Code Review Time Calculator
Review hours from lines changed.
Enter your values
ⓘ Live results
Results
- Review hours per reviewer
- 2.83
- Total team hours
- 5.67
- Expected defects
- 10.2
- PR size verdict
- Too large — split it
Quick answer
Effective code review runs at 200–400 lines per hour; faster reviews miss defects.
Hours = lines ÷ review rate
How to use the Code Review Time Calculator
- 1Enter lines changed in the pull request.
- 2Set your team's review rate.
- 3Enter how many reviewers are assigned.
Worked example
Using the values the calculator loads with:
Inputs
- Lines changed850
- Review rate300 lines/hour
- Reviewers2
- Defects per KLOC12
Results
- Review hours per reviewer2.83
- Total team hours5.67
- Expected defects10.2
- PR size verdictToo large — split it
Frequently asked questions
What PR size is ideal?
Under 400 lines — defect detection collapses beyond that.
Do two reviewers double detection?
No, the second reviewer adds far less than the first.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.