# Understanding USPS Priority Mail Cubic: Pricing, Tiers, and Optimization

## What is USPS Priority Mail Cubic Pricing?

USPS Priority Mail Cubic is a cost-effective shipping option for small, dense packages. This service allows you to ship packages up to half a cubic foot in volume (equivalent to 12x12x6 inches or other combinations with the same volume) and weighing up to 20 pounds. To qualify for Cubic rates, the maximum size for any dimension is 18 inches.

Priority Mail Cubic pricing is based on the package's outer dimensions rather than its weight, making it an excellent choice for businesses looking to optimize their shipping costs. By strategically planning your packaging to fit within the smallest pricing tier possible for your package's contents, you can significantly reduce shipping expenses.

## How to Calculate Priority Mail Cubic Pricing Tiers

Priority Mail Cubic has five pricing tiers based on the package's cubic volume. To determine which tier your package falls into, follow these steps:

1. Measure your package's outer length, width, and height.
2. Round down any measurements that exceed the nearest quarter inch to the nearest quarter inch (e.g., 5.6 inches becomes 5.5 inches).
3. Multiply the package's length, width, and height, then divide the result by 1728 to calculate the cubic feet.

For example, to calculate the Cubic tier for a box measuring 12.3" x 9.5" x 3":

1. Round down the dimensions to 12.25" x 9.5" x 3".
2. Multiply 12.25" x 9.5" x 3" to get 349.125.
3. Divide 349.125 by 1728, resulting in approximately 0.202 cubic feet.
4. Since this package is just over 0.2 cubic feet, it would fall into the 0.3 cubic feet pricing tier.
5. If the box were slightly smaller (e.g., 12" x 9.5" x 3"), it would be in the 0.2 pricing tier and cost up to 25% less to ship.

### Using Priority Mail Cubic with Envelopes and Poly Mailers

Priority Mail Cubic can be used with envelopes or poly mailers, but using padded envelopes or poly softpacks will impact the formula for determining your pricing tier. It's important to note that Cubic-priced mailpieces cannot be rolls or tubes.

## Optimizing Your Packaging for Priority Mail Cubic

To make the most of Priority Mail Cubic pricing, carefully plan your packaging to fit within the smallest tier possible for your package's contents. This approach can lead to significant cost savings. Consider the following tips:

• Choose packaging materials that minimize empty space and protect your products.
• Experiment with different packaging configurations to find the most cost-effective solution.
• Regularly review your packaging strategy to ensure you're consistently optimizing for the lowest pricing tier.

## Priority Mail Cubic Rates and Pricing Tiers

Priority Mail Cubic rates vary based on the package's cubic volume and the shipping distance. The five pricing tiers are:

• Cubic Tier 0.1: Up to 0.1 cubic feet
• Cubic Tier 0.2: Over 0.1 to 0.2 cubic feet
• Cubic Tier 0.3: Over 0.2 to 0.3 cubic feet
• Cubic Tier 0.4: Over 0.3 to 0.4 cubic feet
• Cubic Tier 0.5: Over 0.4 to 0.5 cubic feet

Rates for each tier are determined by the shipping distance, with prices increasing for longer distances. To find the most current rates for your specific shipping needs, consult the official USPS rate charts or use a reliable shipping software solution.