Anyway, given that technology has advanced a bit since I started using  the Daniels spreadsheet, I thought I’d poke around in the Apple App  Store and see if anyone had produced an app that would calculate VDOT  values and spit out recommend training paces according to the Daniels  tables. Turns out there are a few, and one of them is free. fit2run is handy, easy to use little app that allows you to input a recent race time as a basis for determining your VDOT value 
Need Help Determining Daniels Running Formula Training Paces?: Try the Free fit2run App | Runblogger