People keep talking about "you don't want to add meters to feet", but that's exactly the opposite of what you want to do. You want to add inches to yards or furlongs or flea wings, and you want to get it right.
What you don't want to do is add length to weight. The true type of your value is not inches, it's length, and expressing it in inches is a formatting issue.
What you don't want to do is add length to weight. The true type of your value is not inches, it's length, and expressing it in inches is a formatting issue.