Clarification on how Ship&co calculates total shipment weight for rate estimation

I’d like to clarify how Ship&co calculates the total shipment weight when providing shipping rate estimates at Shopify checkout.

From what I understand, Shopify always uses the default package (set in “Settings → Shipping and delivery → Packages”) when sending rate requests — even if an order contains multiple products.
For example, suppose my Shopify default package is 3 kg, but the order only contains three products with actual weights of 100 g, 200 g, and 300 g (total = 0.6 kg). In that case, the weight and size of the default package can differ significantly from the real shipment.

Could you please confirm whether Ship&co calculates the rate based on:

the total weight of all individual products from Shopify, or
the package weight and dimensions information that Shopify includes in the rate request (i.e. the default package)?

I’d like to understand which data source Ship&co relies on to determine the final shipping rate shown at checkout.

Thank you very much for your time and support!

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Ship&co Help 2025년 10월 16일 05:24

Hi Hien Nguyen
Thank you for reaching out.

I need to clarify an important point: Ship&co does not provide shipping rate estimates at Shopify checkout. Ship&co has no functionality that displays rates or calculates shipping costs on your store's checkout page.

Ship&co is a post-purchase shipping management system. This means:

Customers complete their purchase on your Shopify store using whatever shipping rates you've configured in Shopify (flat rates, carrier-calculated rates via Shopify Shipping, or third-party shipping apps)
After the order is placed, it syncs to Ship&co
You can then view carrier rates within Ship&co's order management interface and create shipping labels

Please let me know if you have any questions about how Ship&co works for post-purchase shipping management.

Best regards,
Ship&co customer support

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