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Electromagnetic methods have been widely used in the measurement of the water content of the soil. These methods utilise the permittivity as electrical properties of the soil, to determine the moisture content of the soil. Since the measurements are carried out indirectly, a calibration between permittivity and the water content of the soil is needed. Generally, the calibration method generated by using an empirical and mixing model. This study presents a new method of calibration by using a normalisation approach to calibrate the value of the permittivity of the water content of the soil. Secondary data was used to compare new calibration with other methods from previous studies. This calibration provides satisfactory results when compared to other methods.