USPS Cubic Rates in Racko

Save money on small, heavy packages with USPS cubic pricing - a volume-based rate system available through Racko. Unlike traditional weight-based pricing, cubic rates are calculated using your package's dimensions, making them especially cost-effective for compact, heavy items.

When you enter your shipment's weight and dimensions in Racko, the system automatically compares regular and cubic rates, guaranteeing you get the lowest available price. Read on to learn how cubic pricing is calculated and how to qualify for these rates.

Available USPS Cubic Services

Priority Mail Cubic

Packages must meet these criteria:

• Maximum weight: 20 lbs
• Maximum volume: 0.50 cubic feet
• Maximum single dimension: 18 inches

Ground Advantage Cubic

A more economical but slower shipping option with these requirements:

• Maximum weight: 20 lbs
• Maximum volume: 1.0 cubic foot
• Maximum single dimension: 18 inches

Receive Cubic Rates in Racko

To receive cubic rates in Racko:

1. Choose USPS Ground Advantage (formerly Parcel Select Ground) or a domestic Priority service.
2. Choose a package type of Package.

Package Requirements

To qualify for cubic rates, your package must:

• Be 18 inches or less in its longest dimension
• Be a standard box (no tubes or rolls)
• Not be a USPS Flat Rate box (these require their own specific package type)
• Have accurate dimensions (rounded down to nearest 0.25 inch) and weight entered

Racko automatically compares regular and cubic rates, displaying the lowest available price for your shipment.

Calculating Cubic for Domestic Priority and Ground Advantage

The cubic feet measurement for the package is calculated by: [ Length x Width x Height ] / 1728 = Cubic Feet

Note: All measurements should be rounded down to the nearest quarter inch (0.25")

Priority Mail Cubic Tiers

Five pricing tiers based on cubic feet:

Tier	Cubic Feet Range
0.1	Up to 0.10
0.2	0.10 to 0.20
0.3	0.20 to 0.30
0.4	0.30 to 0.40
0.5	0.40 to 0.50

Ground Advantage Cubic Tiers

Ten pricing tiers based on cubic feet:

Tier	Cubic Feet Range
0.1	Up to 0.10
0.2	0.10 to 0.20
0.3	0.20 to 0.30
0.4	0.30 to 0.40
0.5	0.40 to 0.50
0.6	0.50 to 0.60
0.7	0.60 to 0.70
0.8	0.70 to 0.80
0.9	0.80 to 0.90
1.0	0.90 to 1.00

Soft Pack Cubic Pricing

USPS also offers special cubic rates for soft packs and poly mailers. These use a simplified measurement system based on length plus width.

Package Requirements

• Maximum weight: 20 lbs
• Maximum single dimension: 18 inches
• Cannot be tubes or rolls

Priority Mail Soft Pack Tiers

Tier	Length + Width
0.1	Up to 21"
0.2	21" to 27"
0.3	27" to 31"
0.4	31" to 34"
0.5	34" to 36"

Ground Advantage Soft Pack Tiers

Tier	Length + Width
0.1	Up to 16"
0.2	16" to 21"
0.3	21" to 24"
0.4	24" to 26"
0.5	26" to 28"
0.6	28" to 30"
0.7	30" to 32"
0.8	32" to 34"
0.9	34" to 35"
1.0	35" to 36"

Important Notes

• Regular boxes must meet dimensional requirements
• Flat Rate boxes are not eligible for cubic pricing
• Measurements must be rounded down to the nearest 0.25 inch
• The system automatically compares weight-based and cubic-based rates to provide the lowest cost