$scope.updateWeight = function(weight1, weight2, units) { switch (units) { case 'kg': $scope.currentGuest.weightG = weight1 * 1000; $scope.currentGuest.weight = Math.round(weight1 * 2.20462); // weight in pounds $scope.currentGuest.weightStone = Math.round(weight1 * 0.15747); // weight in stones $scope.currentGuest.weigthLbs = // remainder for stones/pounds break; case 'lbs': break; case 'stones': // stones and pounds break; } }