Turnover Rate Formula: How to Calculate It

This calculator works out your employee turnover rate for a given period. You enter the number of employees at the start and end of the period, plus how many left during that time, and it returns the turnover rate as a percentage. It also shows the average number of employees, which the formula is based on.

Formula

The standard turnover rate formula is:

Turnover Rate = (Number of Employees Who Left ÷ Average Number of Employees) × 100

Where:

• Number of Employees Who Left – the total number of separations during the period (resignations, terminations, retirements, etc.)
• Average Number of Employees – usually calculated as (Employees at Start + Employees at End) ÷ 2

The result is expressed as a percentage. For example, a turnover rate of 12% means that, on average, 12 out of every 100 employees left during the period.

Worked Example

Let’s use the default values from the calculator above:

• Employees at start: 100
• Employees at end: 95
• Employees who left: 10

Step 1: Calculate the average number of employees.

Average = (100 + 95) ÷ 2 = 195 ÷ 2 = 97.5

Step 2: Divide the number who left by the average.

10 ÷ 97.5 = 0.10256…

Step 3: Multiply by 100 to get a percentage.

0.10256 × 100 = 10.3% (rounded to one decimal place)

So the turnover rate is 10.3% for that period.

When to Use This Formula

Use this formula when you need a straightforward measure of how many employees left your organization relative to your average headcount over a specific time frame, such as a month, quarter, or year. It is the most common way to report turnover and is useful for tracking trends over time, comparing departments, or benchmarking against industry averages.

The formula works best when the period is not too short (e.g., at least a month) and when your headcount does not fluctuate wildly. For very volatile periods, a more detailed calculation using monthly averages may be more accurate.

How to Read the Result

A higher percentage means more employees are leaving relative to your average workforce. A lower percentage indicates more stability. However, there is no single “good” number – it varies widely by industry, role, and economic conditions. For example, retail and hospitality often have higher turnover than government or education. The key is to track your own rate over time and see if it is rising or falling.

Also note that the formula counts all separations, including voluntary resignations, layoffs, and retirements. If you want to focus on voluntary turnover (people who chose to leave), you would only count those who resigned voluntarily.

Common Mistakes

• Using the ending headcount instead of the average. This is a common error. The average gives a more balanced view because it accounts for changes during the period.
• Forgetting to multiply by 100. The raw division gives a decimal (e.g., 0.103). You must convert it to a percentage by multiplying by 100.
• Counting contractors or temporary staff inconsistently. Decide upfront whether you include them and be consistent across periods.
• Using different time periods. If you compare turnover rates, make sure they are for the same length of time. A monthly rate and an annual rate are not directly comparable.
• Rounding too early. Keep full precision until the final step, then round to one or two decimal places.

Tips

• Always define the period clearly (e.g., “Q1 2025” or “Fiscal Year 2024”).
• Use the same formula every time so your trend data is consistent.
• If your headcount changes significantly mid-period, consider using the average of monthly headcounts instead of just start and end.
• Separate voluntary and involuntary turnover if you need deeper insight – the overall rate can hide important differences.
• Track turnover by department or role to identify problem areas.

Limitations of the Formula

This simple formula assumes a linear change in headcount, which may not be true if you hire or lose many people in a short burst. It also does not distinguish between different types of departures or account for the cost of turnover. For a more detailed analysis, you might calculate retention rate (the percentage of employees who stay) or look at turnover by tenure.

Troubleshooting

My result seems too high or too low. Check that you entered the correct numbers. A common mistake is entering the number of hires instead of the number who left. Also verify that your start and end headcounts are for the same period.

I get a negative number. That should not happen with this formula – all inputs are positive. If you see a negative, you likely entered a negative number for one of the inputs.

My average is a decimal. That’s fine. The average number of employees does not have to be a whole number.

I’m comparing to a published industry rate. Make sure the published rate uses the same calculation method. Some sources use a different denominator, such as total employees at the end of the period.

Frequently Asked Questions

Q: What is a good turnover rate?
A: It varies by industry. For example, retail and hospitality often see 30–60% annually, while professional services might be 10–15%. Compare your rate to your own past data and industry benchmarks.

Q: Should I include interns and part-time workers?
A: It depends on your goal. If you want a full picture, include all employees. If you want to focus on core staff, exclude temporary or seasonal workers. Just be consistent.

Q: How do I calculate annual turnover from monthly data?
A: You can either sum the monthly turnover rates (not exactly correct) or calculate the annual rate using the formula with start-of-year and end-of-year headcounts and total departures for the year. The latter is more accurate.

Q: What is the difference between turnover rate and retention rate?
A: Turnover rate measures how many employees left as a percentage of average headcount. Retention rate measures how many employees stayed over a period, usually calculated as (Employees at End – New Hires) ÷ Employees at Start × 100.

Q: Can I use this formula for a single department?
A: Yes. Just use the department’s start/end headcount and the number who left from that department. The same formula applies.

Q: What if I don’t know the number of employees at the end?
A: You need both start and end headcounts to use the average. If you only know start and the number who left, you can estimate end headcount as start minus left, assuming no hires. But that may not reflect reality if you hired during the period.

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in start | Employees at start | - | 100 | 0
in end | Employees at end | - | 95 | 0
in left | Employees who left | - | 10 | 0
out avg | Average employees | - | (start + end) / 2 | 1
out rate | Turnover rate | % | (left / avg) * 100 | 1