Abstract The use of tankers for oil and gas distribution requires auxiliary structures such as Single Point Mooring (SPM). In the process of loading cargo, tankers must maintain a level of stability so that the load transfer process runs smoothly. Stability needs to be checked using inputs in the form of structural responses in free-floating conditions to get structural responses when moored. Analysis of the motion response of tankers and SPM in free-floating conditions showed that ballast tanker loads had a greater motion response than full loads with the largest movement on roll at 3.59 deg/m. The moored motion response of the tanker has the greatest amplitude in the surge movement towards the AP with a value of -0.2251 m.