:term:`CFOUR_CALC_LEVEL <CFOUR_CALC_LEVEL (CFOUR)>`
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      Defines the level of calculation to be performed. **Psi4 Interface:** Keyword set from argument of computation command: CCSD if ``energy('c4-ccsd')``, *etc.* See :ref:`Energy (CFOUR) <table:energy_cfour>` and :ref:`Gradient (CFOUR) <table:grad_cfour>`. for all available.

      * **Type**: string
      * **Possible Values**: SCF, HF, MBPT(2), MP2, MBPT(3), MP3, SDQ-MBPT(4), SDQ-MP4, MBPT(4), MP4, CCD, CCSD, CCSD(T), CCSDT-1, CCSDT-1b, CCSDT-2, CCSDT-3, CCSDT-4, CCSDT, CC2, CC3, QCISD, QCISD(T), CID, CISD, UCC(4), B-CCD
      * **Default**: SCF