Compa ratio: the formula, how to calculate it, and what a good compa ratio looks like
Compa ratio is an employee's base salary divided by the midpoint of their salary range, times 100. Someone earning $95,000 against a $100,000 midpoint has a compa ratio of 95 percent. Above 100 percent means paid above the midpoint, below 100 percent means paid under it. Most companies treat 80 to 120 percent as the acceptable span. The metric only works if the midpoint is real, which is where most of the trouble starts.
The formula takes ten seconds. Using it well takes a bit more, because a compa ratio is only as honest as the range underneath it, and because the version that actually changes decisions is the group compa ratio, not the individual one. This covers both, plus the averaging mistake that quietly hides pay gaps on a lot of comp spreadsheets.
The compa ratio formula
There is one formula, and it does not vary by industry or company size:
Compa ratio = (Base salary ÷ Salary range midpoint) × 100
Two rules about the inputs. Use base salary only: no bonus, no equity, no overtime, no benefits value. The midpoint is a base salary number, so mixing in variable pay compares two different things and inflates the result. And use the midpoint of the band for the employee's current role and level, not the band they are hoping to move into.
Worked example. Your senior support specialist band runs $72,000 to $108,000 with a $90,000 midpoint. Priya earns $84,000. Her compa ratio is 84,000 ÷ 90,000 = 0.933, or 93.3 percent. She is paid about 7 percent under the midpoint, which is a perfectly normal place for someone eighteen months into the level.
What is a good compa ratio?
There is no single good number, which is the honest answer most calculators skip. A compa ratio is a description, not a grade. The question is always whether the number matches the reason for it. Here is the convention most compensation teams work from:
| Compa ratio | Usually means | What to do about it |
|---|---|---|
| Below 80% | Paid below the band. Usually a salary that never caught up, or a promotion with no pay change. | Investigate and correct. This is your retention and pay equity risk. |
| 80% to 90% | New to the level, still building the skills the band pays for. | Fine by design. Expect movement upward over the first year or two. |
| 90% to 110% | Fully competent, performing the role as scoped. The healthy core. | Nothing. Most of your people should be here. |
| 110% to 120% | Experienced, high performing, or scarce in your market. | Fine, but check whether the next promotion is overdue. |
| Above 120% | Outgrown the band, or the band is stale. | Relevel the person or refresh the band. Do not just freeze their pay. |
A whole team clustered at 85 percent is not a sign of disciplined spending. It usually means the bands drifted above what you actually pay, and you will find out when someone resigns. A team clustered at 115 percent means the opposite: the bands are below your real market and your next offer will be awkward.
Group compa ratio, and the averaging trap
The individual compa ratio tells you about one person. The group compa ratio is the one that runs a compensation review, because it tells you whether a team, a level, a department or a demographic group is paid where you intended.
There are two ways to compute it, and they disagree:
- Aggregate group compa ratio (recommended): sum every salary, sum every midpoint, then divide. This weights by the size of each job, which is what you want.
- Average of individual compa ratios: add up each person's ratio and divide by headcount. This weights a $45,000 coordinator exactly the same as a $210,000 engineering lead.
The second method is the trap, and it is on a lot of spreadsheets. Take a five-person team where four junior people sit at 105 percent and one senior engineer, earning three times as much, sits at 78 percent. The average of the ratios is 99.6 percent, which looks healthy and hides the problem entirely. Weight by salary and the aggregate lands near 90 percent, which correctly tells you a large amount of your payroll is underpaid against its band. Use the aggregate method for any group decision, and always look at the distribution, not just the headline number.
Compa ratio vs range penetration
Compa ratio compares salary to the midpoint. Range penetration compares salary to the entire range, minimum to maximum:
Range penetration = ((Base salary − Range minimum) ÷ (Range maximum − Range minimum)) × 100
When the midpoint sits exactly halfway between the minimum and the maximum, a 100 percent compa ratio is the same position as 50 percent range penetration. That equivalence is quoted a lot, and it quietly breaks the moment your midpoint is not the arithmetic middle of the band. If you build bands as a midpoint plus or minus a percentage, the midpoint is halfway and the equivalence holds. If you build them from a market minimum times a spread, it often does not, and the two metrics will tell managers different stories about the same person. Check which convention your bands actually use before you put both numbers on one dashboard.
Practical split: use compa ratio when the question is about the market, for example are we paying this role what we said we would. Use range penetration when the question is about progression, for example how much room does this person have left before they need a promotion. Penetration is the more intuitive one for a manager conversation, because it answers "how far through the band am I" in a way people understand without knowing what a midpoint is.
The part nobody says out loud: your midpoint is doing all the work
Every compa ratio on your spreadsheet is a fraction with a midpoint in the denominator. Change the midpoint and every number moves. So a compa ratio is not really a measurement of your people, it is a measurement of your people against your bands, and it inherits every flaw those bands have.
This matters more than the formula. If your midpoints came from a single job posting you saw on LinkedIn, or from a survey that is three years old, or from what the last person in the seat happened to negotiate, then your compa ratios are precise numbers built on a guess. Teams get into real trouble when they make a decision on 87 percent versus 94 percent while the underlying midpoint is off by fifteen percent. Anchor midpoints to percentile market data, record the source and the date, and refresh at least annually. Our guide to how to create salary bands walks through choosing a source and setting band width, and salary bands covers the structure itself.
There is a second reason to keep midpoints current. Compa ratio started as a private management metric, and it is not private anymore. Employees compare notes, candidates arrive already knowing the range because most states now force you to post it, and plenty of them have run their offer past an AI negotiation coach before the first call. A band you cannot explain is a band you will end up defending.
How compensation teams actually use it
Four jobs, in rough order of how often they come up:
- Merit cycle budgeting. Give a larger increase to a strong performer at 82 percent than to an equally strong performer at 112 percent. Same performance, very different distance from the midpoint, so the money moves where it closes a real gap.
- Offer decisions. Set a new hire's offer at a deliberate compa ratio, typically 85 to 95 percent for someone who will grow into the role. It stops offers from being set by whoever negotiates hardest that week.
- Pay equity review. Compare aggregate group compa ratios across demographic groups within the same level. If one group's aggregate is consistently lower, you have found something worth explaining before someone else does.
- Band health. Plot the distribution for a level. Everyone bunched below the midpoint means the band is too high, everyone above means it is too low. Either way the band is wrong, not the people.
Frequently asked questions
What does a compa ratio of 100 percent mean?
A compa ratio of 100 percent means the employee is paid exactly at the midpoint of their salary range. If your compensation philosophy targets the market median, a 100 percent compa ratio means you are paying that person precisely what you said you would pay for the role. It is the intended landing spot for a fully competent employee, not a maximum.
What does a compa ratio below 80 percent mean?
Below 80 percent usually means the salary has fallen under the bottom of the band. The common causes are a salary that never caught up after the market moved, a promotion that came without a pay change, or a band that was refreshed while the salary was not. Treat it as a flag to investigate, not an automatic raise.
Can a compa ratio be over 100 percent?
Yes, and it often should be. Above 100 percent means paid above the midpoint, which is the intended result for experienced, high-performing people. Above 120 percent usually means the person has outgrown the band, and the fix is to relevel them rather than freeze their pay and wait for them to leave.
Should compa ratio include bonus?
No. Use base salary only. The midpoint you divide by is a base salary figure, so adding bonus, equity or overtime compares two different things and inflates every ratio. If you want to measure total compensation against market, build a separate total cash or total rewards comparison with its own midpoints.
How do you calculate compa ratio for a team?
Sum every team member's base salary, sum every corresponding midpoint, and divide the first by the second. Do not average the individual ratios, because that treats your lowest-paid and highest-paid roles as equally important and can hide a significant underpayment behind a healthy-looking headline number.
What is a compa ratio calculator?
A compa ratio calculator divides a salary by a range midpoint and returns the percentage. Ours is on the compa ratio calculator page, with band position and range penetration alongside it. The arithmetic is trivial, so the useful tool is the one that produces a defensible midpoint in the first place. Wagelist builds the band and the midpoint from public U.S. BLS wage data, which is the input the calculator depends on.
Start with the band, not the ratio
Compa ratio is a good metric that gets misused in one specific way: teams compute it to four decimal places on top of midpoints they cannot defend. Get the band right first, then the ratio tells you something true. If you are posting ranges in job ads, the same midpoint feeds your job posting salary ranges, and in most states that number is now a legal disclosure rather than an internal note. See pay transparency for what your state requires, and how it works for the method Wagelist uses to build the midpoint you divide by.