Converting Weight Units (oz to g) - Imperial to Metric

I want to convert ounces to grams (or vice versa) so I can calculate the total weight in any given material that have entries in both measurement systems. This is so I can aggregate the total weight in views. Can this be done with this module or do I have to not use it and have dedicated number fields for each measurement system type and use something like views_simple_math_field to formulate the conversion?