What the calculation measures
Work backward from target margin rather than applying a markup that ignores payment or marketplace fees.
How to interpret the result
Run scenarios for fees and cost increases to understand pricing sensitivity.
Run scenarios instead of one answer
Change the most uncertain input and compare outcomes. A calculator is most useful when it shows sensitivity, not when one estimate is treated as a guarantee.
Limits and assumptions
Competitor pricing, taxes, shipping and customer willingness to pay still require separate judgment.