PlanAhead 2018 Planner, 18 Month Large Weekly/Monthly Planner. PlanAheads new 18 month planner gives you 6 months extra stemming from July 2017 and concluding in December of 2018. The 2018 planner features multiple sections including: planner, contacts, resources, and notes as well as having monthly and weekly tabs. The large size planner measures at 8.6 inches x 10.125 inches. Customer will receive one planner. The color is random and can not be chosen at this time.