Thanks to Brainsquirt: Following is a handy link to a 1 rep max calculator. You can use this to base the various peaking programs I recommend in the Feast Phase of The Blueprint.
https://www.nsca-lift.org/fly%20solo%20p ... onearm.asp
This works for many exercises but in particular the big 3 (Squat, Bench and Deadlift).
Check it out!