Compa-Ratio: What It Is and How to Calculate It
Compa-ratio compares a salary to the midpoint of its range. The formula, worked examples, what a good ratio is, and what to do when the number is off.
Compa-Ratio
The metric that tells you whether somebody is paid fairly for their role, the formula, and the problem few guides mention: you probably do not have a midpoint yet
Every article about compa-ratio gives you the formula, and the formula takes ten seconds: salary divided by midpoint, times a hundred. Then you try it on your own team and stop dead, because you do not have a midpoint. Most of those articles never mention that this might be an issue.
The missing midpoint is the real problem with compa-ratio at a small business, not the arithmetic. The metric requires a salary structure to exist, and most businesses this size have never built one, so the number cannot be calculated at all.
So this page does the formula quickly. Then it spends most of its time on the part that matters: where to get a midpoint when you do not have one, how to read the number once you have it, and what to do when it comes out wrong.
I build FirstHR, an onboarding and HR platform that keeps each person's job title, department, and employment details in one profile, while salaries stay in your payroll system. One caveat: pay decisions have legal consequences, and I am not a lawyer.
What Is Compa-Ratio?
Compa-ratio compares what you actually pay someone to the midpoint of the salary range for their role, expressed as a percentage. West Virginia University's compensation office uses the same formula and notes that the metric is sometimes called the compensation or comparative ratio.
The purpose is diagnostic. Compa-ratio does not tell you what to pay somebody. It tells you where they currently sit relative to what you decided the job is worth, and it prompts a question: is that where they should be, and can you say why?
Note the word "decided" in that sentence. The midpoint is not a fact about the world. It is a number you chose, and the quality of your compa-ratio is entirely dependent on the quality of that choice.
The Formula
The formula is actual salary divided by the midpoint of the range, times 100.
An employee earning $54,000 against a midpoint of $60,000: 54,000 divided by 60,000 is 0.90, times 100 is a compa-ratio of 90. They are paid 90 percent of the midpoint.
You will sometimes see it expressed as a decimal instead, 0.90 rather than 90. Same number, different convention. A compa-ratio of 0.75 and a compa-ratio of 75 mean identical things, and which one you see depends entirely on who wrote the spreadsheet.
One definitional note: the salary in the formula is base salary, annualized. Not gross pay including overtime, not total compensation including benefits. If you are inconsistent about this across people, the comparison stops meaning anything.
The formula really is the whole calculation, which is why the rest of this page is about the number you divide by.
You Do Not Have a Midpoint
You probably have no midpoint for compa-ratio, because a midpoint comes from a salary range, and building one is a step many small businesses never take.
Compa-ratio requires a salary range to exist. Not a salary. A range: a minimum, a midpoint, and a maximum, defined for each role. If you have never built pay bands, as such ranges are also called, you have no midpoints, and compa-ratio is not a metric you can compute. It is a metric you can read about.
That accumulated residue has a consequence. Undocumented pay decisions, made individually and never written down, are exactly how pay inequity arises at a small business, and it arises without anybody intending it.
Running without a pay structure is common. In the American Society of Employers' 2017 Pay Administration Survey of Michigan employers, nearly 60 percent of companies with 100 or fewer employees reported having no wage or base pay structure. The association's 2025 edition still found 38 percent of responding organizations, across all sizes, without one.
Having no pay structure is not a reason to give up. It is a reason to reframe. If you go looking for compa-ratio and cannot calculate it, you have learned something more valuable than the metric would have told you. You have no pay structure, and every compensation decision you make is currently being made without a reference point.
Building the range is the work. The ratio is a byproduct of having done it. And the good news is that building one takes an afternoon, not a project, as the next section shows.
Where to Get One
Get the midpoint from outside data on what the market pays a fully competent person in each role, never from your own payroll. Here are the sources in descending order of how much I would trust them, ending with the two to avoid.
The Bureau of Labor Statistics (BLS) occupational wage data is free, official, and the right place to start when you have nothing. The Occupational Employment and Wage Statistics survey (May 2025) carries wage estimates for roughly 830 occupations nationally, by state, and by metropolitan area, which is a defensible anchor for most roles without paying anybody.
That survey is broad rather than precise, and broad is considerably better than nothing. The mapping step is where most people go wrong, because your role has to be matched to an occupation code first. The definitions live in the Standard Occupational Classification system, and O*NET, the federal occupation database, adds the task-level detail for each one.
The BLS National Compensation Survey is the other free federal source worth knowing about, and it covers benefits as well as wages.
Job postings are the underrated source, and pay transparency laws have made them far more useful. A growing number of states now require employers to publish pay ranges in job advertisements, which means the market is telling you what it pays, in public, for free.
Collect ten postings for the same role in your area, look at the ranges, and you have a rough picture in an afternoon.
A word on the roles themselves. If your job titles are invented rather than descriptive, you cannot map them to any external wage data, which means you cannot build a band. A clear job description is the prerequisite to all of this, and writing one properly is both better hiring and the thing that makes this measurable.
Once you have a midpoint, the range is usually built around it: a minimum somewhere around 80 percent of midpoint, a maximum around 120 percent. That is the conventional shape, it is arbitrary, and it is fine. What matters is that the range exists and that you can say where it came from.
An 80-to-120 range has a spread of 50 percent, because its maximum sits 50 percent above its minimum. The WorldatWork and Deloitte Survey of Salary Structure Policies and Practices (2019) found average spreads of roughly 37 to 65 percent across traditional and market-based structures, so a 50 percent spread sits comfortably inside the norm.
How to Calculate It
To calculate compa-ratio, divide an employee's base salary by the midpoint of their range and multiply by 100. For a group, you average the individual ratios or use the aggregate method, and both are worked through below.
The individual calculation is one line. The difference between the two group methods matters more than it looks.
The average method takes each person's compa-ratio and averages them. It treats everybody equally: the ratio of the person earning $40,000 counts exactly as much as the ratio of the person earning $140,000. This is what you usually want, because the question you are asking is whether your people are paid fairly, and every person is one person.
The aggregate method divides total salaries by total midpoints. It weights the result toward higher-paid roles, because their midpoints are larger numbers. This answers a different question, which is where your payroll sits relative to market, and it is more of a finance question than a fairness question.
At your size, use the average method. With a small team and roles at very different pay levels, the aggregate method can be almost entirely determined by one or two senior people. That is exactly the distortion you do not want when you are trying to find out whether somebody junior is being underpaid.
Here is the review itself as a single sheet. It assumes the midpoint already exists, because that is the assumption the whole metric rests on: if you still need to build the range, that is the salary band exercise, and it comes first.
What this sheet adds is the two columns that turn the arithmetic into a judgment. Months fully competent, because a ratio of 85 means opposite things at three months and at three years. And why they sit here, because a number you cannot explain is the only finding that actually matters.
| A | B | C | D | E | F | G | H | I | J | K | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Employee | Role | Base salary, annualized | Midpoint for the role | Where that midpoint came from, and when it was set | Compa-ratio (salary / midpoint x 100) | Months fully competent in the role | Why they sit here | Action | Reviewed by | Date |
| 2 | Worked example: first person | $54,000 | $60,000 | [BLS wage data, published postings, survey] | 90 | ||||||
| 3 | Worked example: second person | $66,000 | $60,000 | 110 | |||||||
| 4 | |||||||||||
| 5 | |||||||||||
| 6 | |||||||||||
| 7 | |||||||||||
| 8 | |||||||||||
| 9 | Group compa-ratio (average of the column) | ||||||||||
| 10 | If any midpoint above came from your own current salaries, the ratios beside it mean nothing. | ||||||||||
| 11 | Do the low ones cluster by group? If so, stop and treat it as a pay equity question. |
What Is a Good Compa-Ratio?
The conventional answer is 90 to 110 for a fully competent employee. The more useful answer is: it depends on who the person is and how long they have been doing the job.
A university pay program draws similar lines. The compensation glossary of the University of Wisconsin-Madison School of Medicine and Public Health puts people still learning a role at 80 to 89.9 percent and staff who fully deliver at 90 to 99.9 percent.
The same glossary reserves 100 percent and above for long-tenured staff who consistently meet or exceed expectations, or for high performers preparing for their next move.
Read those bands as questions rather than verdicts. A compa-ratio of 82 is not a problem. It is a prompt. It becomes a problem only when you ask why and cannot answer, or when the answer turns out to be something you would rather not say out loud, like "she did not negotiate as hard."
The distinction that actually matters is tenure and competence, not the number itself. A person three months into a role at a compa-ratio of 85 is exactly where they should be. The same person, three years in, fully competent, still at 85, is a resignation waiting to happen, and you should not be surprised when it arrives.
Note also that the metric only sees base salary. If a chunk of somebody's compensation arrives as commission or a bonus, the ratio is describing a fraction of what they actually earn.
The single most useful discipline here is not hitting a target ratio. It is being able to explain every number you see. If you can say, for each person, why they sit where they sit, and the reasons are job-related, you are in good shape regardless of what the distribution looks like.
The reason behind each pay decision needs to be recorded when you make it, rather than reconstructed years later when somebody asks. That record belongs in the personnel file, and a reconstructed rationale reads exactly like what it is.
What to Do When It Is Off
What you do depends on which ratio is off and why. Fix the gap for a fully competent person, set a path for a newcomer, freeze rather than cut a high ratio for an average performer, and stop if the low ratios cluster by group. The list below goes through each finding in turn.
Two of those rows need emphasis. Above 120 with an average performer: freeze, do not cut. The instinct is to pull the salary back down. Do not. Cutting somebody's pay is a different and much worse problem than overpaying them: it destroys trust immediately, and in some circumstances it creates legal exposure.
That legal exposure is specific. According to the Equal Employment Opportunity Commission (EEOC) on compensation discrimination, where there is an inequality in wages between men and women, employers may not reduce the wages of either sex to equalize their pay.
The Equal Pay Act says the same thing in the statute, at 29 U.S.C. § 206(d)(1): an employer paying an unlawful differential "shall not, in order to comply with the provisions of this subsection, reduce the wage rate of any employee."
The safe correction is therefore to hold the overpaid person's salary flat and let the band catch up over time. That costs you nothing except patience, and it keeps a compensation problem from turning into a legal one.
The last row of that list, a pattern by group, is the one to take most seriously. If the low compa-ratios cluster by demographic, stop. You are no longer looking at a compensation exercise but at a potential pay equity problem, and the fix is raising the person who was underpaid.
The EEOC's compliance manual section on compensation discrimination points the same way: when discrimination is found, the remedy should include a salary increase and back pay for the unlawful difference.
Compa-Ratio vs Range Penetration
Both measures look at the same salary, but against two different reference points, so they answer subtly different questions. It is worth knowing which one you are asking.
| Compa-ratio | Range penetration | |
|---|---|---|
| Measured against | The midpoint of the range | The full span from minimum to maximum |
| Formula | (salary / midpoint) x 100 | ((salary - minimum) / (maximum - minimum)) x 100 |
| At the midpoint | 100 | 50 percent |
| At the minimum | Depends on how wide the band is | 0 percent, always |
| At the maximum | Depends on how wide the band is | 100 percent, always |
| Most useful when | Comparing across roles with similar band widths | Your ranges vary a lot in width |
The key relationship, and the thing worth memorizing: an employee at the exact midpoint has a compa-ratio of 100 and a range penetration of 50 percent. Both describe the same person sitting in the same place. Compa-ratio measures distance from the middle. Range penetration measures how far up the band they have climbed.
Range penetration takes the width of the band into account. If one of your ranges is narrow and another is wide, the same compa-ratio of 110 means quite different things in each. For most small businesses with a handful of roles, compa-ratio is the simpler and sufficient tool.
The Range Penetration Formula, Worked Through
Subtract the band minimum from the salary, divide by the full span between minimum and maximum, and multiply by 100. Take the $60,000 midpoint from earlier and build the conventional band around it: a minimum at 80 percent, which is $48,000, and a maximum at 120 percent, which is $72,000. The span is $24,000.
The person earning $54,000 sits $6,000 above the minimum, so 6,000 divided by 24,000 gives a range penetration of 25 percent. Their compa-ratio was 90. One salary, two numbers: range penetration makes their position in the band look considerably more precarious than the ratio did.
Run the second person the same way. At $66,000 they are $18,000 into the span, which is 75 percent, against a compa-ratio of 110. The pair sit 20 points apart on compa-ratio but 50 on penetration. Band width explains the gap: a dollar always moves compa-ratio by the same amount, and it moves penetration further the narrower the band is.
What It Does Not Tell You
The metric compares base salary to a band and nothing more, so it cannot tell you whether your midpoint is any good, how well anyone performs, or what people earn in total. It is frequently presented as more powerful than it is.
| What compa-ratio does not know | Why it matters |
|---|---|
| Whether your midpoint is any good | The entire metric is relative to a number you chose. A bad midpoint produces confident, precise, wrong answers |
| Anything about performance | It compares salary to a band. It has no opinion on whether the person is any good, and it should not be read as if it does |
| Total compensation | Bonuses, equity, and benefits are all invisible to it. Two people at the same compa-ratio can be paid very differently in reality |
| Whether the role is correctly defined | If somebody has outgrown their job description, the band is measuring the wrong job and the ratio is measuring nothing |
| Why the number is what it is | It surfaces a gap. It does not explain it, and the explanation is the entire value of the exercise |
| Whether a pattern is discriminatory | It can show you a cluster. Interpreting that cluster is a legal question, not a mathematical one |
The first row of that table is the one to hold onto. Compa-ratio inherits every flaw in your midpoint. If you built the band from your own existing salaries, every ratio will land near 100 and you will conclude that everything is fine, when what you have actually done is measure your salaries against themselves.
The second row, on performance, deserves saying plainly, because the metric gets misused this way constantly: compa-ratio is not a performance rating. A person with a compa-ratio of 92 is not worse than a person at 108.
Those two people are simply paid differently, and the reason might be tenure, might be scarcity, might be that one of them negotiated better on a Tuesday. The number does not know and does not care.
The third row, on total compensation, comes down to scope. Compa-ratio looks only at base salary, so the full cost of employing somebody, including the employer taxes and benefits, is entirely outside its view.
Is This Worth It at Your Size?
Compa-ratio is worth running once several people share a role, while the salary ranges behind it are worth building at any size. That is the honest answer, since most content on this subject is written by people who sell compensation software.
| Your situation | Is compa-ratio worth it? | What to do instead, or as well |
|---|---|---|
| A small team you know by name | Not really | You can hold every salary in your head. But write down a range per role anyway, because the discipline is what matters |
| A growing team with several roles | Starting to be | This is where you stop being able to see the whole picture at once. Build the bands. The ratio follows |
| Several people in the same role | Yes | You now have enough people that patterns exist and you cannot see them without a metric |
| You have no salary ranges | You cannot calculate it at all | Build the ranges. That is the work, and the metric is a byproduct |
| You are about to raise or sell | Yes | Diligence will ask about your comp structure. Not having one is a finding |
| You suspect a pay equity problem | Yes, urgently | But treat it as a legal question rather than a comp question, and get advice |
The answer that recurs in that table is to build the ranges. They are the valuable thing, and compa-ratio is what you get for free once they exist. The question behind the metric is not a mathematical one: is each person paid roughly what their role is worth, and can you explain every difference?
If reading this page produces nothing except an afternoon spent building bands for your roles, it has done its job, and you can ignore the metric entirely.
The ranges and the pay data behind them need one home. Salaries, effective dates, and job classifications scattered across offer letters and half-remembered conversations are why this exercise feels impossible. That scatter is what a human resources information system (HRIS) exists to fix.
Common Mistakes
There are six recurring errors, and the first one invalidates everything downstream of it.
Before you act on any ratio, run through these five questions.
Frequently Asked Questions
What is compa-ratio?
Compa-ratio is a pay metric that shows where one person’s salary falls against the middle of the range set for their job, and the name is short for comparative ratio. To find it, divide the person’s actual salary by the range midpoint and multiply by 100, which gives a percentage. A result of 100 means they earn exactly the midpoint, a result under 100 means they earn less than the midpoint, and a result over 100 means they earn more. It is used to check whether individuals are paid fairly relative to the range set for their job, and to spot patterns across a team.
What is the compa-ratio meaning in simple terms?
It is a way of asking whether somebody is paid roughly the right amount for the job they do. You take what you actually pay them, divide it by the middle of the range you think that job is worth, and turn it into a percentage. If they earn $54,000 and the middle of the range is $60,000, their compa-ratio is 90, which means their pay is 90 percent of the midpoint. The number itself is not a verdict. It is a prompt to ask why.
How do you calculate compa-ratio?
Divide the employee’s actual salary by the midpoint of their salary range, then multiply by 100. Someone on $54,000 with a $60,000 midpoint works out to 0.90, which is a compa-ratio of 90. A group has two options. One is to average everyone’s individual compa-ratios, which gives each person the same weight. The other is to divide the total of all salaries by the total of all midpoints, which gives the higher-paid roles more pull on the result. For a small business, the average method is usually the more useful of the two.
What is a good compa-ratio?
By convention, 90 to 110 counts as healthy for an employee who is fully competent in the role, meaning they are paid at or near the middle of their range. A result below 90 is normal while someone is still learning the job, and above 110 usually points to a strong performer, scarce skills, or long tenure. Anything under 80 or over 120 deserves a closer look. These cutoffs are guidelines, not rules, so a number outside them opens a question rather than proving a problem. What matters is that you can explain each result.
What does a compa-ratio of 90 mean?
The employee is paid 90 percent of the midpoint of their salary range, so 10 percent below the middle of the band. That is entirely normal for somebody who is relatively new to the role or still developing full competence in it, and it is a reasonable place for them to sit while they grow into the job. What deserves a closer look is an employee who has been fully competent for two years and is still at 90, the bottom of the conventional 90 to 110 band, because that suggests their pay has not kept pace with their capability.
What does a compa-ratio of 0.75 mean?
The same thing as 75, just expressed as a decimal rather than a percentage. The employee is paid 75 percent of the midpoint, meaning 25 percent below the middle of the range for their role. That is materially below the band and it is worth understanding why. If the person is genuinely new and still learning, it may be defensible for a period. If they are performing the job fully, it is a real gap and it is the kind of gap that ends in a resignation you did not see coming.
Where do I get the midpoint?
Take it from outside data, such as wage data from the Bureau of Labor Statistics or published job postings for the same role, and never from what you already pay. The midpoint is the middle of the salary range you have set for a role, so you need a range first, and without one you cannot calculate compa-ratio at all. This is the actual hard part, and most articles about compa-ratio skip it entirely. More and more states make employers publish pay ranges in job postings, which turns those postings into a free source. Anchoring on your current pay only locks in today’s mistakes.
What is the difference between compa-ratio and range penetration?
They measure the same salary against different reference points. Compa-ratio compares a salary with the midpoint of the range. Range penetration shows where the salary sits between the minimum and the maximum, as a percentage of the whole span. Someone paid exactly the midpoint scores 100 on compa-ratio and 50 percent on range penetration, since they are halfway between the bottom and the top of the band. Range penetration also reflects how wide the band is. That makes it useful when your ranges vary a lot in width, because the same compa-ratio can mean quite different positions in a narrow band and in a wide one.
How do I calculate group compa-ratio?
There are two methods. For the average method, you work out each person’s own compa-ratio and average the results, so every employee counts equally whatever they earn. The aggregate method divides the total of all salaries by the total of all midpoints, so people in higher-paid roles pull the result toward their own ratios. Both are valid, though each answers a slightly different question: the first asks whether people are paid fairly, the second where your payroll sits against the market. On a small team the average method usually tells you more, since one or two senior roles can dominate the aggregate.
Is compensation ratio the same as compa-ratio?
In an HR context, yes: compensation ratio, comparative ratio, and compa-ratio are used interchangeably to mean the same metric. Be aware, though, that outside HR the phrase compensation ratio means something completely different in finance. There it refers to compensation expense divided by revenue, and it is used to assess how much of a firm’s income goes to paying its people. If you are reading about compensation ratios as a share of a company’s revenue, you are reading about the finance concept, not this one.
Is compa-ratio worth tracking at a small business?
Only once you have salary ranges, and the ranges are the valuable part rather than the metric. Compa-ratio is a check that runs on top of a pay structure, so if you have no structure yet, building one is the real work and the ratio comes along for free afterward. Even so, the question behind it applies at any size: is each person paid about what the role is worth, and could you justify every difference? When the team is tiny, you can answer from memory. Once several people hold the same role, you cannot, and that is when the metric starts to pay off.
Can compa-ratio reveal pay discrimination?
It can surface a pattern, and a pattern is what matters. A single low compa-ratio is a question about one person. Low compa-ratios that cluster by sex, race, or another protected characteristic are not a compensation question at all; they point to a pay equity problem with legal consequences. If you run the numbers and the low ones group by demographic, stop treating it as a comp exercise and treat it as what it is. Note also that the Equal Employment Opportunity Commission (EEOC) expects the remedy for pay discrimination to include a raise and back pay. Where the gap is between men and women, the Equal Pay Act also prohibits closing it by lowering anyone’s wages.