  Spin-orbit coupling (SOC) drives interesting and non-trivial phenomena in
solid state physics, ranging from topological to magnetic to transport
properties. Thorough study of such phenomena often require effective models
where SOC term is explicitly included. However, estimation of SOC strength for
such models mostly depend on the spectroscopy experiments which can only
provide a rough estimate. In this work, we provide a simple yet effective
computational approach to estimate the on-site SOC strength using a combination
of the $ab$ $initio$ and tight-binding calculations. We demonstrate the wider
applicability and high sensitivity of our method considering materials with
varying SOC strengths and the number of SOC active ions. The estimated SOC
strengths agree well with the proposed values in literature lending support to
our methodology. This simplistic approach can readily be applied to a wide
range of materials.
