Warm up your voice gently
Start at a comfortable middle note
Sing one note at a time moving downward
Stop when the lowest note becomes strained or unclear
Start again at the middle note
Sing one note at a time moving upward
Stop when the highest note becomes strained or unclear
Repeat the process several times for consistency
Record your lowest and highest comfortable notes
Identify your vocal type based on the full comfortable range
Use a piano, keyboard, or tuning app to check notes
Avoid forcing your voice beyond comfort
Recheck your range on different days for accuracy