Reseller Shipping Calculator

For most reseller packages under a few pounds it is USPS Ground Advantage bought online at commercial prices. Heavy items in a small mailer are often cheaper with Ground Advantage cubic pricing, dense items going cross-country can be cheaper in a Priority Mail Flat Rate Envelope, and books and media are cheapest by Media Mail. The calculator above prices all of them for your package and sorts them.

At USPS commercial prices effective July 12, 2026, a 1 lb Ground Advantage package costs $7.61 to zone 1 and $10.67 to zone 8. Anything from 4 oz up to 15.999 oz costs $6.93 to $8.40, so staying under 1 lb saves up to $2.27.

Zones measure how far a package travels, from zone 1 (local) to zone 8 (cross-country); zone 9 covers US territories. Enter your ZIP and the buyer’s ZIP above and we ask USPS’s own zone lookup, or use the USPS zone chart at postcalc.usps.com. If you don’t know the buyer yet, each price shows the range across zones 1–8.

Only when a parcel is bigger than 1 cubic foot (1,728 cubic inches). USPS rounds each side up to the whole inch, multiplies length × width × height and divides by 139, rounding up, and charges the higher of that and the actual weight. Poly mailers almost never hit it; big boxes with light items do.

A commercial USPS price based on package size instead of weight, for packages up to 20 lb with no side over 22 inches. Ground Advantage cubic goes up to 1 cubic foot in ten tiers and Priority Mail cubic to 0.5 cubic foot. Poly mailers are tiered by length + width. It is sold through label services (PC Postage) that offer it, not at the Post Office.

They are USPS’s published commercial prices. Marketplaces and label services with negotiated rates can charge less, and each one shows its own price when you buy. Poshmark publishes its label prices, so we show those exactly; Mercari, Depop, eBay, Etsy and Vinted price labels in their own tools, so we link to them.