Function Point Calculator

A free tool to accurately estimate software development scale using the IFPUG Function Point method. Calculate UFP, VAF, and AFP to determine man-months. Works securely in your browser.

Unadjusted Function Points (UFP)

Count the number of data and transaction functions and rate their complexity (Low, Average, High).

External Inputs (EI)

External Inputs (EI) are processes that bring data into the application from the outside (e.g., user registration form, system configuration updates).

Low

Avg

High

External Outputs (EO)

External Outputs (EO) are processes that send data outside the application and usually involve calculations or derived data (e.g., monthly sales reports, payroll statements).

Low

Avg

High

External Inquiries (EQ)

External Inquiries (EQ) are processes that simply retrieve data and output it without any complex calculations (e.g., searching for a user, viewing inventory status).

Low

Avg

High

Internal Logical Files (ILF)

Internal Logical Files (ILF) are groups of logically related data maintained within the application boundary (e.g., user database tables, employee master data).

Low

Avg

High

External Interface Files (EIF)

External Interface Files (EIF) are groups of data maintained by a different application but referenced by this application (e.g., external zip code API, secondary system's user master).

Low

Avg

High

Value Adjustment Factor (VAF)

Rate the 14 General System Characteristics on a scale from 0 (Not present) to 5 (Strong influence).

1. Data Communications

How much data is communicated directly with the system?

2. Distributed Data Processing

How much distributed data and processing functions are required?

3. Performance

Are response time and throughput critical to the business?

4. Heavily Used Configuration

How heavily used is the current hardware platform where the application will run?

5. Transaction Rate

Is the transaction rate high and does it peak?

6. Online Data Entry

What percentage of the data is entered online?

7. End-User Efficiency

Was the application designed for maximum end-user efficiency (UI/UX)?

8. Online Update

How many of the internal logical files are updated online?

9. Complex Processing

Does the application entail extensive logical or mathematical processing?

10. Reusability

Was the application developed specifically to be reusable in other applications?

11. Installation Ease

How easy are conversion and installation requirements?

12. Operational Ease

How automated and easy is the operational startup, backup, and recovery?

13. Multiple Sites

Was the application specifically designed to be installed at multiple sites?

14. Facilitate Change

Was the application robustly designed to facilitate future modifications easily?

Calculation Results

Unadjusted FP (UFP)0

Adjustment Factor (VAF)0.65

Adjusted FP (AFP)0

Man-Month Estimate

~ 0 Months

* Calculated assuming 15 FP = 1 Man-Month. Actual productivity depends on team skill and language.

Export Report

Guide & Terminology

What is the Function Point Calculator?

It estimates the functional size of software based on logical design using the IFPUG methodology.

How to use

Input the number of logical files and transactions categorized by their complexity to compute the UFP, then select 14 system characteristics to get the Adjusted FP.

Security

Calculations are performed locally in your browser.

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