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TJS reservoir is a gas reservoir located in the area of West Java. TJS reservoir has been producing since September 1999 until now, with a total production of 37115,774 MMscf. Based on the research, the TJS reservoir is dry gas reservoir reservoir with thrust in the form of a depletion drive. The purpose of calculating and evaluating of the ga initial in place of the TJS reservoir is to see the compatibility between empirical calculations and simulator calculations. This research method uses correlation data in the form of petrophysical data, PVT data, production history data and historical data on reservoir pressure. Determination of reservoir type is based on PVT data in the field using IPM PVTP software to analyze the type of reservoir. This software requires data on composition of natural gas composition, reservoir pressure and temperature. Determination of the Gas Initial In lace (GIIP) in the TJS reservoir using the material balance method based on analysis of pressure and production data, plots between P / Z to Gp. The results of the calculation of the initial TJS reservoir gas content using the material balance method obtained the initial gas content value of 50063.59 MMscf and based on the MBAL software analysis, the initial gas content value was 50661.3 MMscf. In this study, the determination of the amount of initial gas content (GIIP) in the TJS reservoir with the material balance method and analysis of the MBAL software has obtained the appropriate results.