Monthly Turnover Rate Calculator & Formula

This calculator works out your monthly employee turnover rate as a percentage. You enter the average number of employees during the month and the number of leavers in that month; the calculator returns the turnover rate, plus the number of leavers as a share of the starting headcount if you prefer that view.

Formula

Monthly turnover rate = (Number of leavers in the month ÷ Average number of employees during the month) × 100.

Where:

• Leavers = all permanent separations during the month (resignations, retirements, dismissals, end of contract).
• Average employees = (headcount at start of month + headcount at end of month) ÷ 2, or the sum of daily headcounts divided by days in the month.

The result is a percentage. A turnover rate of 5% means that, on average, 5 out of every 100 employees left during that month.

Worked Example

Using the defaults above: average employees = 100, leavers = 5.

1. Divide leavers by average employees: 5 ÷ 100 = 0.05
2. Multiply by 100 to get a percentage: 0.05 × 100 = 5%

The monthly turnover rate is 5%. If that rate continued unchanged for 12 months, the annualized rate would be 5% × 12 = 60% (this is a simple multiplication, not a compounding calculation).

Why Monthly Turnover Matters

Monthly turnover is the most common HR metric for tracking workforce stability. Unlike annual turnover, a monthly figure lets you spot seasonal spikes, the effect of a new manager, or the aftermath of a policy change within weeks rather than at year-end.

It is also the building block for annual turnover. Many organizations calculate annual turnover by summing the monthly rates or by using the same formula with 12 months of data. The monthly view is more actionable because it is timely.

How to Get the Average Headcount Right

The average is the denominator and the most common source of error. The simplest method is (start + end) ÷ 2, but that only works well if headcount changed roughly linearly. If you had a mass hiring event mid-month, that average will be misleading.

Better methods:

• Sum the headcount at the end of each day, then divide by the number of days in the month.
• Sum the headcount at the end of each week, then divide by the number of weeks.
• Use payroll records – they already count active employees per pay period.

Whichever method you choose, be consistent from month to month. Changing the denominator method makes the trend meaningless.

Common Mistakes and Misconceptions

Counting the wrong leavers. Include all permanent separations, but exclude internal transfers, promotions, or employees on long-term leave who are still employed. If you are measuring “regrettable turnover” (high performers you wanted to keep), that is a different, more specific metric.

Using the starting headcount only. If you start the month with 100, hire 20, and 5 leave, using 100 as the denominator gives 5%, but using the average (110) gives 4.5%. The average is the standard because it accounts for the changing base.

Confusing turnover with attrition. Attrition usually refers to positions that are not filled after someone leaves. Turnover counts the departure itself, regardless of replacement.

Annualizing a single month. Multiplying by 12 assumes the rate is constant all year. That is rarely true. Use annualization only as a rough projection, not a forecast.

How to Interpret the Result

There is no single “good” turnover rate. It varies by industry, role, and region. For example, retail and hospitality often see higher monthly turnover than government or utilities. Compare your monthly figure to your own historical average, to the same month last year, or to published industry benchmarks if you have reliable data for your sector.

Also consider the context of the departures. A 5% monthly rate with 5 resignations in a company of 100 is different from the same 5% where 3 were probationary failures and 2 were layoffs. The rate tells you the size of the churn, not the cause.

When to calculate it:

• Monthly, as part of a standard HR dashboard.
• After a major event (reorganization, acquisition, new leadership).
• When comparing teams or departments of different sizes – turnover rate normalizes for size.

Limits of the Formula

This formula is simple and widely used, but it has limits. It treats all leavers equally – a 20-year veteran and a 2-week temp both count as one. It does not distinguish voluntary from involuntary departures, which often have very different causes and solutions. It also ignores the quality of the people leaving, which is why many HR teams track “regrettable turnover” separately.

For small companies, the rate can be volatile. With 10 employees, one leaver is 10% in one month and 0% the next. That is not a meaningful trend. For small workforces, consider a rolling 3-month or 6-month average to smooth out noise.

The formula also assumes the average headcount is a good representation of the exposure. If you double in size mid-month, the average may not reflect the true “at-risk” population. In that case, use daily headcounts.

Frequently Asked Questions

What is the difference between monthly and annual turnover rate? Monthly turnover is the percentage of employees who left in one month. Annual turnover is the same calculation over 12 months, usually using the average headcount for the year. They are not directly comparable unless you annualize the monthly figure, and even then the assumption of a steady rate is often wrong.

Should I include contractors or temporary staff? Only if you consistently include them in your headcount. The formula is a ratio, so the numerator and denominator must use the same definition of “employee.” Most organizations count only permanent employees, but some include fixed-term contracts. Decide once and document it.

How do I calculate the average number of employees for a month? The simplest way is (headcount at start + headcount at end) ÷ 2. For more accuracy, average the daily headcounts. If you have payroll data, use the average number of active employees per pay period.

Is a high monthly turnover rate always bad? Not necessarily. A startup may intentionally have high turnover during a pivot. A company may be shedding low performers. The rate is a signal to investigate, not a verdict. Look at voluntary vs. involuntary, and the performance of those who left.

Can I use this formula for a specific department? Yes. Just use the department’s headcount and leavers. That is often more useful than company-wide turnover, because it can reveal problem areas. Be aware that small departments will have volatile rates.

What is a typical monthly turnover rate? There is no universal number. It varies by industry, region, and economic conditions. Published benchmarks exist for some sectors, but they are not standardized. The most useful comparison is your own historical data.

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in avg | Average employees | employees | 100 | 0
in left | Leavers in month | employees | 5 | 0
out rate | Monthly turnover rate | % | left / avg * 100 | 1
out annualized | Annualized (if steady) | % | (left / avg * 100) * 12 | 1