The method for calculating the activity of a user, said method being implemented by a personal activity monitor intended to be securely associated with the body of the user, and by a smartphone equipped with a geolocation function, exchanging data over a wireless connection, the method comprising the steps of:-a- the activity monitor detects and counts the steps of the user,-b- the smartphone determines a first geolocation at a first time,-c- the smartphone determines a second geolocation at a second time,-d- one of the two devices calculates a distance traveled between the two geolocations,-e- one of the two devices calculates, based on the distance traveled and the number of steps taken between the two geolocations, the average stride and/or average step of the user.
