USPS Shipping Calculator

Save up to 90% on USPS Rates with Shippo. Calculate your savings.

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Access Discounted Shipping Rates

Shippo offers discounted rates—up to 90% off retail rates—for USPS, DHL Express, UPS, FedEx, and more to help you save money on your shipping mix.

You can also connect your own account for a global network of 55+ carriers, so you can compare rates for every package.

See our Global Carrier Network

Frequently Asked Questions


How do I use the shipping calculator?

This shipping calculator can help you determine the rate you’ll be charged to ship your package. Simply enter in your package information: package dimensions, package weight, sender and destination addresses, etc. Then, we’ll display all available rates. To purchase these rates, sign up for a free Shippo account.


How do I calculate shipping costs?

All of the main carriers, including USPS, UPS, FedEx, and DHL Express, require the following to calculate shipping: origin and destination address postal codes, package weight, and package dimensions. The easiest way to calculate shipping costs is using the above shipping calculator or signing up for a free Shippo account to view postage rates.


Does the USPS charge by weight or size?

USPS shipping costs vary depending on the service level used. For USPS Priority Mail, for example, the cost is based on weight and distance traveled. There are a few exceptions. First, USPS Priority Mail Cubic is one of the cheapest shipping options for packages smaller than a shoebox simply because the rates are determined by package size instead of weight. For packages larger than 1 cubic foot in volume, the USPS also implements Dimensional Weight pricing, which takes size into account when determining price.


Can I use my own box for USPS Flat Rate?

You must use USPS-provided boxes that are branded with the USPS Flat Rate logo to ship via USPS Priority Mail Flat Rate. Make sure you’re not using some of the other branded USPS packaging options, since the service level must match what’s on the box. You can order USPS Flat Rate boxes on the USPS website to be delivered to your door for free.


How much does USPS shipping cost per pound?

USPS shipping costs are calculated based on weight and distance traveled. Packages weighing less than one pound start at $2.66 via USPS First Class Package Service. If your package weighs one pound, you’ll want to use USPS Priority Mail which starts at $6.95 with Shippo’s special Cubic pricing. USPS accepts packages weighing up to 70 pounds.


What is the cheapest way to ship internationally?

The USPS is a cost-effective option for shipping internationally. There are a few great service levels to choose from: First Class Package International, for lightweight packages; Priority Mail International, for packages weighing more than one pound; and Priority Mail Express International, for packages that need to arrive quickly. With Shippo, all you need to do is enter your package information and you’ll automatically see the cheapest way to ship it internationally within the drop down menu.

*Rates are subject to change and do not include potential fees to use Shippo’s software (see pricing plans).

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