What are Compa-Ratio and Range Penetration?
Compa-ratio (comparative ratio) measures the relationship between an employee's actual salary and the midpoint of their assigned salary range. It acts as an indicator of how close an employee is to the target market rate for their job.
Range penetration looks at the total salary range (from minimum to maximum) and measures how far into that range an employee has progressed. While compa-ratio focuses on the midpoint, range penetration shows the utilization of the entire available pay band.
How to Calculate Compa-Ratio
The formula for Compa-Ratio is simple: divide the employee's actual salary by the midpoint of their salary range. The result is typically expressed as a percentage or a decimal.
Formula: Compa-Ratio = (Actual Salary / Salary Range Midpoint) × 100
Worked Example: If an employee's salary is $95,000, and their job's salary range is $80,000 to $120,000, the midpoint is $100,000. Calculation: ($95,000 / $100,000) × 100 = 95%. This indicates the employee is paid 5% below the midpoint.
How to Calculate Range Penetration
Range penetration calculates the percentage of the pay range the employee's salary has absorbed. It requires knowing the minimum and maximum of the pay band.
Formula: Range Penetration = (Actual Salary - Range Minimum) / (Range Maximum - Range Minimum) × 100
Worked Example: Using the same employee earning $95,000 in a range of $80,000 to $120,000. Calculation: ($95,000 - $80,000) / ($120,000 - $80,000) = $15,000 / $40,000 = 0.375, or 37.5%. The employee is 37.5% of the way through their available pay range.
How to Use These Metrics in Pay Decisions
A compa-ratio of 100% means the employee is paid exactly at the market target. Ratios below 100% (typically 80-95%) are common for new hires or developing employees. Ratios above 100% (105-120%) are usually reserved for highly experienced, consistently high-performing individuals.
By analyzing these metrics across departments or demographics, HR can quickly spot pay inequities, manage promotion budgets, and determine if salary bands need to be adjusted for inflation.
Frequently asked questions
What is considered a "good" compa-ratio?
A "good" compa-ratio depends on experience. New hires typically fall between 80% to 90%, while fully proficient employees sit near 100%. Highly experienced experts may reach 110% to 120%.
Why use range penetration if you already have compa-ratio?
Range penetration provides context on future earning potential. If an employee is at 90% range penetration, HR knows they are nearing the cap of their pay band and may soon need a promotion to continue growing their salary.
Can compa-ratio be below 80% or above 120%?
Yes, but it is considered a red flag. Being below 80% (green circled) implies the employee is severely underpaid compared to the band, while over 120% (red circled) means they have outgrown the band's intended pay limits.
How do you calculate the midpoint of a salary range?
The midpoint is calculated by adding the minimum and maximum of the salary range together and dividing by two. For example, ($50,000 + $70,000) / 2 = $60,000.