CDN cache hit savings scenario calculator

Estimate a theoretical monthly reduction in origin data transfer from a byte-based cache hit share. Use traffic measured for the same period and scope in your CDN or host analytics where available. The result is a scenario, not a prediction or price estimate.

Enter all three values and calculate.

Method and assumptions

Modeled origin transfer after cache = eligible origin transfer × (1 − byte hit share) + non-cacheable origin transfer. Modeled reduction = eligible origin transfer × byte hit share. This assumes the hit percentage applies to transferred bytes, uses one consistent month and traffic scope, and that a hit avoids sending the response body from the origin.

Use a data-transfer or bytes-based cache metric if your CDN provides one. A request hit ratio is not necessarily a byte hit ratio: small and large objects can have different hit behavior. Cloudflare Cache Analytics has separate Requests and Data Transfer views; its documentation describes Data Transfer as useful for cost analysis and notes that revalidated requests count differently between those views. Match the metric and scope before using it here.

What this does not estimate

This arithmetic does not measure your CDN, determine cache eligibility, account for cache fills, purges, revalidation traffic or tiered-cache behavior, or predict provider billing. It excludes request counts, origin compute, performance, CDN fees, and traffic not included in the inputs. Check the service's analytics, caching rules, and billing definitions for your actual setup. A lower modeled origin transfer is not a guaranteed cash saving.

Sources

• Cloudflare Cache Analytics — separates Requests and Data Transfer views and explains what each represents; last updated October 27, 2026, checked November 3, 2026.
• Cloudflare Cache overview — describes caching and cache rules; last updated April 16, 2026, checked November 3, 2026.

For a page-view transfer scenario from user-entered traffic assumptions, see the page-view bandwidth calculator. For a provider-term checklist, read the bandwidth limits guide.