WorksheetFunction.Product (Excel)
Multiplies all the numbers given as arguments and returns the product.
Arguments that are numbers, logical values, or text representations of numbers are counted; arguments that are error values or text that cannot be translated into numbers cause errors. If an argument is an array or reference, only numbers in the array or reference are counted. Empty cells, logical values, text, or error values in the array or reference are ignored.
Product (Arg1, Arg2, ..., Arg30)
Dim dblProduct As Double
dblProduct = WorksheetFunction.Product(Arg1:=)