Calculating a medicament dose

A device for determining and displaying a dose of a medicament to be administered to a user based, at least in part, on a measure of physical activity of the user, the device comprising:

• a determining unit configured to determine a measure of physical activity of the user using information provided by one or more sensors;
• a computer readable memory storing a set of predefined templates comprising predefined actions, rules, and parameters defining at least an initial medicament dose value, the measure of physical activity of the user, a time elapsed between an instance of physical activity and a current time, and a target blood glucose value, wherein the determining unit is further configured to determine the dose of the medicament based, at least in part, on the measure of physical activity of the user, by execution of one or more templates from the set of predefined templates;
• and
• a display unit configured to indicate the determined dose of the medicament to the user.