Retention rate and attrition rate are complementary metrics that measure the same phenomenon from opposite perspectives. Attrition rate measures losses; retention rate measures stability. The standard formula is: (Employees who stayed throughout the period ÷ Starting headcount) × 100.
Where attrition rate is useful for understanding the replacement hiring burden, retention rate is more useful for tracking the effectiveness of retention initiatives — a year-over-year improvement from 78% to 85% retention is a clearer signal of programme success than comparing attrition percentages.
Retention rate is most valuable when segmented by dimensions that reveal where retention is strong and where it is weak. Retention by performance tier — are high performers staying at the same rate as average performers? — reveals whether the organisation is retaining its most strategic talent. Retention by tenure cohort — what percentage of employees hired 12 months ago are still with the organisation? — reveals onboarding and early engagement effectiveness. Retention by manager — do certain managers have significantly lower retention in their teams? — reveals management effectiveness variation.
New hire retention (typically measured at 90 days and 12 months) is a particularly important subset. Employees who leave within 90 days typically do so due to expectation mismatch (the role or culture wasn't what was presented) or poor onboarding. Employees who leave between 12 and 24 months typically do so due to career development limitations, compensation progression, or management issues. Each departure window has a different root cause and requires a different intervention.
Key Points: Retention Rate
- Standard formula: (Employees retained ÷ Starting headcount) × 100 = retention rate.
- Performance segmentation: Tracking retention by performance tier reveals whether the organisation is retaining its most strategically important employees.
- New hire retention: 90-day and 12-month retention are leading indicators of onboarding quality and early engagement effectiveness.
- Manager variation: Retention rates by manager reveal management effectiveness differences that individual performance data alone doesn't capture.
- Programme evaluation: Year-over-year retention rate changes measure the effectiveness of retention-focused interventions.
How Retention Rate Works in Treegarden
Retention Rate in Treegarden
Treegarden tracks employee tenure and departure data within the HR module, enabling retention rate calculation by department, manager, hire cohort, and role type. The integration of ATS hiring data with HR retention outcomes creates a closed loop: recruiters can see whether the candidates they hired from specific sources, pipelines, or processes are staying longer or leaving sooner than average, enabling evidence-based sourcing and process improvements.
Related HR Glossary Terms
Frequently Asked Questions About Retention Rate
Retention rate is calculated over a defined measurement period — typically a month, quarter, or year. The formula is: (Number of employees who were employed both at the start and the end of the measurement period ÷ Number of employees at the start of the measurement period) × 100. For example, if you had 200 employees at January 1st and 170 of those same employees are still employed at December 31st (regardless of total headcount changes due to new hires), your retention rate for the year is 170 ÷ 200 × 100 = 85%. This formula measures the stability of your original employee population, not the total headcount change. New hires made during the measurement period are typically excluded from the retention calculation — they are included in the following period's retention measurement.
Healthy retention rate benchmarks vary by industry and role type in the same way attrition rate benchmarks do. For professional services, technology, and finance organisations, retention rates of 80-90% annually (10-20% attrition) are typical; rates above 90% in these sectors suggest strong retention performance. In retail, hospitality, and call centre environments, retention rates of 50-70% annually may reflect typical market conditions rather than poor retention practice. New hire 90-day retention rates below 85-90% typically indicate onboarding problems that are worth investigating. New hire 12-month retention below 75% is a significant signal requiring root cause analysis of why new hires are leaving within their first year. Context and trend matter more than absolute numbers — improving retention by 5 percentage points year-over-year is a meaningful achievement regardless of the absolute level.
Compensation is consistently among the top three reasons employees cite for voluntary departure, and maintaining market-competitive compensation is a necessary but not sufficient condition for strong retention. 'Necessary but not sufficient' is the key framing: employees who are below-market in compensation will leave when they discover the gap, but employees who are at-market will not necessarily stay if other retention factors (career development, management quality, culture, flexibility) are weak. Compensation benchmarking — comparing your salary bands to market data annually — prevents the slow drift below market that occurs when pay is not reviewed against external data. Equity and transparency in compensation are also increasingly important: employees who perceive that compensation is arbitrary or unfair are more likely to leave even when their individual pay is competitive.
Management quality is one of the most significant controllable drivers of employee retention, reflected in the enduring HR aphorism that 'people leave managers, not companies.' Research on retention drivers consistently finds that the relationship with the direct manager is a top-three factor in both staying and leaving decisions. Specific management behaviours associated with higher retention include: regular, meaningful one-on-one conversations where the manager genuinely understands the employee's situation, goals, and concerns; recognition of contributions; active career development support including stretch assignments and promotion advocacy; and management of workload and wellbeing. Manager effectiveness can be measured through direct reports' engagement survey scores, and managers with consistently below-average scores in their team's retention represent the clearest intervention target for improving organisational retention rates.