Hi everyone,
I have a store that sells many products of varying sizes and weights. The shipping rate is based on volumetric weight, but Shopify only allows for absolute weight, without considering volume. I’d also like to be able to vary the shipping rate based on zip code. Do you have any suggestions?
We have two suggestions:
- Volumetric / Dimensional Weight Shipping
Shopify’s default shipping rates are based only on actual weight. However, if you use carrier-calculated shipping (like UPS, FedEx, USPS), those carriers automatically calculate rates using dimensional weight when needed (whichever is higher between actual and volumetric weight).
To use this, you need carrier-calculated shipping enabled (available on Advanced or Plus plans, or Basic with the add-on).
If you want to set volumetric weight manually, Shopify doesn’t support that natively. In that case, you can either:
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Use a shipping app like Intuitive Shipping or ShipperHQ to handle volumetric logic
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Or adjust product weights to reflect volumetric weight (whichever is higher)
- Zip / Postal Code-Based Rates
Shopify’s built-in shipping zones only work at the country or region level, not by specific zip codes. For zip/postal code-based shipping rates, you’ll need a third-party app.
Apps like ShipperHQ or Intuitive Shipping can handle both volumetric weight and zip code-based pricing.
Thank You
I agree with @mastroke. Just wanted to add another option worth considering - PluginHive’s Multi Carrier Shipping Label app.
For volumetric/dimensional weight, it lets you define your own dimensional factor and automatically calculates volumetric weight at checkout, so you’re not stuck manually adjusting product weights.
For ZIP/postal code-based rates, it supports zone-level rate customisation down to the ZIP code, which is exactly what Shopify’s native shipping zones can’t do.
It also covers multiple carriers (UPS, FedEx, USPS, DHL, and more) all in one place, so you’re not juggling separate carrier apps.
Might be a cleaner alternative if you want both volumetric logic and ZIP-based pricing handled in a single app rather than piecing together multiple solutions.
@CarloB Shopify’s default shipping only supports weight-based rates, so it won’t handle volumetric weight or zip code rules. For this, you’ll need a third-party app like Advanced Shipping Rules or Intuitive Shipping, which support dimensions and postcode-based pricing. For more advanced needs, you can use Carrier Calculated Shipping with a custom API.
Separate this into two requirements: packing and pricing. First, determine the packed dimensions for each likely order combination and calculate billable weight as the higher of actual weight and dimensional weight. Use the divisor specified by your carrier and service, since it is not universal.
Second, pass that billable weight into a checkout-rate setup that supports destination postal codes. Shopify’s basic weight tables will not model both requirements accurately. When testing an app or carrier-calculated setup, use a small dense order, a bulky light order and a mixed order, then compare checkout against a manual carrier quote. That will expose default-box or rounding errors before launch.