The cup I use most frequently has a liquid capacity of ~14oz. (~414ml) Week 1: Number used....Date.... ======================= 5 cups 02-25-15 6 cups 02-26-15 4 cups 02-27-15 5 cups 02-28-15 5 cups 03-01-15 5 cups 03-02-15 5 cups 03-03-15 ======================= Average 5.00 cups per day. Week 2: Number used....Date.... ======================= 5 cups 03-04-15 5 cups 03-05-15 5 cups 03-06-15 5 cups 03-07-15 5 cups 03-08-15 4 cups 03-09-15 5 cups 03-10-15 ======================= Average 4.86 cups per day. Week 3: Number used....Date.... ======================= 5 cups 03-11-15 6 cups 03-12-15 5 cups 03-13-15 6 cups 03-14-15 5 cups 03-15-15 5 cups 03-16-15 5 cups 03-17-15 ======================= Average 4.57 cups per day. Week 4: Number used....Date.... ======================= 5 cups 03-18-15 5 cups 03-19-15 4½ cups 03-20-15 5 cups 03-21-15 5 cups 03-22-15 5 cups 03-23-15 4 cups 03-24-15 ======================= Average 4.78 cups per day. Week 5: Number used....Date.... ======================= 4 cups 03-25-15 4 cups 03-26-15 4 cups 03-27-15 4¼ cups 03-28-15 ======================= Average 4.06 cups per day. Monthly average 4.65 cups per day.