SIGNAL by TWICE has sold 387,639 copies in Korea.
SIGNAL certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Korea |
387,639 | RIAK / Gaon charts | January 2022 |
Korea Sales: 387,639
Certification / note: RIAK / Gaon charts
Certification Date / sales as of: January 2022
|
| Total sales | 387,639 | (in 1 country) |
Total
Sales: 387,639
(in 1 country)
|
Year-end chart performance for SIGNAL
| Chart 2017 | Rank | Sales |
| South Korean Albums (Gaon) |
14 | 285,294 |
| Chart 2018 | Rank | Sales |
| South Korean Albums (Gaon) |
95 | 46,328 |