The effect of Ca-substitution on the magnetic and electric properties of Ni_0.6Zn_x-0.4 Ca_xFe₂O₄ (x=0, 0.1, 0.2, 0.3 and 0.4) ferrites (x = 0.0, 0.01, 0.02, 0.03, and 0.05) has been studied. Samples are prepared with solid state reaction method and sintered at temperature 1250⁰C for three hours. The magnetic properties of the ferrites are characterized with high frequency complex permeability, and temperature dependent permeability measurements. The magneto transport properties and dielectric properties are discussed for different concentration of Ca substitution in Ni-Zn ferrites. In this paper magnetization has been measured by using a Vibration Sample Magnetometer (VSM) at room temperature, applying a wide range of magnetic field from - 600000 Am^-1 to + 600000 Am^-1. The saturation magnetization increases up to x = 0.01 and then it decreases. The magnetic moment decreases with increasing Ca content and it is maximum for x=0.1. Activation energy fluctuates when the resistivity of the samples varies with increasing Ca content.  The dielectric constant decreases with increasing frequency. The permeability, at room temperature, decreases with increasing Ca concentration. The Curie temperature value increases with increasing Ca content. Curie temperature was measured from the temperature dependent initial permeability. The initial permeability remains constant or increases up to Curie temperature and after that the permeability is sharply drop down.