  We present a comprehensive study of electron collisions with calcium atoms by
using the convergent \emph{B}-spline \emph{R}-matrix method. Elastic,
excitation, and ionization cross sections were obtained for all transitions
between the lowest 39 physical states of calcium (except for $3p^6 4s5g\
^{3,1}G$) up to the $3p^6 4s8s\ ^1S$ state, for incident electron energies
ranging from threshold to 100~eV. A multi\-configuration Hartree-Fock method
with non\-orthogonal term-dependent orbitals was employed to generate accurate
wave functions for the target states. Close-coupling expansions including the
39 physical states plus 444 pseudo-target states of calcium were used to check
the sensitivity of the results to coupling to the target continuum. The
cross-section dataset obtained from the large-scale calculations is expected to
be sufficiently accurate and comprehensive for most current modeling
applications involving neutral calcium.
