Terms of Use

By using Net Margin Lab you agree to these terms. If you do not agree with them, please do not use the site.

1. What this site provides

Net Margin Lab provides free calculators that estimate marketplace fees, profit and import costs. The calculators are planning aids. They produce estimates based on published fee schedules and on the inputs you supply.

2. Estimates, not advice

The results are estimates. They are not financial, accounting, tax, legal or customs advice, and they are not a quotation. Fee schedules vary by marketplace, category, seller status, account standing and date, and customs treatment depends on the classification, origin and circumstances of the specific goods. You are responsible for confirming any figure against the authoritative source — your seller dashboard, the marketplace's published schedule, or a licensed customs broker — before acting on it.

3. No warranty

The site and its calculators are provided "as is" and "as available", without warranties of any kind, express or implied, including any implied warranty of accuracy, fitness for a particular purpose or non-infringement. We do not warrant that the site will be uninterrupted, error-free, or that any rate shown is current.

4. Limitation of liability

To the fullest extent permitted by law, Net Margin Lab and its operators are not liable for any loss or damage arising from use of, or reliance on, this site or its calculators — including lost profit, lost sales, mispriced inventory, or costs incurred with a supplier, marketplace or customs authority. You use the output at your own risk.

5. Acceptable use

You may use the calculators for your own business or personal purposes. You may not attempt to disrupt the site, scrape it at volume, republish it as your own, or use it in a way that breaches applicable law.

6. Trademarks

Amazon, Fulfilment by Amazon, Etsy, eBay, Walmart, Google and other names are trademarks of their respective owners. They are used on this site only to describe what is being calculated. Net Margin Lab is not affiliated with, endorsed by or sponsored by any of them.

7. Advertising

This site displays third-party advertising. Advertisers do not influence the calculators, the rates used, or the editorial content of any page. See the privacy policy for how advertising cookies work.

8. Changes

These terms and the calculators may change at any time. Continued use of the site after a change means you accept the revised terms.

9. Contact

Questions about these terms can be sent to [email protected].