Start the song and begin tapping your foot to the beat. The beat is not the same thing as a rhythm. The rhythmical beat, or pulse, is a steady tempo that occurs throughout the piece. When people dance, they dance to a beat and not a rhythm.
Continue tapping the beat with your foot, and start the stopwatch. Time yourself for 20 seconds, and count the number of beats that occur within 20 seconds.
Multiple the number of beats in 20 seconds of time by three to give you the tempo of the piece.
Download the Tap Tempo application, and install it onto a PC, which is required to use the application.
Launch the program by double-clicking its icon, or select it through the "Program" menu.
Tap the beat of the song on the keyboard with the spacebar. After 10 to 20 seconds, the program displays the song's tempo.