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Git Diff Stat Calculator
Calculate lines added/removed from git diff output.
Method: standard formula Developer
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Git Diff Stat Calculator parses unified diff text from `git diff`, patch files, GitHub, or code review tools to count files changed, lines added, lines removed, and per-file change totals. Use it when a pull request needs a quick size summary, a release note needs change volume, or a reviewer wants to separate small edits from broad churn. The tool counts diff markers client-side and ignores file header markers such as `+++` and `---` when tallying additions and deletions. Treat the result as review context rather than code quality measurement.
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Input Pattern
Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.
How to use this tool
Copy unified diff output from `git diff`, a patch file, or a review tool.
Paste it into the diff input field and click "Analyze".
Review files changed, lines added, lines removed, total changes, and the per-file breakdown.
Use the numbers in a PR description, release note, review handoff, or change-risk discussion.
Formula or method
Lines beginning with `+` count as additions unless they are file header lines beginning with `+++`.
Lines beginning with `-` count as deletions unless they are file header lines beginning with `---`.
File names are detected from standard `diff --git` and `+++ b/path` style diff headers.
Worked example
Summarizing a pull request before review
Unified diff output from `git diff main...feature`
Result: The calculator reports total files changed, additions, removals, total changed lines, and a file-by-file breakdown.
Use the summary to flag broad churn, identify the largest files, or decide whether the review should be split.
How to interpret the result
Diff statistics describe change size, not whether a change is correct or risky.
Large additions can indicate new functionality, generated files, fixtures, or verbose snapshots.
Large deletions can be simplification, cleanup, or accidental removal; inspect the files before judging.
File-level totals help reviewers find concentrated changes and possible split points.
Common mistakes
Treating changed-line count as a quality score.
Including generated lockfiles, snapshots, or build outputs without noting them separately.
Comparing diffs produced with different whitespace or rename settings.
Sharing stats without the branch range or command used to generate the diff.
Review note and limitations
Method - client-side unified diff marker counting with per-file aggregation.
Does not understand semantic code risk, test coverage, renames, binary file changes, or generated-code intent.
Depends on standard unified diff text; unusual patch formats may produce incomplete file breakdowns.
Code review support only. Inspect the actual diff, tests, generated files, and business context before approving changes.
FAQ
Can I paste output from GitHub or a patch file?
Yes, as long as the text is in unified diff format with standard added and removed line markers.
Does this count `+++` and `---` header lines?
No. The calculator excludes standard file header markers from addition and deletion counts.
Do more changed lines mean a riskier PR?
Not always. Diff size is one signal; generated files, tests, refactors, deleted code, and business impact all change the review risk.
Explore more versions
Tailored guides for specific audiences, regions, and scenarios.
Related tools and workflows
Diff stats pair with JSON diff, text diff, hash generation, environment variable cleanup, and API response formatting in code review workflows.