Various systems and methods for providing a proximity measurement system are provided herein. A proximity measurement system includes: a user tracking service to calculate a travel area of a user, the travel area representing an area that the user has traveled within during a period of time, a proximity service to: identify a reminder task created by the user, the reminder task having an associated point of interest; identify a plurality of geographical locations of the point of interest; and calculate an effective proximity measure based on the travel area of the user and the plurality of geographical locations; and a notification service to transmit a notification to the user when the user is within the effective proximity measure of any one of the plurality of geographical locations.