Two-stage solid-state reaction-based intermediate columbite phase technique has been employed to fabricate the single-phase Pb[(Mg1/3Nb2/3)0.7Ti0.3]O3 (PMN-0.3 PT) electro-ceramics. The Rietveld refinement of XRD data suggests the presence of monoclinic crystal structure with space group ‘Cm’. The bulk ceramics interior looks very flat without voids and well-defined grain boundaries, which confirm the high quality single-phase microstructure. The final elemental compositions of the material are similar to the initial compositions within the instrument's experimental error. We have investigated pressure and temperature-dependent dielectric and impedance properties to test the possible applications as a pressure transducer. A well defined square hysteresis with large polarization confirms the high quality ferroelectric and piezoelectric properties. For the first time, we have studied the pressure sensing properties of PMN-0.3 PT ceramic in the range 25–250 kPa in barometric pressure using dead weights and 10–50 MPa hydraulic pressure (oil medium). The ceramic demonstrates a gradual change in capacitance as well as in capacitive reactance, with % sensitivity of 0.10 MPa−1 in the Hydraulic pressure range (10–50 MPa), and with % sensitivity of 0.02 kPa−1 in the Barometric pressure range (25–250 kPa). These results demonstrate the suitability of PMN-0.3 PT ceramic as a pressure transducer.