In this paper, we present a novel Zlog(Z)-based approach to the evaluation of estimators of the K-clutter-plus thermal noise parameters. In doing this, we start by deriving expressions of log-based moments of the received data, i.e., means of log(Z) and Zlog(Z), which are related to the parameters of the K-plus-noise distribution, the digamma and the hypergeometric functions. Then, by accommodating a single pulse and non-coherent integration of N-pulses, respectively, we first determine the new estimators in terms of log-based moments, first and second order moments. As the computation of these nonlinear estimates requires the use of numerical routines, we resort to the inverse of the harmonic mean of the received data to get equivalent but more interesting estimates whose expressions are independent of the confluent hypergeometric functions. Monte Carlo simulations show that the proposed estimators are more efficient than existing methods for various clutter-plus-noise situations.