USPS Priority Mail Flat Rate Rate Table (Shopify Advanced Customer)

New Member
3 0 2



We're migrating to Shopify.


We exclusively ship our packages with USPS Priority Mail Flat Rate:

1. Padded Envelope

2. Small Flat Rate Box

3. Medium Flat Rate Box

4. Large Flat Rate Box

5. Regional A

6. Regional B


We'll be a Shopify Advanced Plan Customer.


I'm looking to price in Free Shipping to all of our products.


I'm looking to calculate/find a rate table to determine how much each box costs to ship via Shopify's Fulfillment System. We do NOT use accurate weight as some of the large boxes weigh up to 30lbs while others weigh less than 5lbs.


Regional Boxes are based on pricing from (Ship From Zip Code:94118 --> Ship To Zip Code: 10017)


Any help would be appreciated in finding this information.


Replies 4 (4)
Shopify Partner
796 31 90

Have you tried the Shopify shipping calculator for USPS and DHL?

Customer Success @ PluginHive
Shipping Automation | FedEx shipping | Multi-carrier shipping | Shipment Tracking | Australia Post shipping
New Member
3 0 2



It calculates to $49.80 for a medium flat rate box.


Our current shipping for the same package on WooCommerce is $13.20 with Shipstation.

New Member
1 0 0

Same challenge here. USPS Priority Mail and USPS Flat Rate are two different shipping rates. We can ship ten pounds  priority mail from Washington State to New York for about $46. But the same shipment sent USPS flat rate is only $14.40. 

I have priority mail enabled as a shipping option but flat rate is not an option I'm able to enable. I'd appreciate help with this, as well.

New Member
1 0 0

Was this problem ever solved.  We only use Flat Rate (USPS) and Media Mail (USPS) for our products. I don't see an option for Flat Rate.