Attrition Rate

TL;DR: Attrition rate is the percentage of employees who leave your company over a set period. To calculate it, divide the number of employees who left during that period by your average headcount, then multiply by 100. But the useful part isn’t just getting the number—it’s analyzing it by team, role, tenure, exit type, and trend before deciding you have a retention problem. And then putting that information to work.

You came here for a clear answer: Is our attrition high? Are we losing people too quickly? Is this normal, or is something broken?

The answer depends on how you define the metric, which period you measure, and what you compare it against.

Think of attrition rate as a dashboard warning light. It tells you to look closer, but it doesn’t tell you the whole repair bill.

In this guide, we’ll cover:

• What attrition rate means
• Why attrition rate matters
• How to calculate attrition rate
• How to interpret your attrition rate
• What attrition rate can—and can’t—tell you
• How to use attrition rate alongside recruiting metrics
• Common mistakes
• Frequently asked questions

What Attrition Rate Means

In plain English, attrition rate measures the share of employees who leave your company during a specific period. That period might be a month, quarter, or year, depending on how your team reports workforce changes.

Attrition and turnover are often used interchangeably, but some organizations define them differently. For example, they may use “attrition” when vacated roles aren’t immediately backfilled and “turnover” when departures create replacement hiring.

The safest approach is to choose a definition and document it.

Before calculating attrition, decide what counts:

• Time period: Count only exits that occur within the period you’re measuring.
• Employee population: Define whether you’re measuring all employees, full-time employees, one location, one department, or a specific role family.
• Voluntary exits: Decide whether resignations are included.
• Involuntary exits: Determine whether terminations, layoffs, and contract endings belong in the same report or should be measured separately.
• Internal moves: Don’t count internal transfers unless the employee fully leaves the population you’re measuring.
• Future-dated exits: Don’t count someone who has given notice until their exit date falls within the reporting period.

This is where teams often get tripped up. If HR, finance, and recruiting each use a different definition, meetings can turn into arguments about the math instead of discussions about what changed.

Why Attrition Rate Matters

Attrition rate isn’t just an HR metric tucked away in a spreadsheet. When people leave faster, hiring plans become heavier, managers lose continuity, and teams spend more time replacing knowledge than building momentum.

When attrition changes, review it through four lenses:

• Workforce planning: Does the current headcount plan still match the work that needs to get done?
• Manager and team health: Is attrition spread across the company or concentrated in certain teams, roles, or manager groups?
• Hiring volume: How many open roles are replacements rather than growth positions?
• New-hire retention: Are people leaving shortly after joining, or is the issue concentrated among longer-tenured employees?

Early attrition can point to problems with job expectations, onboarding, hiring-manager alignment, or the recruiting process itself. If you’re already investigating a high turnover rate, attrition provides another way to identify where pressure is building.

Use attrition as a signal to investigate—not as a verdict on company culture. One number can tell you that something moved, but it can’t explain why without further analysis.

How to Calculate Attrition Rate

To calculate attrition rate, keep the reporting period and employee population consistent from start to finish.

Follow these steps:

1. Choose the reporting period. Select a month, quarter, year, or custom window.
2. Count exits during that period. Include only employees who left within the window, based on your documented definition.
3. Calculate average headcount. A simple method is to add beginning and ending headcount, then divide by two.
4. Apply the formula. Divide exits by average headcount.
5. Convert the result into a percentage. Multiply by 100.

Attrition rate formula

Attrition rate = (Number of employees who left ÷ Average headcount) × 100

Monthly Attrition Example

Suppose five employees left in May:

• Headcount on May 1: 240
• Headcount on May 31: 260
• Average headcount: (240 + 260) ÷ 2 = 250
• Attrition rate: (5 ÷ 250) × 100 = 2%

Quarterly Attrition Example

Suppose 18 employees left during the second quarter:

• Headcount at the start of Q2: 600
• Headcount at the end of Q2: 630
• Average headcount: (600 + 630) ÷ 2 = 615
• Attrition rate: (18 ÷ 615) × 100 = 2.9%

In both examples, ending headcount is higher than starting headcount even though people left. That’s because new hires outnumbered exits during the period. Attrition counts departures only, so headcount can grow while attrition is still above zero.

Some organizations use more detailed average-headcount methods, especially when the workforce changes significantly during the reporting period. That’s fine. The key is consistency: Use the same formula, period, and employee population each time so your trend data remains meaningful.

How to Interpret Your Attrition Rate

Once you have the number, the next question is usually: Is this good or bad?

Start with your organization’s context before reaching for a universal benchmark. A 10% annual attrition rate means something very different from a 10% monthly rate. The same rate can also have different implications across functions, tenure bands, locations, and role types.

Use the following questions to interpret your results:

What Does a 10% Attrition Rate Mean?

A 10% attrition rate means 10 out of every 100 employees in the measured population left during the selected period.

Whether that’s concerning depends on:

• The reporting period
• Your historical trend
• The teams or roles affected
• Employee tenure
• Whether exits were voluntary or involuntary

Is a 20% Attrition Rate High?

It might be, but the number shouldn’t be assessed in isolation.

First ask:

• Is it an annual, quarterly, or monthly rate?
• Is it concentrated in one employee group?
• Is it above your organization’s historical range?
• What types of exits are included?
• Are the departing employees difficult to replace?

You’ll often learn more by comparing the current period with your own historical data. External benchmarks can help, but only when they reflect a similar industry, workforce, and role mix.

What Attrition Rate Can (and Can’t) Tell You

The formula is useful, but it isn’t enough to diagnose a retention problem.

If your attrition rate changes, don’t jump to a company-wide conclusion. Analyze the data further to understand where the change is coming from.

Use this diagnostic checklist:

• Voluntary vs. involuntary: Separate employees who chose to leave from exits initiated by the company.
• Regrettable vs. non-regrettable: Identify whether you lost employees the organization was actively trying to retain.
• Tenure band: Compare new hires, mid-tenure employees, and long-tenured employees.
• Department, manager, or location: Look for clusters instead of assuming the issue affects the entire company.
• Performance band: Determine whether exits are concentrated among top performers, low performers, or a mix.
• New-hire attrition: Review whether employees are leaving within their first year or another early-tenure period your team tracks.
• Exit-reason themes: Group exit feedback into themes such as compensation, manager relationships, career growth, workload, flexibility, or role mismatch.

The same overall attrition rate can hide two very different situations. You may have broad, low-level churn across the company, or one team may be losing employees rapidly while the rest of the organization remains stable.

Attrition rate tells you where to look next—not why people are leaving. If career growth repeatedly appears as an exit theme, for example, a retention strategy such as job crafting may be worth exploring with managers.

How to Use Attrition Rate Alongside Recruiting Metrics

When attrition rises, recruiting usually feels the impact next: more backfills, more urgent requisitions, greater pressure from hiring managers, and more questions about whether the company is hiring the right people. It helps to know what each early exit really costs before those conversations start.

Review attrition alongside recruiting data in a dashboard such as this:

If you already track talent acquisition metrics, attrition should be part of the same conversation. It connects recruiting outcomes with what happens after candidates accept an offer.

That comparison is easier when the data lives in one place. Attrition figures often sit in an HR system while time to fill, offer acceptance, and source data sit in recruiting tools, so teams end up stitching reports together by hand. A recruiting platform with built-in dashboards can put those hiring signals side by side.

The goal isn’t to make one dashboard do everything. It’s to place attrition alongside the hiring signals that help your team decide what to do next.

Common Attrition-Rate Mistakes

Attrition rate looks simple, which makes it easy to misuse. Before presenting the number to leadership, check for these common mistakes.

Treating Attrition and Turnover as Interchangeable

If your organization uses both terms, document what each one means. Otherwise, different teams may calculate or interpret them differently.

Changing the Formula or Employee Population

If the calculation or measured population changes between reports, you can’t trust the resulting trend line.

Labeling a Rate “High” Without Context

Review the timeframe, historical trend, role type, and team concentration before deciding whether a rate is concerning.

Using One Spike to Diagnose Company Culture

A sudden increase tells you to investigate. It does not prove the cause or confirm a company-wide cultural issue.

Looking at Exits in Isolation

Attrition becomes more useful when paired with metrics such as time to fill, offer acceptance, new-hire retention, source quality, and hiring-manager feedback.

If a discussion gets stuck on whether the number “looks bad,” return to the underlying segments. Asking where and when exits are happening is more productive than debating an overall rate in isolation.

Frequently Asked Questions

What Does Attrition Rate Mean?

Attrition rate is the percentage of employees who leave a company during a set period. It’s typically calculated by dividing the number of employees who left by the average headcount for the same period, then multiplying by 100.

You can measure attrition monthly, quarterly, annually, or for a specific population such as a department, location, or role family.

What Does a 10% Attrition Rate Mean?

A 10% attrition rate means 10 out of every 100 employees in the measured population left during the selected period.

The timeframe matters. A 10% annual attrition rate is very different from a 10% monthly rate. You should also determine whether departures are concentrated within a particular team, role, location, or tenure group.

Is 20% Attrition High?

A 20% attrition rate may be high, but there is no universal answer. First confirm the timeframe, employee population, and exit types included.

Then compare the result with your organization’s historical trend. If you use external benchmarks, make sure they reflect a similar industry, workforce, and role mix.

What Does an 80% Attrition Rate Mean?

An 80% attrition rate means 80 out of every 100 employees in the measured population left during the selected period.

That indicates significant employee loss, but the period and population still matter. For example, 80% attrition among a small group of seasonal workers means something different from 80% annual attrition across a company’s full-time workforce.

How Do You Calculate Attrition Rate?

Divide the number of employees who left during a period by the average headcount for the same period, then multiply by 100.

For example, if five employees left and the average headcount was 250:

(5 ÷ 250) × 100 = 2% attrition

Using average headcount helps ensure the denominator reflects workforce changes during the period.

How Does Lever Help You Track and Interpret Attrition-Related Metrics?

Lever brings hiring data into one place through dashboards and reporting, so recruiting leaders can review activity, outcomes, and trends without chasing information across scattered reports.

Two views are especially useful here. The return on investment (ROI) dashboard focuses largely on first-year attrition and quality-of-hire metrics, which helps you see whether recent hires are staying and succeeding. The Talent Leader Summary dashboard shows internal mobility against attrition, so you can read departures alongside moves within the company.

Lever combines applicant management and candidate relationship building with configurable workflows, more than 400 integrations, and reporting designed to connect hiring activity with business impact.

From One Number to Better Questions

The goal isn’t to label attrition as “high” or “low.” It’s to ask the right next question before acting.

Define the metric, calculate it consistently, and analyze it by trend, team, role, tenure, and exit type. That’s how one dashboard warning light turns into a better workforce plan.

Ready to keep hiring data visible and useful in one place? See how Lever helps teams connect recruiting activity, dashboards, and reporting without losing the story behind the numbers.