This file is a companion to the free file in my store: Setting Independent Reading Goals - Calculation Worksheet. The formulas are specifically configured for the time frames outlined in the Worksheet: 8 weeks of reading and 2 hours of reading per week. If you want to change these parameters, you need to change the formulas in cells B11 and B12. This should be helpful for checking the kids' math.
All you need to do is fill in the yellow boxes and you will see the expected number of books to read by the end of the time period (8 weeks) in the blue box.