Understanding Code Review Coverage
How we calculate. Coverage % = reviewed PRs (or commits) ÷ total 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 Code Review Coverage case uses reviewed changes 95 and total changes 100. Enter the same figures below to reproduce the worked path.
What is Code Review Coverage?
Process-quality gate metric. 100% is common for protected branches; gaps often mean hotfix bypasses.
- Define change unit (PR preferred)
- Count required reviewers separately if needed
- Segment by repo
The Formula
Worked Example
Common Use Cases
- Branch protection audits: bypass rates
- Compliance: change control
- Team habits: review culture
Pro Tips
- Track emergency bypasses
- Measure review lag too
- Don’t equate coverage with review quality
Limitations: Code Review Coverage results are educational software estimation aids—not bids, contracts, or performance scores. Calibrate models to your organization’s history.
FAQ
Self-approvals count?
Only if your policy allows—many orgs exclude author-only approvals.
What if total changes is 0?
Coverage is undefined—no changes in the window.
Authoritative References
For estimation and quality models, consult:
- COCOMO — Constructive Cost Model overview
- IFPUG — function point standards
- SEI / Carnegie Mellon — software engineering practice