This time I prepared lifting calculations for double bridge cranes. These calculations can be used online. In this section, the calculations of the transverse rail used for the lift, the selection of the towing wire used, the selection of the power and speed of the lift motor and the transverse motor, etc. are presented. Please contact me with your suggestions to improve calculations. All the calculations will be updated if necessary according to the defects and more detailed specifications for the design of the cranes.