The present invention relates to a mobile terminal, capable of easily measuring and checking a length of a real subject or a subject output on a screen using a smart measuring tape, and a length measuring method thereof, the method including selecting a virtual measuring tape function, setting a reference object, measuring a length of a subject based on a spaced distance of the reference object, the spaced distance measured by a laser when the reference brought into contact with the mobile terminal and one end of the subject is spaced apart therefrom, and outputting a final length of the subject when the reference object reaches another end of the subject. |