How to find your range? The comfortable range is called your tessitura. After you warm up your voice by humming high, medium and low pitches without straining, Use the piano. Start with middle C. Women will be able to go up past C5. Men will be able to go down past E3. If you have a five octave 61 keys keyboard the lowest note is C2 and the highest is C7. Also notice that the octave number increases starting at C.