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This paper presents a new method for Estimate at Completion (EAC) of project's time to improve earned value management system (EVMS). The new formula established consists of four variables: Scheduled Performance Index (SPI), Scheduled Percent Complete by Duration (SPCD), Actual Percent Complete by Duration (APCD), and Sum of Durations to Due Time (SDDT). The model has been validated by a simulation study using a progress generator program for typical RCPS problem project library. This program was developed in VBA-MSP and it included some basic assumptions and data were generated day by day randomly. The results show a strong linear relationship between response variable and above four predictors. Therefore, it can be concluded that the model could be used in a wide range of projects for EAC estimation.