>> Open Summer Cart admin panel
>> Go to the Settings menu, under 'Store Configuration' click on Localization link.
Use 'Localization' page to select a weight unit for products in your store.
You can choose between the metric unit - kilogram ("kg") or the imperial unit - pound ("lb").
Remember that you can change the weight unit just in a click, HOWEVER no conversion is applied. You will change all product weights in the store to the new unit without conversion.