# KSLOC Calculator

> Size software in thousands of source lines, counted or converted.

Page: https://freecalculator.tech/tools/ksloc-calculator
Last reviewed: 2026-09-16

## Formula

Line count method: KSLOC = SLOC ÷ 1000. Conversion method: KSLOC = (Function points × Your lines per function point) ÷ 1000

- Line count method: KSLOC = SLOC ÷ 1000. Conversion method: KSLOC = (Function points × Your lines per function point) ÷ 1000.
- Inputs used: Sizing method, Source lines of code, Function points, Your own lines of code per function point.
- Edge handling: Source lines of code is required.; Source lines of code cannot be negative.; Source lines of code must be no more than 1000000000.; Function points is required.; Function points cannot be negative..

## Inputs

- Sizing method
- Source lines of code
- Function points
- Your own lines of code per function point

## Worked example: 128,400 source lines

A straight line count; the conversion method stays a separate choice.
1. Start with Sizing method: sloc, Source lines of code: 128400, Function points: 0, Your own lines of code per function point: 0.
2. Apply the method: Line count method: KSLOC = SLOC ÷ 1000. Conversion method: KSLOC = (Function points × Your lines per function point) ÷ 1000.
3. A straight line count; the conversion method stays a separate choice.

## Common questions

### Where does this formula come from?

COCOMO II Model Definition Manual — post-architecture effort PM = A × Size^E × ΠEM with A = 2.94 and E = B + 0.01 × ΣSF (B = 0.91), and schedule TDEV = C × PM^(D + 0.2 × (E − B)) × SCED%/100 with C = 3.67 and D = 0.28. See the source link on this page.

### What kind of calculation is this?

Size in thousands of source lines, by either of two published routes. The two routes are separate choices and are never combined.

### What are its limits?

Converted sizes inherit all the uncertainty of the conversion ratio. A size, not an effort or a cost.

### How do I use the KSLOC Calculator?

Enter the required values for Sizing method, Source lines of code, Function points, Your own lines of code per function point. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the KSLOC Calculator use?

Line count method: KSLOC = SLOC ÷ 1000. Conversion method: KSLOC = (Function points × Your lines per function point) ÷ 1000 The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.

### Can the KSLOC Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this ksloc calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- University of Southern California, Center for Systems and Software Engineering — https://csse.usc.edu/tools/cocomo/

## Cite this page

- APA: Free Calculator. (2026, September 16). KSLOC Calculator. https://freecalculator.tech/tools/ksloc-calculator
- MLA: "KSLOC Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/ksloc-calculator.
- Link: KSLOC Calculator — Free Calculator, https://freecalculator.tech/tools/ksloc-calculator