CHAIN REACTION by JOHN FARNHAM has sold 497,500 copies in Australia and New Zealand.
CHAIN REACTION certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
|  Australia | 490,000 | 7x Platinum | SEPTEMBER 1991 |  Australia Sales: 490,000 Certification / note: 7x Platinum Certification Date / sales as of: SEPTEMBER 1991 | 
|  New Zealand | 7,500 | 1x Gold |  New Zealand Sales: 7,500 Certification / note: 1x Gold Certification Date / sales as of:  | |
| Total sales | 497,500 | (in 2 countries) | Total Sales: 497,500 (in 2 countries) | 
Year-end chart performance for CHAIN REACTION
| Chart 1990 | Rank | Sales | 
|  Australian Albums (ARIA) | 1 | >280,000 | 
| Chart 1991 | Rank | Sales | 
|  Australian Albums (ARIA) | 19 | 

