According to Universal Music Italy, LESSONS TO BE LEARNED by GABRIELLA CILMI has sold 1,000,000 copies worldwide. The album sold best in Germany (100,000 copies), United Kingdom (100,000 copies) and Australia (70,000 copies).
LESSONS TO BE LEARNED certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Australia |
70,000 | 1x Platinum | JULY 2008 |
Australia Sales: 70,000
Certification / note: 1x Platinum
Certification Date / sales as of: JULY 2008
|
 Germany |
100,000 | 1x Gold | 2008 |
Germany Sales: 100,000
Certification / note: 1x Gold
Certification Date / sales as of: 2008
|
 Netherlands |
25,000 | 1x Gold | 2010 |
Netherlands Sales: 25,000
Certification / note: 1x Gold
Certification Date / sales as of: 2010
|
 Switzerland |
15,000 | 1x Gold | 2008 |
Switzerland Sales: 15,000
Certification / note: 1x Gold
Certification Date / sales as of: 2008
|
 United Kingdom |
100,000 | 1x Gold | 18 July, 2008 |
United Kingdom Sales: 100,000
Certification / note: 1x Gold
Certification Date / sales as of: 18 July, 2008
|
| Worldwide sales | 1,000,000 | Universal Music Italy |
Total
Sales: 1,000,000
Source: Universal Music Italy
|
Year-end chart performance for LESSONS TO BE LEARNED
| Chart 2008 | Rank | Sales |
| Australian Albums (ARIA) |
13 | >70,000 |
 Austrian Albums (Ö3 Austria) |
65 | |
| Dutch Albums (Album Top 100) |
43 | |
 French Albums (SNEP) |
134 | |
| German Albums (Offizielle Top 100) |
55 | |
| Swiss Albums (Schweizer Hitparade) |
28 | |
| UK Albums (Charts Plus) |
68 | 216,500 |