Unit Economics Calculator — illustrative example

INPUT
An order earns USD 50 revenue and incurs USD 18 goods cost, USD 5 fulfillment and USD 2 payment fees.

RESULT
Contribution per order: 50 − 18 − 5 − 2 = USD 25.
Contribution margin: 50%.
Fixed overhead, returns and any unlisted variable costs are excluded.

REVIEW
Choose the unit and accounting boundary before calculating unit economics. Contribution calculations must identify which variable costs are included and which fixed costs remain outside the result.

This is a teaching example, not a live execution record.