According to Sony Music Germany, UNDER MY SKIN by AVRIL LAVIGNE has sold 8,000,000 copies worldwide. The album sold best in United States (3,000,000 copies), Japan (1,029,818 copies) and United Kingdom (600,000 copies).
UNDER MY SKIN certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Argentina |
40,000 | 1x Platinum | 22 May, 2004 |
Argentina Sales: 40,000
Certification / note: 1x Platinum
Certification Date / sales as of: 22 May, 2004
|
 Australia |
70,000 | 1x Platinum |
Australia Sales: 70,000
Certification / note: 1x Platinum
Certification Date / sales as of:
|
|
 Austria |
30,000 | 1x Platinum | 18 February, 2005 |
Austria Sales: 30,000
Certification / note: 1x Platinum
Certification Date / sales as of: 18 February, 2005
|
 Belgium |
25,000 | 1x Gold |
Belgium Sales: 25,000
Certification / note: 1x Gold
Certification Date / sales as of:
|
|
 Brazil |
125,000 | 1x Platinum | 2005 |
Brazil Sales: 125,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2005
|
 Canada |
500,000 | 5x Platinum | 2006 |
Canada Sales: 500,000
Certification / note: 5x Platinum
Certification Date / sales as of: 2006
|
 France |
100,000 | 1x Gold | 7 December, 2004 |
France Sales: 100,000
Certification / note: 1x Gold
Certification Date / sales as of: 7 December, 2004
|
 Germany |
100,000 | 1x Gold | 2004 |
Germany Sales: 100,000
Certification / note: 1x Gold
Certification Date / sales as of: 2004
|
 Grecce |
10,000 | 1x Gold |
Grecce Sales: 10,000
Certification / note: 1x Gold
Certification Date / sales as of:
|
|
 Japan |
1,029,818 | 1 Million | September 2004 |
Japan Sales: 1,029,818
Certification / note: 1 Million
Certification Date / sales as of: September 2004
|
 Korea |
81,044 | RIAK / Gaon charts |
Korea Sales: 81,044
Certification / note: RIAK / Gaon charts
Certification Date / sales as of:
|
|
 Mexico |
100,000 | 1x Platinum | 6 April, 2005 |
Mexico Sales: 100,000
Certification / note: 1x Platinum
Certification Date / sales as of: 6 April, 2005
|
 New Zealand |
7,500 | 1x Gold |
New Zealand Sales: 7,500
Certification / note: 1x Gold
Certification Date / sales as of:
|
|
 Portugal |
10,000 | 1x Silver |
Portugal Sales: 10,000
Certification / note: 1x Silver
Certification Date / sales as of:
|
|
 Russia |
20,000 | 1x Platinum | 2004 |
Russia Sales: 20,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2004
|
 Singapore |
5,000 | 1x Gold | 2019 |
Singapore Sales: 5,000
Certification / note: 1x Gold
Certification Date / sales as of: 2019
|
 Spain |
50,000 | 1x Gold | 2004 |
Spain Sales: 50,000
Certification / note: 1x Gold
Certification Date / sales as of: 2004
|
 Switzerland |
40,000 | 1x Platinum | 2004 |
Switzerland Sales: 40,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2004
|
 United Kingdom |
600,000 | 2x Platinum | 22 July, 2013 |
United Kingdom Sales: 600,000
Certification / note: 2x Platinum
Certification Date / sales as of: 22 July, 2013
|
 United States |
3,000,000 | 3x Platinum | 18 January, 2006 |
United States Sales: 3,000,000
Certification / note: 3x Platinum
Certification Date / sales as of: 18 January, 2006
|
 Europe (IFPI) |
1,000,000 | 1x Platinum | 2004 |
Europe (IFPI) Sales: 1,000,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2004
|
| Worldwide sales | 8,000,000 | Sony Music Germany |
Total
Sales: 8,000,000
Source: Sony Music Germany
|
Year-end chart performance for UNDER MY SKIN
| Chart 2004 | Rank | Sales |
| Australian Albums (ARIA) |
36 | >70,000 |
| Austrian Albums (Ö3 Austria) |
13 | |
| Belgian Albums (Ultratop Flanders) |
51 | |
| Belgian Albums (Ultratop Wallonia) |
34 | |
 Danish Albums (Hitlisten) |
87 | |
 Dutch Albums (Album Top 100) |
80 | |
 European Albums (Music & Media) |
8 | |
| French Albums (SNEP) |
57 | |
| German Albums (Offizielle Top 100) |
14 | |
 Hungarian Albums (MAHASZ) |
72 | |
 Italian Albums (FIMI) |
30 | |
| Japanese Albums (Oricon) |
8 | 924,789 |
| New Zealand Albums (RMNZ) |
48 | |
| South Korean International Albums (Gaon) |
2 | 76,336 |
| Swiss Albums (Schweizer Hitparade) |
13 | |
| UK Albums |
37 | 510,000 |
| UK Artist Albums |
31 | 510,000 |
| US Albums (Billboard 200) |
22 | |
 Worldwide Albums (IFPI Global Music Report) |
5 | |
| Chart 2005 | Rank | Sales |
| German Albums (Offizielle Top 100) |
92 | |
| Italian Albums (FIMI) |
87 | |
| US Albums (Billboard 200) |
68 |