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
|
Year-end chart performance for DEMON DAYS
| Chart 2005 | Rank | Sales |
| Australian Albums (ARIA) |
14 | >140,000 |
| Austrian Albums (Ö3 Austria) |
21 | |
 Belgian Albums (Ultratop Flanders) |
39 | |
| Belgian Albums (Ultratop Wallonia) |
31 | |
| Danish Albums (Hitlisten) |
26 | |
 Dutch Albums (Album Top 100) |
93 | |
| French Albums (SNEP) |
42 | |
| German Albums (Offizielle Top 100) |
28 | |
| Irish Albums (IRMA) |
13 | |
 Italian Albums (FIMI) |
51 | |
| Mexican Albums (Top 100 Mexico) |
64 | |
| New Zealand Albums (RMNZ) |
11 | |
| Swiss Albums (Schweizer Hitparade) |
31 | |
| UK Albums |
5 | 1,210,000 |
| UK Artist Albums |
5 | 1,205,000 |
| US Albums (Billboard 200) |
41 | |
 Worldwide Albums (IFPI Global Music Report) |
11 | |
| Chart 2006 | Rank | Sales |
| Belgian Albums (Ultratop Flanders) |
94 | |
| French Albums (SNEP) |
106 | |
| UK Albums (Charts Plus) |
42 | |
| US Albums (Billboard 200) |
67 | |
| Chart 2017 | Rank | Sales |
| Mexican Albums (Top 100 Mexico) |
86 | |
| Chart 2018 | Rank | Sales |
| Danish Vinyl Albums (Hitlisten) |
29 | |
| Mexican Albums (Top 100 Mexico) |
66 | |
| Chart 2019 | Rank | Sales |
| Mexican Albums (Top 100 Mexico) |
95 |
Decade-end chart performance for DEMON DAYS
| Chart 2000's | Rank | Sales |
| Australian Albums (ARIA) |
90 | >210,000 |
| UK Albums (Music Week) |
45 |