Function Point Calculator

Function Point Calculation

Calculate function points from transaction and data functions

External Inputs (Low complexity)

External Inputs (Average)

External Inputs (High)

External Outputs (Low)

External Outputs (Average)

External Outputs (High)

External Queries (Low)

External Queries (Average)

External Queries (High)

Internal Logical Files (Low)

Internal Logical Files (Avg)

Internal Logical Files (High)

External Interface Files (Low)

External Interface Files (Avg)

External Interface Files (High)

FP to Effort Conversion

Convert function points to development effort

Function Points

Team Productivity

Team Size

Formula

UFP = Sum(Count x Weight) for all function types | Effort = UFP x Hours/FP | Duration = Effort / Team Size

Frequently Asked Questions

What are function points?

Function points measure software size based on functionality delivered to users, independent of technology. They count five types: External Inputs (data entry), External Outputs (reports), External Queries (lookups), Internal Logical Files (data stores), and External Interface Files (shared data). Each is weighted by complexity (low/average/high).

How accurate is function point estimation?

Function point estimation is typically within 20-25% accuracy for experienced estimators. It is more reliable than lines-of-code estimation because it is independent of programming language. Accuracy improves with historical calibration data from your own organization.

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