18 MONTHS by CALVIN HARRIS has sold 2,355,000 copies in 11 countries. The album sold best in United States (1,000,000 copies), United Kingdom (900,000 copies) and Canada (160,000 copies).
18 MONTHS certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Australia |
70,000 | 1x Platinum |
Australia Sales: 70,000
Certification / note: 1x Platinum
Certification Date / sales as of:
|
|
 Brazil |
80,000 | 2x Platinum | 2021 |
Brazil Sales: 80,000
Certification / note: 2x Platinum
Certification Date / sales as of: 2021
|
 Canada |
160,000 | 2x Platinum | 2017 |
Canada Sales: 160,000
Certification / note: 2x Platinum
Certification Date / sales as of: 2017
|
 Denmark |
10,000 | 1x Gold | 16 January, 2018 |
Denmark Sales: 10,000
Certification / note: 1x Gold
Certification Date / sales as of: 16 January, 2018
|
 Ireland |
7,500 | 1x Gold | 2012 |
Ireland Sales: 7,500
Certification / note: 1x Gold
Certification Date / sales as of: 2012
|
 Mexico |
60,000 | 1x Platinum | 3 July, 2020 |
Mexico Sales: 60,000
Certification / note: 1x Platinum
Certification Date / sales as of: 3 July, 2020
|
 New Zealand |
7,500 | 1x Gold |
New Zealand Sales: 7,500
Certification / note: 1x Gold
Certification Date / sales as of:
|
|
 Poland |
20,000 | 1x Platinum | 3 September, 2014 |
Poland Sales: 20,000
Certification / note: 1x Platinum
Certification Date / sales as of: 3 September, 2014
|
 Sweden |
40,000 | 1x Platinum | 2013 |
Sweden Sales: 40,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2013
|
 United Kingdom |
900,000 | 3x Platinum | 7 October, 2016 |
United Kingdom Sales: 900,000
Certification / note: 3x Platinum
Certification Date / sales as of: 7 October, 2016
|
 United States |
1,000,000 | 1x Platinum | 9 June, 2020 |
United States Sales: 1,000,000
Certification / note: 1x Platinum
Certification Date / sales as of: 9 June, 2020
|
| Total sales | 2,355,000 | (in 11 countries) |
Total
Sales: 2,355,000
(in 11 countries)
|
Year-end chart performance for 18 MONTHS
| Chart 2012 | Rank | Sales |
| Australian Albums (ARIA) |
79 | >35,000 |
| UK Albums (Charts Plus) |
17 | |
| Chart 2013 | Rank | Sales |
| Australian Albums (ARIA) |
63 | |
 Belgian Albums (Ultratop Flanders) |
174 | |
| Swedish Albums (Sverigetopplistan) |
60 | |
| UK Albums (Charts Plus) |
18 | |
| Chart 2014 | Rank | Sales |
| Swedish Albums (Sverigetopplistan) |
34 | |
| UK Albums (Official Charts) |
72 | |
| Chart 2015 | Rank | Sales |
| Swedish Albums (Sverigetopplistan) |
84 |
Decade-end chart performance for 18 MONTHS
| Chart 2010's | Rank |
| UK Albums (Official Charts) |
48 |