According to Universal France, ONE OF THE BOYS by KATY PERRY has sold 7,000,000 copies worldwide. The album sold best in United States (3,000,000 copies), United Kingdom (600,000 copies) and Germany (300,000 copies).
ONE OF THE BOYS certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Australia |
210,000 | 3x Platinum | 2019 |
Australia Sales: 210,000
Certification / note: 3x Platinum
Certification Date / sales as of: 2019
|
 Austria |
20,000 | 1x Platinum | 23 June, 2009 |
Austria Sales: 20,000
Certification / note: 1x Platinum
Certification Date / sales as of: 23 June, 2009
|
 Belgium |
15,000 | 1x Gold | 2009 |
Belgium Sales: 15,000
Certification / note: 1x Gold
Certification Date / sales as of: 2009
|
 Canada |
160,000 | 2x Platinum | 2009 |
Canada Sales: 160,000
Certification / note: 2x Platinum
Certification Date / sales as of: 2009
|
 Chilie |
30,000 | 3x Platinum |
Chilie Sales: 30,000
Certification / note: 3x Platinum
Certification Date / sales as of:
|
|
 Denmark |
40,000 | 2x Platinum | 07 March, 2023 |
Denmark Sales: 40,000
Certification / note: 2x Platinum
Certification Date / sales as of: 07 March, 2023
|
 France |
200,000 | 2x Platinum | 20 December, 2012 |
France Sales: 200,000
Certification / note: 2x Platinum
Certification Date / sales as of: 20 December, 2012
|
 Germany |
300,000 | 3x Gold | 2013 |
Germany Sales: 300,000
Certification / note: 3x Gold
Certification Date / sales as of: 2013
|
 Ireland |
15,000 | 1x Platinum | 2008 |
Ireland Sales: 15,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2008
|
 Italy |
25,000 | 1x Gold (Sales since 2009) | 2014 |
Italy Sales: 25,000
Certification / note: 1x Gold (Sales since 2009)
Certification Date / sales as of: 2014
|
 New Zealand |
7,500 | 1x Gold |
New Zealand Sales: 7,500
Certification / note: 1x Gold
Certification Date / sales as of:
|
|
 Norway |
40,000 | 2x Platinum | 6 November, 2021 |
Norway Sales: 40,000
Certification / note: 2x Platinum
Certification Date / sales as of: 6 November, 2021
|
 Sweden |
20,000 | 1x Gold | 17 February,2009 |
Sweden Sales: 20,000
Certification / note: 1x Gold
Certification Date / sales as of: 17 February,2009
|
 Switzerland |
15,000 | 1x Gold | 2008 |
Switzerland Sales: 15,000
Certification / note: 1x Gold
Certification Date / sales as of: 2008
|
 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 | April 7, 2022 |
United States Sales: 3,000,000
Certification / note: 3x Platinum
Certification Date / sales as of: April 7, 2022
|
 Europe (IFPI) |
1,000,000 | 1x Platinum | 2009 |
Europe (IFPI) Sales: 1,000,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2009
|
| Worldwide sales | 7,000,000 | Universal France |
Total
Sales: 7,000,000
Source: Universal France
|
Year-end chart performance for ONE OF THE BOYS
| Chart 2008 | Rank | Sales |
| Australian Albums (ARIA) |
30 | >70,000 |
| Austrian Albums (Ö3 Austria) |
63 | |
| French Albums (SNEP) |
111 | |
| German Albums (Offizielle Top 100) |
86 | |
| Swiss Albums (Schweizer Hitparade) |
77 | |
| UK Albums (Charts Plus) |
47 | 261,000 |
| US Albums (Billboard 200) |
73 | |
 Worldwide Albums (IFPI Global Music Report) |
33 | |
| Chart 2009 | Rank | Sales |
| Australian Albums (ARIA) |
49 | |
| Austrian Albums (Ö3 Austria) |
26 | |
| Belgian Albums (Ultratop Flanders) |
77 | |
| Belgian Albums (Ultratop Wallonia) |
62 | |
| Danish Albums (Hitlisten) |
59 | |
| French Albums (SNEP) |
64 | |
| German Albums (Offizielle Top 100) |
46 | |
 Mexican Albums (Top 100 Mexico) |
66 | |
| Swiss Albums (Schweizer Hitparade) |
32 | |
| UK Albums (Charts Plus) |
84 | |
| US Albums (Billboard 200) |
51 | |
| US Albums (Soundscan) |
79 | 443,147 |
| Chart 2010 | Rank | Sales |
| Australian Albums (ARIA) |
94 | |
| UK Albums (Charts Plus) |
98 | |
| Chart 2011 | Rank | Sales |
| UK Albums (Charts Plus) |
180 |