Result
Amounts are in the currency you enter; rates are percentages.
This tool runs entirely in your browser. The values you enter are never sent to a server or stored.
How it works
The last digit of an EAN or UPC barcode is a check digit: the preceding digits are multiplied alternately by 3 and 1 from the right, summed, and the amount needed to reach the next multiple of ten becomes the check digit. Marketplaces reject a barcode with a wrong check digit or attach your product to the wrong listing, so validating before upload is the cheapest check.
Other tools
See it before we explain it.
We will send you login details for a working copy of the panel; explore it yourself, then let’s talk.