How to Calculate Code Coverage

What is Code Coverage?

A code coverage calculator determines the percentage of codebase lines, branches, or functions executed by tests. Coverage = (tested lines ÷ total lines) × 100. Most teams target 70–80% coverage; 100% coverage is neither practical nor sufficient for quality assurance.

Step-by-Step Guide

1Identify shortcuts and workarounds
2Estimate refactoring effort
3Calculate opportunity cost

Worked Examples

Input

10 days refactoring to reduce by 20%

Result

Estimated 2 day/quarter savings

Varies by complexity

Common Mistakes to Avoid

✕Wrong parameters
✕Missing adjustments

Frequently Asked Questions

What does this calculator do?

Set parameters

How do I use this calculator?

Run calculation

Ready to calculate? Try the free Code Coverage Calculator

Try it yourself →