Vocal profile of Rihanna

Lowest note: Bb2(forced A2)
Highest belt:  F5
Highest note: C#6
Exclamation:  E6(Live)/G7(accidental)
Vocal type: Mezzo-soprano
Vocal range: 3 octaves 1 note 1 semitone
Vocal grade: B

Vocal positives:
She has a unique timbre that allows her to reach notes as low as B2 easily( See Te Amo). Her lower register is her strongest range( Bb2-G3), with her notes being dark, healthy, well-supported and smokey in texture. Her belting range has significantly improved over the years (C5-F5) - her belts are less shrill and her tendency to have hit and miss belts live have reduced as well.

Vocal negatives:
Although there has been a huge improvement in Rihanna's belting department, she still struggles with belts after C#5 and chooses to avoid high notes in live settings or bring them down an octave lower so she can sing them in her mid-register. Her live performances are still a hit or miss. She struggles to hold notes from D5 onwards for extensive periods of time.

Vocal range of Rihanna: