Calculate USPS Priority Mail Cubic Pricing

We offer incredible discounts with USPS Priority Mail Cubic. Since these rates are based on the size of the package, not the weight, use this calculator to find out what you'll pay. Remember! Cubic is only available for domestic packages:
  • Weighing less than 20 lbs.
  • With a cubic foot value up to 0.5.
  • With each side measuring 18 in. or less
Shippo
USPS CUBIC TIER CALCULATOR
Box
Box
Envelop
Envelope
L
in
W
in
H
in
Alert Your Dimensions Are Too Big For Cubic Tier

Your Cubic Tier is -

2021 Cubic Tier Rates

 
Cubic Tier
0-150 miles
Zone
0,1,2
150-300 miles
Zone 3
300-600 miles
Zone 4
600-1000 miles
Zone 5
1000-1400 miles
Zone 6
1400-1800 miles
Zone 7
1800+ miles
Zone 8
Territories
Zone 9
Cubic 0.1 - - - - - - - -
Cubic 0.2 - - - - - - - -
Cubic 0.3 - - - - - - - -
Cubic 0.4 - - - - - - - -
Cubic 0.5 - - - - - - - -

Your Cubic Tier is -

success
Congratulations! You’re maximizing the Cubic Tier.

2021 RATE TABLES

 
Cubic Tier
0-150 miles
Zone
0,1,2
150-300 miles
Zone 3
300-600 miles
Zone 4
600-1000 miles
Zone 5
1000-1400 miles
Zone 6
1400-1800 miles
Zone 7
1800+ miles
Zone 8
Territories
Zone 9
Cubic 0.1 $7.32 $7.59 $7.81 $8.12 $8.87 $9.14 $9.52 $16.14
Cubic 0.2 $8.14 $8.46 $8.71 $9.00 $9.68 $9.93 $10.31 $17.09
Cubic 0.3 $8.77 $8.96 $9.28 $9.97 $11.79 $12.45 $13.25 $24.69
Cubic 0.4 $8.93 $9.27 $9.66 $10.60 $13.58 $14.89 $17.01 $30.84
Cubic 0.5 $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $20.58 $38.28

Should I Use a Flat Rate Box Or My Own Packaging?

Any items small enough to fit in the USPS Priority Mail Flat Rate or Regional Rate packaging are also small enough to qualify for Cubic pricing.

We did the math to determine when you should use your own packaging (and ship Priority Mail Cubic) and when you should grab a Flat or Regional Rate box.

Here are the USPS-branded boxes that fit your Cubic Tier and when you should use them.

Your Own Packaging
Flat or Regional Rate Package

2021 Cubic Tier - USPS Small Flat Rate Box (8 11/16” x 5 7/16” x 1 ¾”)

envelope
$7.90
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $7.90 $7.90 $7.90 $7.90
1 lbs $7.16 $7.46 $7.67 $7.88 $7.90 $7.90 $7.90 $7.90
2 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
3 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
4 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
5 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
6 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
7 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
8-20 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
21-70 lbs $7.90 $7.90 $7.90 $7.90 $7.90 $7.90 $7.90 $7.90

2021 Cubic Tier - USPS Flat Rate Envelope (12 ½” x 9 ½”)

envelope
$7.40
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
1 lbs $7.16 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
2 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
3 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
4 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
5 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
6 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
7 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
8-70 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40

2021 Cubic Tier - USPS Legal Flat Rate Envelope (15” x 9 ½”)

envelope
$7.70
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.70 $7.70 $7.70 $7.70 $7.70
1 lbs $7.16 $7.46 $7.67 $7.70 $7.70 $7.70 $7.70 $7.70
2 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
3 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
4 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
5 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
6 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
7 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
8-70 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70

2021 Cubic Tier - USPS Padded Flat Rate Envelope (12 ½” x 9 ½”)

envelope
$8.00
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.00 $8.00 $8.00 $8.00
1 lbs $7.16 $7.46 $7.67 $7.88 $8.00 $8.00 $8.00 $8.00
2 lbs $7.79 $7.96 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
3 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
4 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
5 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
6 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
7 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
8-70 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00

2021 Cubic Tier - USPS Regional Rate Box A (10 ⅛” x 7 ⅛” x 5”)

envelope
Price Varies
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.43 $8.52 $8.80 $14.25
1 lbs $7.16 $7.46 $7.67 $7.88 $8.43 $8.52 $8.80 $14.25
2 lbs $7.79 $7.96 $8.24 $8.85 $10.44 $11.01 $11.69 $21.81
3 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
4 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
5 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
6 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
7 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
8 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
9 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
10 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
11 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
12 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
13 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
14 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
15 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37

2021 Cubic Tier - USPS Medium Flat Rate Box (11 ¼” x 8 ¾” x 6”)

envelope
$13.75
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.43 $8.52 $8.80 $13.75
1 lbs $7.16 $7.46 $7.67 $7.88 $8.43 $8.52 $8.80 $13.75
2 lbs $7.79 $7.96 $8.24 $8.85 $10.44 $11.01 $11.69 $13.75
3 lbs $8.00 $8.35 $8.72 $9.64 $12.70 $13.75 $13.75 $13.75
4 lbs $8.10 $8.58 $9.21 $10.43 $13.58 $13.75 $13.75 $13.75
5 lbs $8.20 $8.63 $9.53 $10.60 $13.58 $13.75 $13.75 $13.75
6 lbs $8.31 $8.67 $9.64 $10.60 $13.58 $13.75 $13.75 $13.75
7 lbs $8.73 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
8 lbs $8.79 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
9 lbs $8.93 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
10 lbs $8.93 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
11 lbs $8.93 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
12-20 lbs $8.93 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
21-70 lbs $13.75 $13.75 $13.75 $13.75 $13.75 $13.75 $13.75 $13.75

2021 Cubic Tier - USPS Large Flat Rate Box (12 ¼” x 12 ¼” x 6”)*

envelope
$19.30
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.34 $8.52 $8.80 $14.25
1 lbs $7.16 $7.46 $7.67 $7.88 $8.34 $8.52 $8.80 $14.25
2 lbs $7.79 $7.96 $8.24 $8.85 $10.44 $11.01 $11.69 $19.30
3 lbs $8.00 $8.35 $8.72 $9.64 $12.70 $14.10 $16.45 $19.30
4 lbs $8.10 $8.58 $9.21 $10.43 $14.80 $16.78 $18.96 $19.30
5 lbs $8.20 $8.63 $9.53 $11.50 $16.02 $18.08 $19.30 $19.30
6 lbs $8.31 $8.67 $9.64 $11.50 $16.02 $18.08 $19.30 $19.30
7 lbs $8.73 $9.58 $10.13 $11.50 $16.02 $18.08 $19.30 $19.30
8 lbs $8.79 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
9 lbs $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
10 lbs $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
11 lbs $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
12-20 lbs $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
21-70 lbs $19.30 $19.30 $19.30 $19.30 $19.30 $19.30 $19.30 $19.30

2021 Cubic Tier - USPS Regional Rate Box B (12 ¼” x 10 ½” x 5 ½”)

envelope
Price Varies
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.34 $8.52 $8.80 $14.25
1 lbs $7.16 $7.46 $7.67 $7.88 $8.34 $8.52 $8.80 $14.25
2 lbs $7.79 $7.96 $8.24 $8.85 $10.44 $11.01 $11.69 $21.81
3 lbs $8.00 $8.35 $8.72 $9.64 $12.70 $14.10 $16.45 $29.59
4 lbs $8.10 $8.58 $9.21 $10.43 $14.80 $16.78 $18.96 $35.63
5 lbs $8.20 $8.63 $9.53 $11.70 $16.02 $18.08 $20.58 $38.28
6 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
7 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
8 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
9 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
10 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
11 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
12 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
13 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
14 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
15-20 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28

What Should I Charge For Shipping?

Cubic pricing simplifies shipping charges, because anything that fits in the box—up to 20 pounds—will ship for the same price, just depending on the Zone.

Here are our tips for choosing the best shipping price to charge your customers.

Variable, Zone-based Pricing

If you want your customers to cover the exact cost of shipping, you’ll need to set up rules in your checkout flow to show the proper rate based on the Zone. See here for a USPS domestic zone chart.

2021 Cubic Tier Rates

 
Cubic Tier
0-150 miles
Zone
0,1,2
150-300 miles
Zone 3
300-600 miles
Zone 4
600-1000 miles
Zone 5
1000-1400 miles
Zone 6
1400-1800 miles
Zone 7
1800+ miles
Zone 8
Territories
Zone 9
Cubic 0.1 $7.32 $7.59 $7.81 $8.12 $8.87 $9.14 $9.52 $16.14
Cubic 0.2 $8.14 $8.46 $8.71 $9.00 $9.68 $9.93 $10.31 $17.09
Cubic 0.3 $8.77 $8.96 $9.28 $9.97 $11.79 $12.45 $13.25 $24.69
Cubic 0.4 $8.93 $9.27 $9.66 $10.60 $13.58 $14.89 $17.01 $30.84
Cubic 0.5 $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $20.58 $38.28

Fixed Shipping Pricing

If you’d like to charge a fixed rate, here are your options.*
LOWEST-POSSIBLE RATE
$4.56
Charge all customers the cheapest rate in your rate table, and then you must cover the difference, if any.
THE AVERAGE RATE
$7.98
Choose a shipping price that’s the average of all of the prices in your rate table.
THE FULL MONTY
$13.98
Charge all customers the most-expensive rate, and then if you pay less, you can pocket the difference.
* These rates do not include Zone 9, the Zone reserved for shipping to U.S. territories. These rates are strictly for the contiguous U.S., Hawaii, and Alaska.

How Do I Get Cubic Pricing In Shippo?

USPS Priority Mail Cubic is instantly available to all Shippo customers at signup—no volume threshold required.

Boxes

We promise you’ll always be shown the best rates during your label creation flow, including USPS Priority Mail Cubic, if your box qualifies. Make sure to select Enter Custom Dimensions or choose a qualifying Package Template when entering package details.

Cubic prices will be listed as USPS Priority Mail. Once you print your label, you’ll see Cubic in the top right corner of your label under the postage box:

Label

Envelopes and Poly Mailers (also known as Soft Pack)

To access Soft Pack pricing, select Carrier Provided Parcels* in the Package section. Scroll through the drop down and select Soft Pack. Enter the package details and the Cubic rate will load as USPS Priority Mail.

*Note: you must use your own envelope or poly mailer to qualify. Do not use a USPS-branded package.

Your Cubic Tier is -

success
Congratulations! You’re maximizing the Cubic Tier.

2021 RATE TABLES

 
Cubic Tier
0-150 miles
Zone
0,1,2
150-300 miles
Zone 3
300-600 miles
Zone 4
600-1000 miles
Zone 5
1000-1400 miles
Zone 6
1400-1800 miles
Zone 7
1800+ miles
Zone 8
Territories
Zone 9
Cubic 0.1 $7.32 $7.59 $7.81 $8.12 $8.87 $9.14 $9.52 $16.14
Cubic 0.2 $8.14 $8.46 $8.71 $9.00 $9.68 $9.93 $10.31 $17.09
Cubic 0.3 $8.77 $8.96 $9.28 $9.97 $11.79 $12.45 $13.25 $24.69
Cubic 0.4 $8.93 $9.27 $9.66 $10.60 $13.58 $14.89 $17.01 $30.84
Cubic 0.5 $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $20.58 $38.28

Should I Use a Flat Rate Box Or My Own Packaging?

Any items small enough to fit in the USPS Priority Mail Flat Rate or Regional Rate packaging are also small enough to qualify for Cubic pricing.

We did the math to determine when you should use your own packaging (and ship Priority Mail Cubic) and when you should grab a Flat or Regional Rate box.

Here are the USPS-branded boxes that fit your Cubic Tier and when you should use them.

Your Own Packaging
Flat or Regional Rate Package

2021 Cubic Tier - USPS Small Flat Rate Box (8 11/16” x 5 7/16” x 1 ¾”)

envelope
$7.90
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $7.90 $7.90 $7.90 $7.90
1 lbs $7.16 $7.46 $7.67 $7.88 $7.90 $7.90 $7.90 $7.90
2 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
3 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
4 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
5 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
6 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
7 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
8-20 lbs $7.32 $7.59 $7.81 $7.90 $7.90 $7.90 $7.90 $7.90
21-70 lbs $7.90 $7.90 $7.90 $7.90 $7.90 $7.90 $7.90 $7.90

2021 Cubic Tier - USPS Flat Rate Envelope (12 ½” x 9 ½”)

envelope
$7.40
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
1 lbs $7.16 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
2 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
3 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
4 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
5 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
6 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
7 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40
8-70 lbs $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40 $7.40

2021 Cubic Tier - USPS Legal Flat Rate Envelope (15” x 9 ½”)

envelope
$7.70
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.70 $7.70 $7.70 $7.70 $7.70
1 lbs $7.16 $7.46 $7.67 $7.70 $7.70 $7.70 $7.70 $7.70
2 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
3 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
4 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
5 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
6 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
7 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70
8-70 lbs $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70 $7.70

2021 Cubic Tier - USPS Padded Flat Rate Envelope (12 ½” x 9 ½”)

envelope
$8.00
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.00 $8.00 $8.00 $8.00
1 lbs $7.16 $7.46 $7.67 $7.88 $8.00 $8.00 $8.00 $8.00
2 lbs $7.79 $7.96 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
3 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
4 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
5 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
6 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
7 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00
8-70 lbs $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00 $8.00

2021 Cubic Tier - USPS Regional Rate Box A (10 ⅛” x 7 ⅛” x 5”)

envelope
Price Varies
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.43 $8.52 $8.80 $14.25
1 lbs $7.16 $7.46 $7.67 $7.88 $8.43 $8.52 $8.80 $14.25
2 lbs $7.79 $7.96 $8.24 $8.85 $10.44 $11.01 $11.69 $21.81
3 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
4 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
5 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
6 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
7 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
8 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
9 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
10 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
11 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
12 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
13 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
14 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37
15 lbs $7.83 $8.04 $8.34 $9.01 $10.89 $11.63 $12.64 $23.37

2021 Cubic Tier - USPS Medium Flat Rate Box (11 ¼” x 8 ¾” x 6”)

envelope
$13.75
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.43 $8.52 $8.80 $13.75
1 lbs $7.16 $7.46 $7.67 $7.88 $8.43 $8.52 $8.80 $13.75
2 lbs $7.79 $7.96 $8.24 $8.85 $10.44 $11.01 $11.69 $13.75
3 lbs $8.00 $8.35 $8.72 $9.64 $12.70 $13.75 $13.75 $13.75
4 lbs $8.10 $8.58 $9.21 $10.43 $13.58 $13.75 $13.75 $13.75
5 lbs $8.20 $8.63 $9.53 $10.60 $13.58 $13.75 $13.75 $13.75
6 lbs $8.31 $8.67 $9.64 $10.60 $13.58 $13.75 $13.75 $13.75
7 lbs $8.73 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
8 lbs $8.79 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
9 lbs $8.93 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
10 lbs $8.93 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
11 lbs $8.93 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
12-20 lbs $8.93 $9.27 $9.66 $10.60 $13.58 $13.75 $13.75 $13.75
21-70 lbs $13.75 $13.75 $13.75 $13.75 $13.75 $13.75 $13.75 $13.75

2021 Cubic Tier - USPS Large Flat Rate Box (12 ¼” x 12 ¼” x 6”)*

envelope
$19.30
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.34 $8.52 $8.80 $14.25
1 lbs $7.16 $7.46 $7.67 $7.88 $8.34 $8.52 $8.80 $14.25
2 lbs $7.79 $7.96 $8.24 $8.85 $10.44 $11.01 $11.69 $19.30
3 lbs $8.00 $8.35 $8.72 $9.64 $12.70 $14.10 $16.45 $19.30
4 lbs $8.10 $8.58 $9.21 $10.43 $14.80 $16.78 $18.96 $19.30
5 lbs $8.20 $8.63 $9.53 $11.50 $16.02 $18.08 $19.30 $19.30
6 lbs $8.31 $8.67 $9.64 $11.50 $16.02 $18.08 $19.30 $19.30
7 lbs $8.73 $9.58 $10.13 $11.50 $16.02 $18.08 $19.30 $19.30
8 lbs $8.79 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
9 lbs $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
10 lbs $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
11 lbs $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
12-20 lbs $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $19.30 $19.30
21-70 lbs $19.30 $19.30 $19.30 $19.30 $19.30 $19.30 $19.30 $19.30

2021 Cubic Tier - USPS Regional Rate Box B (12 ¼” x 10 ½” x 5 ½”)

envelope
Price Varies
Weight
Zone
0,1,2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Zone 9
0.5 lbs $7.16 $7.46 $7.67 $7.88 $8.34 $8.52 $8.80 $14.25
1 lbs $7.16 $7.46 $7.67 $7.88 $8.34 $8.52 $8.80 $14.25
2 lbs $7.79 $7.96 $8.24 $8.85 $10.44 $11.01 $11.69 $21.81
3 lbs $8.00 $8.35 $8.72 $9.64 $12.70 $14.10 $16.45 $29.59
4 lbs $8.10 $8.58 $9.21 $10.43 $14.80 $16.78 $18.96 $35.63
5 lbs $8.20 $8.63 $9.53 $11.70 $16.02 $18.08 $20.58 $38.28
6 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
7 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
8 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
9 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
10 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
11 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
12 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
13 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
14 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28
15-20 lbs $8.23 $8.64 $9.56 $12.36 $16.02 $18.08 $20.58 $38.28

What Should I Charge For Shipping?

Cubic pricing simplifies shipping charges, because anything that fits in the box—up to 20 pounds—will ship for the same price, just depending on the Zone.

Here are our tips for choosing the best shipping price to charge your customers.

Variable, Zone-based Pricing

If you want your customers to cover the exact cost of shipping, you’ll need to set up rules in your checkout flow to show the proper rate based on the Zone. See here for a USPS domestic zone chart.

2021 Cubic Tier Rates

 
Cubic Tier
0-150 miles
Zone
0,1,2
150-300 miles
Zone 3
300-600 miles
Zone 4
600-1000 miles
Zone 5
1000-1400 miles
Zone 6
1400-1800 miles
Zone 7
1800+ miles
Zone 8
Territories
Zone 9
Cubic 0.1 $7.32 $7.59 $7.81 $8.12 $8.87 $9.14 $9.52 $16.14
Cubic 0.2 $8.14 $8.46 $8.71 $9.00 $9.68 $9.93 $10.31 $17.09
Cubic 0.3 $8.77 $8.96 $9.28 $9.97 $11.79 $12.45 $13.25 $24.69
Cubic 0.4 $8.93 $9.27 $9.66 $10.60 $13.58 $14.89 $17.01 $30.84
Cubic 0.5 $9.08 $9.58 $10.22 $11.50 $16.02 $18.08 $20.58 $38.28

Fixed Shipping Pricing

If you’d like to charge a fixed rate, here are your options.*
LOWEST-POSSIBLE RATE
$4.56
Charge all customers the cheapest rate in your rate table, and then you must cover the difference, if any.
THE AVERAGE RATE
$7.98
Choose a shipping price that’s the average of all of the prices in your rate table.
THE FULL MONTY
$13.98
Charge all customers the most-expensive rate, and then if you pay less, you can pocket the difference.
* These rates do not include Zone 9, the Zone reserved for shipping to U.S. territories. These rates are strictly for the contiguous U.S., Hawaii, and Alaska.

How Do I Get Cubic Pricing In Shippo?

USPS Priority Mail Cubic is instantly available to all Shippo customers at signup—no volume threshold required.

Boxes

We promise you’ll always be shown the best rates during your label creation flow, including USPS Priority Mail Cubic, if your box qualifies. Make sure to select Enter Custom Dimensions or choose a qualifying Package Template when entering package details.

Cubic prices will be listed as USPS Priority Mail. Once you print your label, you’ll see Cubic in the top right corner of your label under the postage box:

Label

Envelopes and Poly Mailers (also known as Soft Pack)

To access Soft Pack pricing, select Carrier Provided Parcels* in the Package section. Scroll through the drop down and select Soft Pack. Enter the package details and the Cubic rate will load as USPS Priority Mail.

*Note: you must use your own envelope or poly mailer to qualify. Do not use a USPS-branded package.

Get Started Today for Free

Everything you need for professional-grade shipping + deep discounts from top carriers.
Sign Up Free