Prepare your voice for singing with a proper warm-up. Buzz by placing your lips together and blowing through the center of your lips. Start by playing the pitch middle C on the piano. This pitch is located to the left of the double set of black keys in the center of the piano. Buzz up the first five pitches on the piano by matching pitch, then buzz back down through the five pitches to return to the original note.
Find the lowest note in your register by starting on middle C and singing down to the lowest note in your register. Go in the opposite direction to find the highest note in your register. Write these notes down.
Locate your lowest passagio. Starting on the lowest note in your range, begin singing half steps with the piano until you notice a change in vocal register. You will feel a physical change in your register when you pass the passagio. Take note of where this change occurs, and write down the exact note.
Identify your register by matching your passagio and total range with the typical ranges of other voice types. For men, you will classify as a bass, baritone or tenor. Women can be altos, mezzo-sopranos or sopranos. Select the register that fits your range most closely; vocal ranges are not set in stone and vary slightly.