| Domain | Name | Category | Type |
| IPR000169 | Cysteine peptidase, cysteine active site | Site | Active site |
| IPR001300 | Peptidase C2, calpain, catalytic domain | Domain | Domain |
| IPR002048 | EF-hand domain | Domain | Domain |
| IPR011992 | EF-hand domain pair | Family | Homologous superfamily |
| IPR018247 | EF-Hand 1, calcium-binding site | Site | Binding site |
| IPR022682 | Peptidase C2, calpain, large subunit, domain III | Domain | Domain |
| IPR022683 | Peptidase C2, calpain, domain III | Domain | Domain |
| IPR022684 | Peptidase C2, calpain family | Family | Family |
| IPR029643 | Calpain-1 | Family | Family |
| IPR033883 | Calpain subdomain III | Domain | Domain |
| IPR036213 | Calpain large subunit, domain III superfamily | Family | Homologous superfamily |
| IPR038765 | Papain-like cysteine peptidase superfamily | Family | Homologous superfamily |