Job Leveling & Grade Midpoint Calculator
Calculate salary grade midpoints, range spreads, and compa-ratios to support structured compensation planning and job leveling decisions.
Formulas Used
Grade Midpoint:
Midpoint = (Range Minimum + Range Maximum) / 2
Range Spread:
Range Spread (%) = ((Maximum − Minimum) / Minimum) × 100
Grade Progression (successive midpoints):
Grade N Midpoint = Base Midpoint × (1 + Progression%)^(N−1)
Compa-Ratio:
Compa-Ratio (%) = (Employee Salary / Grade Midpoint) × 100
100% = fully at midpoint; <80% = below competitive; >120% = above range
Position in Range (Range Penetration):
Position (%) = ((Employee Salary − Minimum) / (Maximum − Minimum)) × 100
0–33%: Lower third | 34–66%: Middle third | 67–100%: Upper third
Successive Grade Min/Max (maintaining same spread):
Grade N Min = Grade N Midpoint / (1 + Range Spread / 200)
Grade N Max = Grade N Midpoint × (1 + Range Spread / 200)
Assumptions & References
- The midpoint is the market reference point (typically 50th percentile of market data) for a fully competent employee in the role.
- Range spread of 40–60% is typical for professional/managerial roles; 20–30% for hourly/entry-level roles (WorldatWork, 2023).
- Grade-to-grade midpoint progression of 10–20% is standard practice in most compensation structures.
- A compa-ratio of 80–120% is generally considered the acceptable competitive range; 100% indicates the employee is paid exactly at midpoint.
- Range penetration zones (lower/middle/upper thirds) align with typical career stage expectations: new hires in the lower third, fully competent employees in the middle, and tenured/expert employees in the upper third.
- This calculator assumes a symmetric salary range around the midpoint for successive grade calculations.
- References: WorldatWork Compensation Programs and Practices Survey; SHRM Compensation Best Practices; Milkovich, Newman & Gerhart, Compensation (13th ed.).