Troy ounces to pennyweights conversion calculator above calculates how many pennyweights are in 'X' troy ounces (where 'X' is the number of troy ounces to convert to pennyweights). In order to convert a value from troy ounces to pennyweights (from oz t to dwt) type the number of oz t to be converted to dwt and then click on the 'convert' button.