Price the Repeated Minutes Saved by a Build Cache

How to Use This Tool

Multiply time saved per build by actual build count and runner price. Calculate monthly CI cache savings from builds, uncached duration, cached duration and paid runner minute rate.

The failure CI Cache Savings is designed to catch

A four-minute improvement is economically meaningful only when the affected workflow runs often enough to repay maintenance and cache storage. The boundary is the job stated in Price the Repeated Minutes Saved by a Build Cache; CI Cache Savings is not intended to score or transform a different workflow.

The CI Cache Savings input contract

The fields used for this specific operation are Builds per month, Uncached minutes, Cached minutes, Runner cost per minute. Keep the source values beside the CI Cache Savings result, because replacing the original would remove the evidence needed to reproduce or reverse the operation.

• For CI Cache Savings, Builds per month starts at 200 in the worked case; replace that example with the matching source value.
• For CI Cache Savings, Uncached minutes starts at 12 in the worked case; replace that example with the matching source value.
• For CI Cache Savings, Cached minutes starts at 8 in the worked case; replace that example with the matching source value.
• For CI Cache Savings, Runner cost per minute starts at 0.008 in the worked case; replace that example with the matching source value.

Worked result for CI Cache Savings

The executable case called Default decision scenario expects out: $6.40. Verify that observation before entering real material, and then change one CI Cache Savings field at a time so an unexpected direction or formatting change can be traced to a specific input.

Reading the CI Cache Savings output

It combines builds per month, uncached minutes, cached minutes and runner cost per minute into one decision result using the formula explained on the page. Apply that answer only when Builds per month, Uncached minutes, Cached minutes, Runner cost per minute describe the same scope and format as the worked operation. If the source uses different units, quoting, nesting, timing or account rules, a plausible-looking CI Cache Savings output is not sufficient validation.

Assumptions attached to CI Cache Savings

• CI Cache Savings assumes that all inputs describe the same unit or reporting period unless the field explicitly says otherwise.
• CI Cache Savings assumes that the model includes only the four visible inputs and does not infer hidden platform charges.

If one of these CI Cache Savings assumptions is false, keep the result as a diagnostic rather than production or decision data, and choose an implementation that explicitly supports the missing rule.

Evidence maintained for CI Cache Savings

The recorded reference is AWS Well-Architected — cost optimization. Reopen that source when the definition, format, fee or policy behind CI Cache Savings changes; private configuration and downstream acceptance still have to be checked in the user's own system.

Where CI Cache Savings runs

The named operation executes in browser JavaScript without an ecech calculation API. For CI Cache Savings, local execution reduces transmission but does not control browser extensions, device security or the destination where the result is pasted, so sensitive inputs still require the user's normal handling rules.