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Employee Attrition Percentage Calculator

Measure departures against average staffing during a reporting period.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

Divide employees who left by the average of beginning and ending employee counts. The result summarizes a period; it does not explain why people left or predict future staffing.

Attrition (%) = departures ÷ ((starting employees + ending employees) ÷ 2) × 100

Worked example

Enter these known values and leave the other values blank.

Employees at the start
100
Employees at the end
120
Employees that left
11
Attrition rate
10 %

Assumptions and limitations

  • Inputs describe one consistent reporting period. Review the formula and counting conventions before comparing results.

Common questions

Why use an average employee count?

An average reduces the distortion from using only the starting or ending count when staffing changes. Large changes within the period may call for a more detailed average.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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