eBay fee calculator
US most categories 13.6% to $7,500 then 2.35%, plus per-order fee. Forward and reverse.
CopiedFAQ
What rate is this? US most-categories non-Store: 13.6% of total up to $7,500 then 2.35%, plus per-order $0.30 if total is $10 or less else $0.40. Store subscribers and some categories differ. Official table is account-gated. Source: eBay selling fees help.
What is reverse calculation? If you need to take home a set amount, it solves for the charge that leaves that amount after the fee.
Does this talk to eBay? No. It uses a small rate file. Nothing is sent to eBay.