The existing anchor calculation formula is only applicable to the calculation of the number of anchorage waiting for berth,and when the average berth utilization coefficient P is larger than 0.8,the calculation results will appear larger deviation.In addition,the anchorage used for waiting for the tide or sheltering from wind,there is no good method used to calculate the number at present.Therefore,this paper studies the general anchorage scale calculation method and programming to achieve the fast calculation combining with actual needs.