# Function Point Effort Calculator

> Turn a function point count into effort using your own delivery rate.

Page: https://freecalculator.tech/tools/function-point-effort-calculator
Last reviewed: 2026-09-16

## Formula

Effort hours = Function points × Your hours per function point; Person-months = Effort hours ÷ Hours per person-month

- Effort hours = Function points × Your hours per function point; Person-months = Effort hours ÷ Hours per person-month.
- Inputs used: Function points to build, Your own hours per function point, Hours in one person-month.
- Edge handling: Function points to build is required.; Function points to build cannot be negative.; Function points to build must be no more than 1000000000.; Your own hours per function point is required.; Your own hours per function point cannot be negative..

## Inputs

- Function points to build
- Your own hours per function point
- Hours in one person-month

## Worked example: 480 function points at your own 13 hours per point

The delivery rate comes from your own history, so the estimate stays yours.
1. Start with Function points to build: 480, Your own hours per function point: 13, Hours in one person-month: 152.
2. Apply the method: Effort hours = Function points × Your hours per function point; Person-months = Effort hours ÷ Hours per person-month.
3. The delivery rate comes from your own history, so the estimate stays yours.

## Common questions

### Where does this formula come from?

IFPUG, Function Point Counting Practices Manual — functional size is counted independently of technology, and delivery rate is effort per unit of functional size. See the source link on this page.

### What kind of calculation is this?

Functional size is multiplied by the organisation's own measured delivery rate. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

An estimate, not a commitment; accuracy depends entirely on the delivery rate entered. Does not model schedule or team size.

### How do I use the Function Point Effort Calculator?

Enter the required values for Function points to build, Your own hours per function point, Hours in one person-month. 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 Function Point Effort Calculator use?

Effort hours = Function points × Your hours per function point; Person-months = Effort hours ÷ Hours per person-month 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 Function Point Effort 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 function point effort calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- International Function Point Users Group — https://www.ifpug.org/ifpug-standards/

## Cite this page

- APA: Free Calculator. (2026, September 16). Function Point Effort Calculator. https://freecalculator.tech/tools/function-point-effort-calculator
- MLA: "Function Point Effort Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/function-point-effort-calculator.
- Link: Function Point Effort Calculator — Free Calculator, https://freecalculator.tech/tools/function-point-effort-calculator