Privacy & product information

Updated 10 September 2026.

Your calculator entries

The calculator runs on your device. We do not upload, collect or store the numbers you enter. Entries are held in the current tab and reset on reload. No account is required by the calculator.

Website requests

The hosting provider may process normal technical information, including IP addresses and request logs, to deliver and protect the site. This website is hosted by Cloudflare Pages. This site adds no advertising cookies, analytics trackers, external fonts or embedded social widgets.

Printing

Printing and saving a PDF use your browser. Store printed or downloaded business information somewhere you trust.

Product availability

The Market Margin workbook costs $19 USD as a one-time download, with applicable taxes shown at checkout. Purchases and file delivery are handled by Gumroad. Its privacy policy applies when you visit the store or purchase. This calculator site does not receive your payment card details. A 14-day money-back guarantee applies. For support or refund requests, contact marketmargin@proton.me. You may use and adapt the workbook for your own business; redistribution and resale are not included.

Calculation limits

This is an estimate based on your inputs. It does not predict attendance, customer demand, tax liabilities or business success. It is not bookkeeping or tax software. Use one currency consistently and verify costs and fees for your own situation.

Workbook format

The product is an Excel .xlsx workbook with formulas and no macros. Compatibility with other spreadsheet applications is not promised unless specifically tested. The free worked example can be read without spreadsheet software.