THE BOY WHO KNEW TOO MUCH by MIKA has sold 735,000 copies in 6 countries. The album sold best in France (300,000 copies), United Kingdom (300,000 copies) and Italy (50,000 copies).
THE BOY WHO KNEW TOO MUCH certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Belgium |
30,000 | 1x Platinum | 2009 |
Belgium Sales: 30,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2009
|
 Canada |
40,000 | 1x Gold | 2010 |
Canada Sales: 40,000
Certification / note: 1x Gold
Certification Date / sales as of: 2010
|
 France |
300,000 | 3x Platinum | 25 March, 2010 |
France Sales: 300,000
Certification / note: 3x Platinum
Certification Date / sales as of: 25 March, 2010
|
 Italy |
50,000 | 1x Platinum | 2015 |
Italy Sales: 50,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2015
|
 Switzerland |
15,000 | 1x Gold | 2009 |
Switzerland Sales: 15,000
Certification / note: 1x Gold
Certification Date / sales as of: 2009
|
 United Kingdom |
300,000 | 1x Platinum | 27 May, 2022 |
United Kingdom Sales: 300,000
Certification / note: 1x Platinum
Certification Date / sales as of: 27 May, 2022
|
| Total sales | 735,000 | (in 6 countries) |
Total
Sales: 735,000
(in 6 countries)
|
Year-end chart performance for THE BOY WHO KNEW TOO MUCH
| Chart 2009 | Rank |
| Belgian Albums (Ultratop Flanders) |
40 |
| Belgian Albums (Ultratop Wallonia) |
41 |
 Dutch Albums (Album Top 100) |
77 |
| French Albums (SNEP) |
12 |
| Swiss Albums (Schweizer Hitparade) |
60 |
| UK Albums (Charts Plus) |
99 |
| Chart 2010 | Rank |
| French Albums (SNEP) |
27 |
| Italian Albums (FIMI) |
77 |