For me, the easiest way to figure out proper workout volume / intensity is to use strength as the indicator for growth. (getthisstrength.com)
Great app to keep track of your progress in the gym total workout volume and your personal best! (strongapp.io)
When it comes to workout out, building muscle mass requires workout volume, workout intensity, and workout frequency and this workout plan has all three. (scoobysworkshop.com)