# COCOMO II Effort and Schedule Calculator

> Estimate development effort, schedule and average team size for a software project of a known size.

Page: https://freecalculator.tech/tools/cocomo-ii-estimate-calculator
Last reviewed: 2026-09-15

## Formula

E = A × Size^(B + 0.01 × ΣSF) × EM; TDEV = C × E^(D + 0.2 × (B_exponent − B)); Team = E ÷ TDEV, with A = 2.94, B = 0.91, C = 3.67, D = 0.28

- E = A × Size^(B + 0.01 × ΣSF) × EM; TDEV = C × E^(D + 0.2 × (B_exponent − B)); Team = E ÷ TDEV, with A = 2.94, B = 0.91, C = 3.67, D = 0.28.
- Inputs used: Size, Sum of the five scale factors, Product of the effort multipliers.
- Edge handling: Size is required.; Size must be greater than zero.; Size must be no more than 100000.; Sum of the five scale factors is required.; Sum of the five scale factors cannot be negative..

## Inputs

- Size
- Sum of the five scale factors
- Product of the effort multipliers

## Worked example: 100 KSLOC project at nominal ratings

Published COCOMO II post-architecture constants applied to your ratings.
1. Start with Size: 100, Sum of the five scale factors: 18.97, Product of the effort multipliers: 1.
2. Apply the method: E = A × Size^(B + 0.01 × ΣSF) × EM; TDEV = C × E^(D + 0.2 × (B_exponent − B)); Team = E ÷ TDEV, with A = 2.94, B = 0.91, C = 3.67, D = 0.28.
3. Published COCOMO II post-architecture constants applied to your ratings.

## Common questions

### Where does this formula come from?

COCOMO II model definition manual, post-architecture effort and schedule equations with published constants. See the source link on this page.

### What kind of calculation is this?

The published post-architecture equations: effort in person-months from size in thousands of source lines, then schedule from effort. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

An estimation model, not a measurement. Accuracy depends entirely on the size estimate and ratings supplied.

### How do I use the COCOMO II Effort and Schedule Calculator?

Enter the required values for Size, Sum of the five scale factors, Product of the effort multipliers. 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 COCOMO II Effort and Schedule Calculator use?

E = A × Size^(B + 0.01 × ΣSF) × EM; TDEV = C × E^(D + 0.2 × (B_exponent − B)); Team = E ÷ TDEV, with A = 2.94, B = 0.91, C = 3.67, D = 0.28 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. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the COCOMO II Effort and Schedule 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 cocomo ii effort and schedule calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- SEI / USC — https://csse.usc.edu/tools/cocomo/

## Cite this page

- APA: Free Calculator. (2026, September 15). COCOMO II Effort and Schedule Calculator. https://freecalculator.tech/tools/cocomo-ii-estimate-calculator
- MLA: "COCOMO II Effort and Schedule Calculator." Free Calculator, 15 Sept. 2026, https://freecalculator.tech/tools/cocomo-ii-estimate-calculator.
- Link: COCOMO II Effort and Schedule Calculator — Free Calculator, https://freecalculator.tech/tools/cocomo-ii-estimate-calculator