A system is described for measuring web traffic relating to an offline advertising campaign. The system may include a processor and a memory. The memory may be operatively connected to the processor and may store an offline advertising campaign of an advertiser, a time period, a set of users and web traffic data. The processor may identify the offline advertising campaign, and the period of time the offline advertising campaign was available to a set of users. The processor may measure the web traffic related to the offline advertising campaign of the users during the time period.