formula assumptions before applying the result.
Compare your scenarios
Save up to five results to compare changes side by side. Scenarios stay in this tab until you clear or reload it.
Using CDN Cache Savings Calculator
Estimate origin traffic reduction from cache hit rate.
- Enter requests per day, cache hit rate, mean response size using the units printed under each field.
- Choose Calculate, or enable live updates. Review the result labels and formula assumptions.
- Save scenarios to compare up to five variations, then copy the report or download JSON or CSV.
Example
Requests per day: 100000 requests Cache hit rate: 90 percent Mean response size: 50 KiB Origin requests per day: 10000 Requests served from cache: 90000 Origin transfer · GiB: 0.47683716 Transfer saved · GiB: 4.2915344
Questions & answers
What does CDN Cache Savings Calculator calculate?
Estimate origin traffic reduction from cache hit rate.
Which units should I enter?
Requests per day uses requests. Cache hit rate uses percent. Mean response size uses KiB. Convert values to these units before calculating.
Which formula does it use?
Origin requests = total × (1−hit fraction); actual caching varies by response.
What does the included example show?
Requests per day: 100000 requests; Cache hit rate: 90 percent; Mean response size: 50 KiB. Result: Origin requests per day = 10000; Requests served from cache = 90000; Origin transfer · GiB = 0.47683716; Transfer saved · GiB = 4.2915344.
Can I compare different settings?
Yes. Save a scenario, change the inputs and save another result. Up to five scenarios are compared in this tab; they disappear when you reload or leave.
Can I export the calculation?
Copy the JSON report or download JSON and CSV with inputs, result labels and numeric values. Processing uses local JavaScript; no calculation request is sent to our server. Displayed values use up to 10 significant digits; exports retain JavaScript numeric precision.
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