  The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) is a sounding
rocket experiment that observes the soft X-ray spectrum of the Sun from 6.0 -
24 Angstrom (0.5 - 2.0 keV), successfully launched on 30 July 2021. End-to-end
alignment of the flight instrument and calibration experiments are carried out
using the X-ray and Cryogenic Facility (XRCF) at NASA Marshall Space Flight
Center. In this paper, we present the calibration experiments of MaGIXS, which
include wavelength calibration, measurement of line spread function, and
determination of effective area. Finally, we use the measured instrument
response function to predict the expected count rates for MaGIXS flight
observation looking at a typical solar active region
