Angular filter for metric from imperial ({ft + in -> cm}, {lbs -> kg})

metric_filter.js

app.filter('metric', function(authToken){
	return function(input, type, inch) {
		var isMetric = authToken.getMetric();
		if(isMetric) {
			if(type == 'cm') {
				if(isNaN(input)) {
					return 'cm.';
				} else {
					if(inch) {
						return ((((input * 12) * 1) + (inch * 1)) * 2.54).toFixed(2) + ' cm.';
					}
					else {
						return ((((input * 12) * 1)) * 2.54).toFixed(2) + ' cm.';
					}
				}
			} else if(type == 'kg') {
				if(isNaN(input)){
					return 'kg.';
				}else{
					var amount = 0.453592 * 1;
					return (((input * amount) / 1 ) * 1).toFixed(2) + ' kg.';
				}
			}
		} else {
			if(type == 'kg') {
				if(isNaN(input)){
					return 'lbs.';
				}else{
					return input + ' lbs.';
				}
				
			} else if(type == 'cm') {
				if(isNaN(input)){
					return "ft., in.";
				}else{
					return input + "'" + inch + '"';
				}
			}
		}
	};
});

authToken.getMetric() detects if the user wants things in metric or not. This is something saved in the user's schema