Attrition rate
Also known as: Natural attrition, Employee attrition
Attrition rate is the percentage of employees who leave a company over a defined period through any means — voluntary resignations, retirements, terminations, deaths, role eliminations. In strict usage, attrition specifically refers to departures whose positions are NOT refilled (workforce reduction by natural means). In common usage, "attrition" and "turnover" are used interchangeably.
The distinction between attrition and turnover matters more in HR-technical contexts than in everyday business conversation. Technically, attrition = departures that shrink the workforce (positions not refilled); turnover = departures whose positions ARE refilled (cycling through people without reducing headcount). In practice, most companies and dashboards use the terms as synonyms — so always clarify which definition is in use.
How attrition rate is calculated
Attrition rate = (Departures during period ÷ Average headcount during period) × 100. Same formula as turnover; the distinction is conceptual rather than mathematical. Track annually for the headline number; quarterly or rolling 12-month for trend detection.
Healthy ranges (knowledge work)
- Below 8% — very low; possibly stagnant; watch for performance issues
- 8-12% — healthy in mature companies
- 12-18% — typical for high-growth tech
- Above 20% — elevated; investigate by segment
- Above 25% — usually signals comp, culture, or leadership issues
Attrition segments to watch
- Regrettable attrition — high-performer + early-tenure departures (the expensive kind)
- Voluntary vs involuntary — employee-initiated vs company-initiated
- By tenure cohort — first 90 days, 1 year, 2-3 years, 5+ years
- By manager — find the 1 manager whose direct reports leave 3x the company rate
- By function — engineering, sales, support — different reasons, different fixes
Frequently asked questions
- Is attrition the same as turnover?
- Often used interchangeably. Strictly: attrition = workforce reduction (positions not refilled). Turnover = departures whose positions ARE refilled. In daily usage, most companies use the terms as synonyms.
- What's a healthy attrition rate?
- 8–12% for mature companies, 12–18% for high-growth tech. Above 20% usually indicates problems worth investigating by segment.
- What is regrettable attrition?
- Departures of employees the company wanted to keep — typically high-performers and early-tenure staff. Regrettable attrition matters more than total attrition for predicting actual business pain.
- How fast can attrition signal problems?
- Track the rolling 6-month trend. A 5+ percentage-point increase quarter-over-quarter is a fire alarm. Investigate by team, manager, and exit-interview reasons before the trend compounds.