About Sellridge
Sellridge builds free calculators for people who sell products online and want to know what they actually keep.
The problem we keep seeing
Most sellers can tell you their revenue. Far fewer can tell you their profit per order, and almost none can tell you the ROAS at which their ads stop making money. Ad platforms report revenue and ROAS because that is what they are paid on. They do not know your product cost, your shipping, or your return rate — and they never will.
So the number that decides whether a campaign scales or quietly drains a business is the one number nobody hands you. That is the gap Sellridge exists to close.
How we build
- No signup, no paywall. Open the page and use it.
- Nothing stored. All calculations run in your browser. Your numbers are not sent anywhere.
- Show the formula. Every result can be reproduced by hand, because a number you cannot verify is a number you should not trust.
- Say what we are unsure about. Platform fee rates change. We label them as reference values and tell you to confirm.
What is coming
More calculators for the parts of ecommerce math that get skipped: landed cost, discount impact, subscription break-even, and fee comparisons across marketplaces. If a calculator would save you a spreadsheet, we probably want to build it.
Contact
Corrections, requests and bug reports are genuinely welcome — especially if a fee rate is out of date. Reach us at hello@sellridge.com.