According to Warner Music Japan, DEMON DAYS by GORILLAZ has sold 8,000,000 copies worldwide. The album sold best in United States (2,000,000 copies), United Kingdom (1,840,000 copies) and Australia (210,000 copies).
DEMON DAYS certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Australia |
210,000 | 3x Platinum | JANUARY 2006 |
Australia Sales: 210,000
Certification / note: 3x Platinum
Certification Date / sales as of: JANUARY 2006
|
 Austria |
30,000 | 1x Platinum | 11 January, 2006 |
Austria Sales: 30,000
Certification / note: 1x Platinum
Certification Date / sales as of: 11 January, 2006
|
 Canada |
160,000 | 2x Platinum | May 5, 2023 |
Canada Sales: 160,000
Certification / note: 2x Platinum
Certification Date / sales as of: May 5, 2023
|
 Denmark |
60,000 | 3x Platinum | 1 August, 2017 |
Denmark Sales: 60,000
Certification / note: 3x Platinum
Certification Date / sales as of: 1 August, 2017
|
 France |
200,000 | 1x Platinum | 2006 |
France Sales: 200,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2006
|
 Germany |
200,000 | 1x Platinum | 2019 |
Germany Sales: 200,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2019
|
 Ireland |
75,000 | 5x Platinum | 2005 |
Ireland Sales: 75,000
Certification / note: 5x Platinum
Certification Date / sales as of: 2005
|
 Japan |
100,000 | 1x Gold | December 2005 |
Japan Sales: 100,000
Certification / note: 1x Gold
Certification Date / sales as of: December 2005
|
 Mexico |
50,000 | 1x Gold | 18 October, 2005 |
Mexico Sales: 50,000
Certification / note: 1x Gold
Certification Date / sales as of: 18 October, 2005
|
 New Zealand |
45,000 | 3x Platinum |
New Zealand Sales: 45,000
Certification / note: 3x Platinum
Certification Date / sales as of:
|
|
 Portugal |
20,000 | 1x Platinum |
Portugal Sales: 20,000
Certification / note: 1x Platinum
Certification Date / sales as of:
|
|
 Russia |
10,000 | 1x Gold | 2005 |
Russia Sales: 10,000
Certification / note: 1x Gold
Certification Date / sales as of: 2005
|
 Switzerland |
20,000 | 1x Gold | 2005 |
Switzerland Sales: 20,000
Certification / note: 1x Gold
Certification Date / sales as of: 2005
|
 United Kingdom |
1,840,000 | 6x Platinum | 29 July, 2016 |
United Kingdom Sales: 1,840,000
Certification / note: 6x Platinum
Certification Date / sales as of: 29 July, 2016
|
 United States |
2,000,000 | 2x Platinum | 28 March, 2006 |
United States Sales: 2,000,000
Certification / note: 2x Platinum
Certification Date / sales as of: 28 March, 2006
|
 Europe (IFPI) |
2,000,000 | 2x Platinum | 2006 |
Europe (IFPI) Sales: 2,000,000
Certification / note: 2x Platinum
Certification Date / sales as of: 2006
|
| Worldwide sales | 8,000,000 | Warner Music Japan |
Total
Sales: 8,000,000
Source: Warner Music Japan
|
Decade-end chart performance for DEMON DAYS
| Chart 2000's | Rank | Sales |
| Australian Albums (ARIA) |
90 | >210,000 |
| UK Albums (Music Week) |
45 |