Contact
Contact RotoCurve
Questions, corrections, calculator requests, and feedback are welcome.
Please include the page URL, what number or assumption looks wrong, and any official source that should be checked.
Good reasons to reach out
- A marketplace fee or carrier assumption changed.
- A calculator needs an extra input.
- A page has unclear wording or a broken link.
- You want a new seller, shipping, savings, or business math calculator.
Quality and usage notes
This page is intended to help users make clearer planning decisions with transparent assumptions. Results are estimates and should be checked against official sources when money, taxes, shipping, or marketplace rules are involved.
How to use this page well
Use this page as a planning aid, not a final quote or official rule. Replace defaults with your own numbers, compare more than one scenario, and check any important fee, tax, carrier, or marketplace policy against the official source before acting.
- Use real costs instead of rounded guesses whenever possible.
- Review the result together with shipping, returns, discounts, taxes, and payment fees.
- Save or repeat the calculation when costs change, because small inputs can change profit quickly.