Very often you come across a situation when weight of the product is not fixed , it is dependent on user input , like length or width. This extension solves that problem of yours.
You can now calculate weight of the product using formula, the formula consists of variables and options.
it works well with the default structure of the opencart ie theme,checkout etc; if you have customised your store with other extensions , please make query for compatibility asking at shambhalnetworks@gmail.com