Refactoring Effort
Estimate the time to refactor code and backfill tests.
About Refactoring Effort
Refactoring time scales with the code size, and any lines lacking test coverage add time to write the missing tests. Tech debt is only 'cheap' before it accrues; estimating the refactoring and test cost makes the investment concrete and comparable.
Formula
Refactoring Effort
Hours = lines/100 x minutes / 60 + uncovered lines x 0.5 min / 60
- uncovered
- Code without automated tests that needs them written
Worked example
With the default values below, Refactoring Effort returns Manual Refactor Hours of 1.67. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Lines of codeminimum 0
- 2,000
- Minutes per 100 linesminimum 0
- 5
- Test coverageaccepts 0–100 %
- 70 %
Results
- Manual Refactor Hours
- 1.67
- Test Write Hours
- 5.00
- Total Hours
- 6.67
- Person-Days
- 0.8
Step by step
- 1Values used
- 2Refactoring Effort
- 3Manual Refactor Hours= 1.67
- 4Test Write Hours= 5.00
- 5Total Hours= 6.67
- 6Person-Days= 0.8
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Refactoring Effort calculated?
Hours = lines/100 x minutes / 60 + uncovered lines x 0.5 min / 60 Refactoring time scales with the code size, and any lines lacking test coverage add time to write the missing tests.
Why does Refactoring Effort matter?
Tech debt is only 'cheap' before it accrues; estimating the refactoring and test cost makes the investment concrete and comparable.
What values do I need to enter?
This calculator takes 3 inputs: Lines of code, Minutes per 100 lines, Test coverage. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.