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Shipping cost calculatorWhat will it cost to ship?

Enter the packed weight and your zone. See USPS Ground Advantage and Priority Mail prices, and what Poshmark, Mercari, Whatnot, eBay, Depop and Etsy labels cost, then use the number in a fee calculator.

Prices checked US domestic · sources linked below
Packed weight
Where it's going

Not sure? Look up your exact zone on the USPS zone chart.

Box size (optional)
Box size in inches

Adds cubic prices, dimensional weight and big-box fees. Leave blank for an envelope or small box.

Calculating…

Use this in the calculator

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See the details

The USPS rules and platform label prices behind every number, with the official page for each.

USPS rules we use

USPS lists these as time-limited prices, starting October 4, 2026 through January 17, 2027. They include USPS's temporary 2026 increase on Priority Mail and Ground Advantage, so prices are expected to change after that. (USPS Price Change page: Time-Limited 2026 Price Change)

Weight rounding

Dimensional weight

Parcels over 1 cubic foot (1,728 cubic inches) pay for the actual weight or the dimensional weight, whichever is greater. Dimensional weight: round each side up to the next whole inch, multiply length x width x height, divide by 139 and round up to the next pound. A dimensional weight over 70 lb pays the 70 lb price. The divisor is 139. (USPS DMM 133: Ground Advantage retail prices, rounding and dimensional weight, USPS DMM 123: Priority Mail retail prices, rounding and dimensional weight)

Cubic pricing

Cubic prices are commercial only, for parcels up to 20 lb with no side over 22 inches: up to 0.5 cubic foot for Priority Mail and 1 cubic foot for Ground Advantage. Round each side down to the nearest 1/4 inch, multiply, divide by 1,728, and use the next tier up (0.1, 0.2, ...). Rolls and tubes don't qualify. (USPS DMM 283: Ground Advantage commercial and cubic prices, USPS DMM 223: Priority Mail commercial and cubic prices)

Big boxes

Retail vs commercial

Zones

Your zone is set by the distance between the 3-digit ZIP areas you ship from and to (USPS DMM 608 9.4.2: how postal zones are defined). The bands are approximate, so look up your exact zone on the USPS Domestic Zone Chart (look up your exact zone).

USPS zones (approximate distances)
ZoneDistance
1same 3-digit ZIP area, or up to 50 miles
2up to about 150 miles
3up to about 300 miles
4up to about 600 miles
5up to about 1,000 miles
6up to about 1,400 miles
7up to about 1,800 miles
8farther than about 1,800 miles
9Palau, Micronesia or the Marshall Islands

Priority Mail Flat Rate

Flat Rate prices, any zone (from October 4, 2026)
Box or envelopePost OfficeOnline
Small Flat Rate Box$14.65$12.95
Medium Flat Rate Box$25.80$22.02
Large Flat Rate Box$36.10$32.75
Flat Rate Envelope$13.90$11.97
Padded Flat Rate Envelope$15.00$12.84
Platform labels

Poshmark

One flat-rate USPS Ground Advantage label, paid by the buyer, for packages up to 5 lb. Heavier packages need an upgraded label; the upgrade comes out of your earnings.

Mercari

Prepaid labels at one price nationwide, by the label weight you pick. The buyer or you pays, depending on your listing. Best rate applies when the box is 1 cubic foot or less and its longest side is 22 inches or less; otherwise the Standard rate applies (also when you enter no dimensions).

Whatnot

The buyer pays shipping at checkout unless you offer free or reduced shipping. Ground Advantage is the default: under 1 lb is priced by weight, 1 to 5 lb is one price, over 5 lb depends on weight and distance.

eBay

Buy a label on eBay after the sale (eBay Labels): enter weight and size, pick USPS, UPS or FedEx. eBay says its labels save over retail prices but doesn't publish a price list, so you see the price when you buy the label.

  • eBay standard envelope: $0.78 for 1 oz, $1.07 for 2 oz, $1.36 for 3 oz, with tracking, in eligible categories (such as trading cards, coins and currency, stamps, postcards, patches, stickers, greeting cards and seeds). (eBay Seller Center: eBay standard envelope)
  • The envelope must be flexible, no heavier than 3 oz, no thicker than 1/4 inch, and between 3.5 x 5 and 6.125 x 11.5 inches. (eBay Seller Center: eBay standard envelope)

Depop

With Depop Shipping, Depop makes a prepaid, tracked USPS label after the sale. The parcel size you choose in your listing sets the shipping cost. Depop's help pages don't publish a price list, so see the price in your listing.

Etsy

Buy USPS labels in your Etsy shop. The cost depends on origin, destination, weight and size, and you may get discounted rates. You preview the price after you enter the package details.

Poshmark's $6.49 standard label is from Poshmark Blog: Lower shipping starting September 12th (Sept 8, 2025); its Feb 2026 post says the standard label is unchanged (Poshmark Blog: Shipping heavier items is now simpler and cheaper (Feb 13, 2026)). Poshmark has no single price page, so check the label price shown in the app. The Poshmark fee calculator doesn't include upgrade fees.

What we assume
  • We never make up a price. If a platform doesn't publish its label prices (eBay Labels, Depop, Etsy), we say "see at checkout".
  • USPS prices are the official Notice 123 prices from October 4, 2026 to January 17, 2027: Post Office (retail) and online label (commercial) prices. Label sites and marketplaces may offer other discounts.
  • Domestic US packages only. No insurance, signature or other extras.
  • We can't work out your zone from ZIP codes offline (USPS's chart has many exceptions), so pick a zone or enter the distance.
  • Platform labels only work when you sell on that platform, so they aren't a ship-it-yourself option.
Sources

All prices checked on . USPS prices effective through (USPS price file final 2026-09-14). Mercari prices effective .