If you or your cilents are using calculated shipping, you should check out our new Dimensional Weight extensions. By default, Magento doesn’t use dimensional weight calculations and your store can frequently charge the incorrect rate for shipping.
These extensions automatically add length, width, and height attributes to your store and also allow you to specify your own if you already have this data specified for your products.
Check them out here:
Dimensional Weight Extension for Fedex
Dimensional Weight Extension for UPS
Dimensional Weight Extension for USPS
Come to the site and chat if you have any questions!
Redstage Extension Store