A method for determining the parameters connected to the run times of elevators and for using said parameters in the control of the elevators in an elevator system includes selecting a plurality of floor pairs from a plurality of floors served by the elevators; measuring runs between the selected floor pairs with one or more elevators; registering run events connected to the measured runs; determining, on the basis of the run events, a plurality of run time parameters connected to the run times; and controlling the elevators based on the aforementioned run time parameters when the elevators are in transport operation.