Internationally "If Your Girl Only Knew" performed moderately well peaking within the top 20 at number 20 on the Recorded Music NZ chart in New Zealand. In Europe the song peaked within the top 40 at number 21 on the UK official charts on the week ending on August 24, 1996. In 1997 the song was re-released in the UK as a double single with "One in a Million" and the song reached a new peak position within the top 20 on the Official charts. On the UK official R&B charts the song was performed even better peaking within the top 5 at number 4. According to the UK Official Chart company the originally released single of "If Your Girl Only Knew" is Aaliyah's tenth best selling single in that region.