Employee departures are a normal part of business. People resign, retire, relocate, change careers, or move on to new opportunities. However, when employees start leaving frequently, it can become a serious challenge for any organisation.
This is where understanding staff turnover and how to calculate it becomes important.
Many employers know they are losing employees, but few actually measure the rate at which it is happening or understand what those departures are costing the business. By calculating staff turnover, organisations can identify workforce trends, uncover retention issues, and make better decisions about hiring and employee engagement.
In this article, we'll explain what staff turnover means, how to calculate it, why it matters, and what businesses can do to reduce it.
Staff turnover refers to the rate at which employees leave an organisation and are replaced over a specific period of time. When an employee resigns, retires, is dismissed, or leaves for any reason, it contributes to staff turnover.
A certain level of turnover is expected in every organisation. However, consistently high turnover can indicate deeper issues such as poor management, lack of career growth opportunities, inadequate compensation, or low employee satisfaction.
According to our latest resource, the HR Leader's Playbook for Managing Japa-Driven Attrition, employee exits have become an increasing challenge for Nigerian organisations, particularly as many skilled professionals pursue opportunities abroad. Our guide notes that attrition is no longer a background HR issue but an active operational challenge for many businesses.
Many organisations only notice turnover when key employees leave. Unfortunately, by then, the damage may already have been done.
Tracking turnover helps organisations:
Most importantly, it helps HR teams make decisions based on data rather than assumptions.
As highlighted in our guide, organisations should track voluntary attrition rates, regrettable attrition rates, time-to-fill vacancies, and employee flight risks regularly as part of a comprehensive attrition dashboard.
Calculating staff turnover is relatively straightforward. All you need is the formula, which is:
Staff Turnover Rate (%) = (Number of Employees Who Left During the Period ÷ Average Number of Employees During the Period) × 100
Example
Let's assume a company had:
Step 1: Calculate Average Number of Employees
Average Employees = (100 + 120) ÷ 2
Average Employees = 110
Step 2: Apply the Formula
Staff Turnover Rate = (20 ÷ 110) × 100
Staff Turnover Rate = 18.18%
This means the organisation experienced a staff turnover rate of approximately 18% during the year.
There is no universal benchmark because turnover rates vary by industry, location, and business size.
For example:
Our guide gives a breakdown of different sectors with particularly high exposure to employee migration and attrition.
Rather than comparing yourself with every other organisation, focus on your own trends over time. If your turnover rate is increasing year after year, it deserves attention.
One of the biggest mistakes organisations make is underestimating how expensive employee departures can be. Many employers think turnover costs only involve recruitment expenses. In reality, the cost is much higher. From our experience recruiting for hundreds of organisations, the true cost of employee turnover includes:
Our guide notes that replacing a mid-level employee can cost between 100% and 150% of their annual salary, while senior positions can cost significantly more. This means that reducing turnover is not just an HR goal. It is a business performance strategy.
Employees leave organisations for many reasons, including:
When employees cannot see a future within the organisation, they often begin looking elsewhere. Research highlighted in the MyJobMag guide shows that employees with clear career development opportunities demonstrate significantly higher retention rates.
One of the most overlooked drivers of turnover is management quality. Employees often leave managers rather than companies. Poor communication, micromanagement, lack of recognition, and disrespectful treatment can quickly drive valuable employees away.
Employees want to feel fairly rewarded for their work. If salaries fail to keep pace with economic realities, retention becomes more difficult.
Flexible and hybrid work arrangements have become increasingly important. Employees often value flexibility as much as compensation.
Employees are more likely to stay where they feel respected, recognised, and connected to a meaningful mission. Strong workplace culture remains one of the most effective retention tools available.
If your organisation is experiencing high turnover, consider the following actions:
Don't wait until employees resign before asking for feedback. We recommend conducting regular "stay interviews" to understand what employees value and what may be causing them to consider leaving. To provide you with further insights on how to navigate this, we made a stay interview template in our guide, just for you. Download now to get access to your stay interview template.
Employees should know what growth opportunities exist and what they need to do to progress.
Train managers on communication, coaching, feedback, and leadership skills.
Recognising employee contributions regularly can significantly improve engagement and retention.
Create an environment where employees feel respected, supported, and heard.
Understanding staff turnover and how to calculate it is one of the most important workforce metrics any organisation can track. Calculating turnover helps businesses identify retention problems early, understand workforce trends, and make better decisions about recruitment, employee engagement, and workforce planning.
More importantly, reducing unnecessary turnover can save high costs, improve productivity, and strengthen organisational performance.
If you're an HR professional, business owner, or people manager looking to better understand employee retention, workforce planning, and managing attrition in today's labour market, download The HR Leader's Playbook for Managing Japa-Driven Attrition.
The guide includes practical retention strategies, attrition dashboards, workforce planning frameworks, stay interview templates, succession planning tools, and an attrition cost calculator designed specifically for Nigerian organisations.
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