K-12 by MELANIE MARTINEZ has sold 600,000 copies in United Kingdom and United States.
K-12 certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 United Kingdom |
100,000 | 1x Gold | 25 February, 2022 |
United Kingdom Sales: 100,000
Certification / note: 1x Gold
Certification Date / sales as of: 25 February, 2022
|
 United States |
500,000 | 1x Gold | September 13, 2021 |
United States Sales: 500,000
Certification / note: 1x Gold
Certification Date / sales as of: September 13, 2021
|
| Total sales | 600,000 | (in 2 countries) |
Total
Sales: 600,000
(in 2 countries)
|
Year-end chart performance for K-12
| Chart 2019 | Rank |
 Mexican Albums (Top 100 Mexico) |
92 |