  Hybrid organic inorganic formate perovskites, AB(HCOO)$_3$, is a large family
of compounds which exhibit variety of phase transitions and diverse properties.
Some examples include (anti)ferroelectricity, ferroelasticity,
(anti)ferromagnetism, and multiferroism. While many properties of these
materials have already been characterized, we are not aware of any study that
focuses on comprehensive property assessment of a large number of formate
perovskites. Comparison of the materials property within the family is
challenging due to systematic errors attributed to different techniques or the
lack of data. For example, complete piezoelectric, dielectric and elastic
tensors are not available. In this work, we utilize first-principles density
functional theory based simulations to overcome these challenges and to report
structural, mechanical, dielectric, piezoelectric, and ferroelectric properties
for 29 formate perovskites. We find that these materials exhibit elastic
stiffness in the range 0.5 to 127.0 GPa , highly anisotropic linear
compressibility, including zero and even negative values; dielectric constants
in the range 0.1 to 102.1; highly anisotropic piezoelectric response with the
longitudinal values in the range 1.18 to 21.12 pC/N, and spontaneous
polarizations in the range 0.2 to 7.8 $\mu$C/cm$^2$. Furthermore, we propose
and computationally characterize a few formate perovskites, which have not been
reported yet.
