Internal Equity Check, one row
Four outputs, and the last one is not a number
Run before the offer is spoken, including before it is mentioned as a range on a screening call.
Compa-Ratio
Salary divided by band midpoint, to three decimal places. This is the figure that travels between roles, because 0.915 means the same thing in two jobs with completely different bands.
Band Penetration
Salary minus the band minimum, over the band's full width. This is the figure that predicts the next three years, because somebody at 90 percent has almost no room left however good they are. Both figures every time: compa-ratio alone hides a wide band, and penetration alone cannot be compared across roles.
Incumbents Below The Offer
A count out of the total, never an average. A comparison set can have an entirely reasonable mean and still contain one person at 0.915 with six years of tenure.
Relationship To This Hire
The output that is not a number. Any incumbent below the offer who trains, onboards or supervises the person being hired, by name. This is the sentence that changes what a hiring manager wants to do, and it is invisible in every average.