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This research purpose to forecast inflation data, the forecasting results can be used as a reference for the determination of decent living costs for a single worker in one month. The method used in this study is the SARIMA method, in forecasting the inflation rate where the data is time series. SARIMA method can show forecasting results that are able to follow the movement of the actual data from the inflation rate. Based on the comparison of overall SARIMA model and with a value of MAD, MSE and MAPE smallest, show the results of forecasting the SARIMA method on inflation values are very feasible and accurate. The result KHL value with calculation results of inflation forecasting has a value close to actual data so that the value can be used as a reference for decision making a single worker in needing one month.