Function points can be calculated by

Answer: Function Points = UFP × CAF

Definitions:

• UFP (Unadjusted Function Points): sum of weighted counts of the five function types — external inputs, external outputs, external inquiries, internal logical files, and external interface files.

• CAF (Complexity Adjustment Factor or Value Adjustment Factor): computed as 0.65 + 0.01 × (sum of ratings for 14 general system characteristics, each rated 0–5).

How to compute the final Function Points:

1. Count and weight the function types to get UFP.

2. Rate the 14 general system characteristics, sum their ratings, and compute CAF = 0.65 + 0.01 × (sum of ratings).

3. Multiply: Function Points = UFP × CAF. This gives the adjusted Function Point count used for sizing and estimation.