How can I get accurate shipping rates using dimensional weight in my online store?

Topic summary

Issue: A musical instrument store using Lightspeed for dimensional weight (pricing based on package volume vs. actual weight) reports inaccurate Shopify shipping rates because Shopify doesn’t support dimensional weight as used via their current setup.

Needs: Accurate real-time rates that account for varied box sizes and dimensional weight, using Canada Post, Purolator, and UPS.

Proposed solution: One reply recommends the PH MultiCarrier Shipping Label app, stating it supports dimensional and weight-based rates for multiple carriers (including Canada Post, Purolator, UPS, USPS, FedEx), and allows defining custom box sizes or using carrier boxes.

Status: No confirmation of adoption or results yet. Key question remains whether Lightspeed’s dimensional data can be directly leveraged in Shopify or if an app-based workaround (like PH MultiCarrier) is the viable path.

Summarized with AI on February 14. AI used: gpt-5.

Hi @CdegraafMC

You can easily get dimensional & weight based shipping rates with PH MultiCarrier Shipping Label for multiple carriers like Canada Post, Purolator, UPS, USPS, FedEx & many more. Not just that you can add boxes of different sizes or use carrier boxes based on your requirements.

Let me know if you have any queries. I will be happy to help!