How to use this calculator
- Enter unit cost and fulfillment, fixed transaction fee, percentage selling fee (%), target contribution margin (%).
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Fee plus target margin must be below 100%. The cost basis must include every expense you intend to recover.
Worked example
With unit cost and fulfillment = 60, fixed transaction fee = 2, percentage selling fee (%) = 10, target contribution margin (%) = 20, required selling price is approximately 88.571429.
What the result means
The margin is defined on the final selling price, not on cost.
Common questions
How should I interpret required selling price?
The margin is defined on the final selling price, not on cost.
What should I check before using this result?
Fee plus target margin must be below 100%. The cost basis must include every expense you intend to recover.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.