Employee Retention Rate: Formula and Worked Examples

Your employee retention rate shows how many people from a defined starting workforce are still employed at the end of a period. To calculate it clearly, count the employees who were there at the beginning, check which of those same people remain, then divide the remaining number by the starting number and multiply by 100.

The important phrase is “those same people”. A growing team can have more employees at the end of a quarter while losing experienced staff along the way. This guide explains a starting-cohort method, with fictional examples, so employers can measure that difference and decide what to investigate.

Employee retention rate formula

Here, a cohort simply means a defined group of people. Your starting cohort could be the whole company, one department or a particular intake. Write down the group and the dates before running the calculation.

If 46 of the 50 employees present at the beginning of a quarter remain at its end, retention is 46 ÷ 50 × 100 = 92%. Four of the starting employees have left. People who joined after the start date are measured separately.

Give the measure a precise label, such as “starting-workforce retention, 1 January to 31 March”. A percentage without the period and population can be misleading, especially when another report uses a different method.

Worked example: a growing company with new hires

The following figures are illustrative and are not Begory or client results. Imagine an employer starts a quarter with 80 employees, recruits 20 more and ends with 90.

The starting-workforce retention rate is 72 ÷ 80 × 100 = 90%. Growth in total headcount does not change that result.

Dividing the ending headcount by the starting headcount would give 90 ÷ 80 = 112.5%. That is a headcount comparison, not a retention rate. It mixes people hired during the quarter with the original workforce.

Another common mistake is to subtract every new hire from the ending total: (90 − 20) ÷ 80 = 87.5%. That is wrong in this example because two new hires have already left. If you use an ending-headcount shortcut, subtract only new hires who are still included in that ending count. Checking employee IDs against the starting list is clearer.

How to measure employee retention consistently

1. Set the reporting period and population

Choose a monthly, quarterly or annual period that serves your decision. Define whether the report covers the whole employer, a department, a workplace or a hiring intake. Do not compare an annual rate with a monthly one as though the exposure period were the same.

2. Create the starting list

Take a dated list of employee IDs included at the start. Keep an agreed rule for employee status and use it consistently. For example, decide how the report treats employees on leave, temporary assignments and fixed-term arrangements. Do not assume that absence from a particular shift means employment has ended.

3. Match those people to the end date

Check which starting employees remain employed at the end. An internal move may count as retained in a company-wide report but as a departure from a department. For rehires, record the employment break and state whether you measure continuous employment or presence at the end date. The two questions can produce different answers.

4. Reconcile movements before reporting

Check that starting headcount plus joiners minus leavers explains the ending headcount under the same counting rules. Investigate duplicate IDs, missing end dates and inconsistent transfer records. If the starting cohort is empty, report retention as not applicable rather than dividing by zero.

A practical record can include employee ID, start date, end date where applicable, team, employment type and an agreed departure category. Restrict access to individual records and share aggregated results with managers who need them.

Retention and turnover answer different questions

Retention asks who stayed from the group you selected. Turnover asks about departures, and a turnover report may include employees who both joined and left during the period. In the example above, eight original employees and two new employees left, while the retention calculation concerns only the original 80.

Do not automatically calculate one measure as 100 minus the other. They are complements only when their population, departure rules and denominator are aligned. Document the formula for each report so a manager can understand the difference.

The CIPD factsheet on turnover and retention treats measurement and understanding why people leave as connected parts of workforce management. A rate is a starting point for investigation, rather than an explanation on its own.

Track new-hire retention separately

Starting-workforce retention can miss problems among recent recruits. ADP’s explanation of retention measures highlights that employees who join and leave within the same reporting period can be overlooked in a starting-workforce view.

For a 90-day new-hire measure, define an intake and count how many members remain employed at their individual 90-day point. Include only people who have reached that point by the reporting cut-off.

For example, if all 12 people in a January intake have completed their 90-day observation window and nine remain, that intake’s 90-day retention is 9 ÷ 12 × 100 = 75%. Do not add February starters who have not yet had 90 days of exposure. Track their intake when its observation window is complete.

Review early departures alongside the approved role description, interview notes and induction plan. Was the shift pattern explained? Did the role match the work discussed? Was the manager ready for the new starter? These are questions to investigate, not conclusions the percentage can prove.

What is a good employee retention rate?

There is no single percentage that makes every workforce healthy. A seasonal operation, a growing technical team and a stable long-service department have different staffing patterns. Compare equivalent periods and groups first, then use external benchmarks only when their definitions are comparable.

For a team of ten, one departure changes retention by ten percentage points. Show the count as well as the rate so small groups do not appear more conclusive than they are. Avoid setting a target of zero departures without considering planned contract completions or the organisation’s needs.

For international recruitment, analyse destination, role and employment arrangement where the groups are meaningful. Do not use nationality as a substitute for understanding working conditions, management, expectations or individual reasons for leaving.

Use employee retention metrics to decide what to review

Keep the management view short: reporting dates, cohort size, retained count, retention percentage, departures by agreed category and the comparable previous period. Add a separate new-hire measure when early attrition is relevant.

Then choose an action based on evidence:

• Departures during induction: Check the handover from recruitment, supervisor availability and training arrangements.
• Reported pay concerns: Review payslips, approved terms and how questions are resolved. Employers operating locally can review the scope of payroll services in Egypt.
• Role mismatch: Compare the advertised duties with the actual job and agree changes before another hiring round.
• Concentrated departures in one team: Review workload and management with appropriate context, rather than assuming one cause from a small sample.

Assign an owner and a review date to the action. A later improvement in retention may have several causes, so record what changed and avoid presenting a simple before-and-after comparison as proof that one initiative caused the result.

Questions employers often ask

Should seasonal employees be included?

State the scope clearly. A whole-workforce measure can include them, while a separate view can show planned seasonal completions. Avoid removing departures after seeing the result just to improve the reported percentage.

Can employee retention exceed 100%?

Not for the starting-cohort method described here. If it does, check whether new hires, duplicated records or a different population have entered the numerator.

Does a high rate mean employees are satisfied?

It does not establish that. Use the measure with employee feedback, absence information, performance context and the reasons people give for staying or leaving.