What Is a Good Code Coverage Percentage, and What’s Considered Acceptable?

A good code coverage percentage typically falls between 75% and 85%, striking a balance between test effectiveness and development effort. While 100% code coverage might seem ideal, it is rarely practical and often leads to diminishing returns.

80%: The Common Benchmark

Most development teams and QA experts consider 80% code coverage a realistic and effective target. It offers strong confidence in the software’s reliability without requiring excessive resources.

Acceptable Code Coverage Varies by Project

• 75–85%:

This range is often seen in mature projects with solid test practices.

• Above 90%:

Needed in high-stakes environments, think healthcare, banking, or aerospace.

• Below 75%:

Might be okay for early prototypes or smaller projects but should be revisited as the project grows.

It’s Not Just About the Number

A high coverage percentage doesn’t always mean your tests are effective. You could technically cover 90% of your code but still miss critical bugs if the tests aren’t well written. What matters more is how well your tests reflect real-world scenarios and cover edge cases.