how to figure shipping on ebay involves using eBay’s built-in tools to calculate shipping costs based on package size, weight, and destination. eBay offers a shipping calculator that helps sellers estimate shipping fees for different shipping methods, such as USPS, UPS, or FedEx. Sellers can either charge customers a flat rate for shipping or calculate actual shipping costs based on the buyer’s location. By offering accurate shipping rates, sellers can ensure that they remain competitive and transparent with their customers.