Understanding Change Failure Rate
How we calculate. CFR % = (failed production changes ÷ total production changes) × 100. The form uses the same arithmetic as the worked examples on this page. See our methodology and accuracy policy.
Real-world scenario: A typical Change Failure Rate case uses failed changes 6 and total changes 80. Enter the same figures below to reproduce the worked path.
What is Change Failure Rate?
A DORA quality metric. Define “failure” consistently (rollback, SEV, hotfix within window).
- Same change count as your deployment definition
- Failed = incident/rollback/hotfix per policy
- Lower is better when quality is the goal
The Formula
Worked Example
Common Use Cases
- Release quality: post-mortems trends
- DORA dashboards: stability vs speed
- Service compare: which apps hurt CFR
Pro Tips
- Don’t hide hotfixes outside the count
- Segment by risk tier
- Pair with MTTR
Limitations: Change Failure Rate results are educational DevOps/FinOps planning aids—not SLAs or billing guarantees. Confirm definitions with your platform and finance policies.
FAQ
Is every bug a failed change?
Usually only changes that require remediation (rollback/hotfix/incident) within your defined window.
What if total changes is 0?
CFR is undefined until you have at least one change.
Authoritative References
For DORA and FinOps definitions, consult:
- DORA — Four Keys research and definitions
- Google SRE books — SLOs and error budgets
- FinOps Foundation — cloud cost practices