Code Review Time Estimator
Estimate code review time based on lines of code changed, code complexity, and number of reviewers.
Results
What is it?
For informational/educational purposes only. Code review time estimates help engineering teams plan sprints and set realistic expectations for PR turnaround. Research suggests reviewers can effectively review about 60-100 lines of medium-complexity code per hour.
How to use
Enter the total lines changed in the pull request, select the complexity level, and choose the number of reviewers. The calculator estimates individual reviewer time and total cycle time including two rounds of review (initial + addressing comments).
Example scenario
A 500-line PR of medium complexity with 2 reviewers. Per reviewer: 500/60 � 60 = 500 minutes = 8.3 hours. Total cycle time (2 rounds � 2 reviewers) = 33.3 hours = 1.4 business days.
Pro tip
Keep PRs under 400 lines for faster, higher-quality reviews. Larger PRs get rubber-stamped more often. Use draft PRs for early feedback, atomic commits for context, and PR templates with description/test plan fields to reduce reviewer cognitive load.