USPS Shipping Cost Calculator
Compare USPS Ground Advantage, Priority Mail and Priority Mail Express prices by ZIP code, weight and box size. See commercial and retail prices side by side, using the current USPS price list effective October 4, 2026.
Estimate USPS Postage by ZIP Code
How to Use the USPS Shipping Cost Calculator
Get a USPS price estimate in under a minute:
- 01
Enter both ZIP codes
Add the ZIP code you ship from and the one you're shipping to. The calculator estimates the USPS zone from the distance between them.
- 02
Add weight and box size
Enter the package weight. Add the box dimensions too, since USPS charges by dimensional weight for boxes over one cubic foot.
- 03
Compare services
See commercial and retail prices for Ground Advantage, Priority Mail and Priority Mail Express, with the lowest price marked.
- 04
Ship for less
Shipping at volume? Book a call to see what your orders would cost with Atomix's discounted carrier rates.
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How USPS Shipping Costs Are Calculated
Zones: Distance Sets the Price
USPS groups destinations into Zones 1 through 9 based on the distance between the origin and destination ZIP codes. Zone 1 covers local deliveries within about 50 miles, and Zone 8 covers 1,800 miles or more. Each step up in zone raises the price. To see how distance also affects delivery speed, try our Shipping Transit Time Calculator.
Weight and Dimensional Weight
USPS prices parcels by the pound and rounds up to the next pound, though Ground Advantage also has 4, 8, 12 and 15.99 oz tiers. For boxes larger than one cubic foot, USPS charges the greater of the actual weight or the dimensional weight: length × width × height divided by 139. Boxes longer than 22 inches or larger than two cubic feet also pay a nonstandard fee.
Commercial vs. Retail Prices
Retail prices apply when you pay at a Post Office counter. Commercial prices apply to labels bought online through USPS Click-N-Ship, shipping software or a fulfillment partner, and they're lower for every service. High-volume shippers and 3PLs can negotiate rates below the published commercial prices.
Cutting USPS Costs With Closer Inventory
Atomix runs fulfillment centers in Milwaukee, Baltimore, and Salt Lake City. Shipping each order from the warehouse closest to the customer keeps more packages in Zones 1 to 4, where USPS prices are lowest, and Atomix clients get discounted USPS, UPS and FedEx rates on top of that.
2026 Holiday Price Change
USPS raised Priority Mail Express, Priority Mail and Ground Advantage prices temporarily for the 2026 holiday season, from October 4, 2026 through January 17, 2027. This calculator uses the current USPS price list, so the increase is already included. Expect prices to change again after January 17.
USPS Shipping Cost Calculator FAQs
How accurate is this USPS shipping calculator?
Prices come directly from the USPS Notice 123 price list effective October 4, 2026. The zone is estimated from the two ZIP codes and matches the official USPS zone chart for more than 99% of ZIP code pairs. Extra services like insurance, signature confirmation and Sunday delivery aren't included, so confirm the final price when you buy a label.
What's the difference between commercial and retail USPS prices?
Retail prices are what you pay at the Post Office counter. Commercial prices are what you pay when you buy labels online or through shipping software. Commercial prices are lower for every service, and Ground Advantage commercial prices often run 20% or more below retail.
When does the USPS holiday price increase end?
The temporary increase runs through January 17, 2027. Planning around holiday delivery? See what time USPS stops delivering before you set your cutoffs.
How can my business pay less than USPS commercial prices?
Ship from closer to your customers and work with a partner that has negotiated carrier rates. Upload your order history to our free Order History Analyzer to see your zone mix and what your orders would cost to ship from Atomix.
Get discounted USPS, UPS and FedEx rates
Atomix fulfills orders from three U.S. warehouses with discounted carrier rates. Book a call and we'll price your actual orders.
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