ONE VOICE: THE GREATEST HITS by JOHN FARNHAM has sold 357,500 copies in Australia and New Zealand.
ONE VOICE: THE GREATEST HITS certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Australia |
350,000 | 5x Platinum | 2020 |
Australia Sales: 350,000
Certification / note: 5x Platinum
Certification Date / sales as of: 2020
|
 New Zealand |
7,500 | 1x Gold |
New Zealand Sales: 7,500
Certification / note: 1x Gold
Certification Date / sales as of:
|
|
| Total sales | 357,500 | (in 2 countries) |
Total
Sales: 357,500
(in 2 countries)
|
Year-end chart performance for ONE VOICE: THE GREATEST HITS
| Chart 2003 | Rank | Sales |
| Australian Albums (ARIA) |
13 | >280,000 |
| Chart 2004 | Rank | Sales |
| Australian Albums (ARIA) |
57 |
Decade-end chart performance for ONE VOICE: THE GREATEST HITS
| Chart 2000's | Rank | Sales |
| Australian Albums (ARIA) |
55 | >280,000 |