This paper deals with fuel consumption estimations relating to container ships on the basis of ship service and
wave parameters. Data, on which to base estimations, was measured and recorded from a container ship during
96 months at sea. Approximating functions were calculated by the use of curve fitting techniques and regression
methods, utilizing newly developed software named ndCurveMaster. The approximation function presented in
this paper could have practical application for the estimation of container ship fuel consumption, while considering
weather routing. In addition the study clearly shows the relationship between the fuel consumption of
a container ship and the number of months since its last docking. These results may form the basis for further
research in this direction.