Calculate cost per line of code, total cost, or lines of code from any two values for software development projects.
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Cost Per Line of Code Formula
The cost per line of code is the total project cost divided by the number of lines of code produced. The calculator can also rearrange the formula to solve for total cost or lines of code.
- CPLC = cost per line of code, in dollars per line
- TC = total cost, in dollars
- LOC = number of lines of code
If you enter total cost and lines of code, the calculator finds the cost per line of code. If you enter lines of code and cost per line, it finds the total cost. If you enter total cost and cost per line, it finds the estimated number of lines of code.
Common Inputs for Cost Per Line Estimates
Cost per line of code can vary widely because a line of code is not a fixed unit of effort. The table below gives general context for interpreting the result.
| Situation | Typical Interpretation | Notes |
|---|---|---|
| Simple scripts or small internal tools | Lower cost per line | Usually less planning, testing, and documentation |
| Business applications | Moderate cost per line | Includes requirements, testing, UI work, and maintenance planning |
| Complex, regulated, or safety-critical systems | Higher cost per line | More review, verification, security, compliance, and documentation |
What to Include in Total Cost
| Cost Item | Include? | Why It Matters |
|---|---|---|
| Developer labor | Yes | Usually the largest part of the cost |
| Testing and QA | Yes | Code that is tested often costs more but is more reliable |
| Project management | Usually | Adds overhead that should be counted in full project cost |
| Maintenance after launch | Only if part of the estimate period | Including it will raise the calculated cost per line |
Example Calculations
Example 1: Calculate cost per line of code
You spent $25,000 to produce 10,000 lines of code.
The cost per line of code is $2.50 per line.
Example 2: Calculate total cost
A project has 18,000 lines of code and a cost per line of $4.25.
The total cost is $76,500.
FAQ
Is cost per line of code a good way to measure software cost?
It can be useful for rough comparisons, but it should not be the only measure you use. Lines of code do not always reflect difficulty, quality, performance, or maintainability. A short piece of code can take a long time if it solves a difficult problem, while many simple lines may be produced quickly.
Should blank lines and comments be included in lines of code?
Use the same counting method throughout your calculation. For most cost comparisons, it is better to use source lines of code that exclude blank lines and sometimes exclude comments. If comments are a required deliverable, you may choose to include them, but be consistent.
Why does the calculator require exactly two values?
The formulas have three variables: total cost, lines of code, and cost per line. Any two values are enough to calculate the third. If you enter fewer or more than two values, the calculator cannot determine which variable you want to solve for.
