USPS Flat Rate Priority Mail Rates for 2021

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By Dan Barraclough | Updated: 26 January 2021

According to recent research, 95% of consumers would love free-one-day delivery.

If you’re daunted by that statistic, don’t be. Packages sent by USPS Flat Rate Priority Mail reach your customers within 1-3 days. Flat Rate Priority Mail is what Amazon, eBay, and most other e-commerce platforms rely on to ship goods to customers so quickly.

Due to the ongoing COVID-19 pandemic, consumers are relying on ecommerce deliveries more than ever. With that in mind, there’s never been a more appropriate time for your business to make the most of the Priority Mail service from USPS.

What’s the Difference Between Priority Mail and Flat Rate Priority Mail?

The difference is that Priority Mail postage costs are based on the item’s weight and delivery zone, whereas Flat Rate Priority Mail prices are based on fixed-package dimensions, which you can see below.

Flat Rate Priority Mail Prices

As of 2021/01/24, the pricing for USPS flat rate priority mail is:

Package2021 RateSize
Priority Mail Flat-Rate Envelope$7.4012-1/2″ x 9-1/2″
Priority Mail Small Flat-Rate Box$7.908-5/8″ x 5-3/8″ x 1-5/8″
Priority Mail Medium Flat-Rate Box$13.7511″ x 8-1/2″ x 5-1/2″
13-5/8″ x 11-7/8″ x 3-3/8″
Priority Mail Large Flat-Rate Box$19.3012-1/4″ x 12-1/4″ x 6″

To qualify for these prices, you have to send your package in a USPS-produced Flat Rate Envelope or Box.

usps flat rate boxes
usps flat rate envelopes
USPS Flat Rate boxes and envelopes
Both versions of Priority Mail offer the following great features:
  • Two to three-day delivery
  • Delivery to Alaska, Hawaii, Puerto Rico, Guam, or the U.S. Virgin Islands at domestic prices
  • Free Package Pickup service (USPS saves you a trip to the post office by collecting your package(s) straight from your home or your office)
  • Includes USPS Tracking® when you ship online and at retail
  • Packages insured for up to $50 (more insurance is available for a fee)
  • No surcharges for fuel or residential, rural, and Saturday delivery

Do Postage Rate Rises Apply to Flat Rate Priority Mail?

No. By law, the USPS can’t increase postage rates above the rate of inflation. In other words, the costs should remain relatively low. But the USPS can increase Flat Rate Priority Mail costs as much as it likes.

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How Do I Calculate Priority Rate Postage Costs?

Priority Mail costs vary by weight for items over a certain size. That means you need to individually weigh the items you’re posting. In order to do this, you need to use a postage meter.

Postage meters are designed to save your business money by calculating accurate postage costs. Postage meters can process your mail in half the time it would take you to buy stamps from the post office and manually apply them to all your mail.

With those factors in mind, you’ll find that using a postage meter is an excellent way to reduce your overall administrative costs, whether you’re a small business sending a few letters a week or a corporation sending two thousand packages a month.

Should I Use Flat Rate or Metered Mail?

If you want to save time and money for your business, then you should be using a postage meter.

Why? Because when you’re sending out regular mail, it works out far cheaper. If you send your mail by Priority, it’ll be faster too which will result in happier customers..

Postage meter costs start from less than $20 per month (they’re only available to lease, not to buy), but the savings quickly add up. To find out more, you can request more information about prices directly from postage meter suppliers on our webform.

Once you’ve told us what you need, we’ll match your business with postage meter suppliers that best suit your requirements. They’ll then be in touch with free, non-obligation quotes for you to compare.

Dan Barraclough

Dan’s a Senior Writer at Expert Market, specialising in digital marketing, web design, and photocopiers, amongst other topics.

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