Stamps.com 2022 Rates

Details for Stamps.com 2022 rates for ShipStation users. Includes First Class, Priority Flat Rate, Regional Rate, and Priority Mail services.

USPS rates increase on January 9th, 2022. All USPS postage providers, including Stamps.com, must comply with these new rates. Listed below are some of the more common services that will see rate increases.

Below you'll find the Stamps.com 2022 rate tables for:

  • First Class Mail Packages

  • Priority Flat Rate

  • Priority Regional Rate Boxes

  • Priority Mail

Any size restrictions will also be listed in each section.

Check Weight and Dimensions

To avoid rate adjustments, ensure that you are using appropriate dimensions and weight for the service. Postage providers may change weight and dimension requirements for service classes at any time.

Visit USPS Mail Classes Comparison for the most updated information.

New Fees Beginning April 2022

Fees and surcharges may apply to Priority Mail, Priority Mail Express, and Parcel Select Ground shipments based on the package volume and dimensions. Learn more about USPS Nonstandard Fees & Dimensional Noncompliance Fees.

Flat Rate packages and Regional Rate packages are not applicable.

If dimensions are not provided or if dimensions are inaccurate: A $1.50 fee will be added for packages that are greater than one cubic foot in volume or have a box length greater than 22 inches.

If packages have dimensions that exceed machinable sorting requirements: New nonstandard fees will apply:

  • Packages greater than 2 cubic feet in volume: $15.00 surcharge

  • Packages with a box length over 22 inches: $4.00 surcharge

  • Packages with a box length over 30 inches: $15.00 surcharge

These fees apply to shipping labels created through an online postage provider (e.g., ShipStation).

First Class Mail Package

If your package weighs less than 16oz and does not exceed 22" length x 18" width x 15" height (USPS measurement guide), it qualifies for First Class Mail.

First Class Mail rate are based on both weight and zone.

Priority Flat Rate

Priority Mail Flat Rate is a 1-3 day shipping service that charges one flat rate for your package/envelope, with a maximum allowable weight of 70 lbs. 

Priority Regional Rate Boxes

Priority Regional Rate Boxes have a zone-dependent flat rate. Depending on the zone you are shipping to, you may find the Regional Rate Box is cheaper. Essentially, Flat Rate Boxes are ideal for shipping long distances and Regional Rate Boxes are ideal for shorter distances.

Below are the costs of sending Regional Rate Boxes to each of the USPS's 9 zones. 

Regional Rate Box A: 10" x 7" x 4.75"

Regional Rate Box B: 12" x 10.25" x 5"

To view zones relative to your ship from location, use the USPS Domestic Zone Chart tool

Priority Mail Packages/Thick Envelope

Priority Mail packages or thick envelopes are a great way to quickly, yet efficiently, ship packages that are under 70 lbs and do not exceed 108" in combined length and girth (girth = the distance around its thickest part).

Incorrect dimensions or oversized packages with sides that exceed 20" or 30", or over 2 cubic feet, are subject to the USPS Nonstandard Fee and Dimensional Noncompliance Fee.

For information on cubic pricing for packages under 20 lbs and 0.5 cubic feet, please contact your Stamps.com account representative directly.

Notes on DIM and International Shipments

Keep the following in mind when using USPS services through Stamps.com:

  • Nonstandard Fee & Dimensional Noncompliance Fee: If you enter incorrect dimensions or a package has a side that exceeds 20" or 30" or is over 2 cubic feet, you incur an added surcharge fee. Learn more about the April 2022 USPS surcharge updates.

  • DIM Weight: When calculating dimensional weight, the weight divisor has been lowered to 166. The new formula to determine dimensional weight is (Length x Width x Height) / 166.

    • If DIM weight applies to your package, the carrier will compare the DIM weight and actual weight and charge the higher of the two for the label. For this reason, ShipStation recommends that you always enter the correct package dimensions when you configure your shipments. Thus, the rate you see in ShipStation will reflect the correct weight.

      If the label you print for your shipment reflects the incorrect rate as determined by USPS, you may be subject to the USPS Automated Package Verification. This can automatically deduct the difference in postage from your USPS postage provider account.

  • The Large Package type will represent any package type over the default dimensional weight threshold of one cubic foot.

    Dimensions are required if you use the Large Package type with the Priority Mail, Priority Mail Express, or Parcel Select Ground shipping services.

  • The Package package type will represent any packages that are one cubic foot or less, and will not require dimensions in ShipStation.

  • The maximum weight for a USPS First Class International shipment that uses the Large Envelope or Flats package type with Documents as the contents type is 15.994 oz.

  • The maximum weight for a USPS First Class International shipment that uses the Large Envelope or Flats package type with a contents type other than Documents is 4.4 lbs. These shipments will automatically use Stamps.com's Global Advantage Program labels.