Employee Retention Rate Calculation

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Employee Retention Calculator

Calculate your workforce stability and turnover rates accurately.

Please enter valid positive numbers. Start count must be greater than zero.
Retention Rate –%
Turnover Rate –%
Total Separations (Leavers)

What is Employee Retention Rate?

Employee Retention Rate is a critical Human Resources metric that measures the percentage of employees who remain with an organization over a specific period. Unlike turnover, which focuses on who left, retention focuses on the stability of your existing workforce. It is a key indicator of company culture, job satisfaction, and organizational health.

How to Calculate Retention Rate

While there are several ways to approach this metric, the standard formula used by HR professionals isolates the original cohort of employees to see how many stayed. The formula is:

Retention Rate = ((Total Employees at End – New Hires) / Total Employees at Start) × 100

Example Calculation:

  • Start Headcount: 100 employees
  • End Headcount: 95 employees
  • New Hires: 10 employees

First, calculate how many of the original 100 remain: 95 (End) – 10 (New) = 85 retained employees.
Then, divide by the start count: 85 / 100 = 0.85.
Finally, multiply by 100 to get the percentage: 85% Retention Rate.

Retention vs. Turnover

This calculator provides both metrics because they tell different sides of the same story:

  • Retention Rate: Measures stability. It answers "How many of my original team are still here?" High retention suggests a stable work environment.
  • Turnover Rate: Measures the velocity of departures relative to the average workforce size. It answers "How quickly are people leaving?"

Why Monitoring Retention Matters

High employee retention saves money on recruitment and training, preserves institutional knowledge, and generally boosts morale. Conversely, low retention (high turnover) can indicate issues with management, compensation, or workplace culture that need immediate attention.

function calculateRetention() { // Get input values var startEmp = document.getElementById('startEmployees').value; var endEmp = document.getElementById('endEmployees').value; var newHires = document.getElementById('newHires').value; var errorDiv = document.getElementById('errorMsg'); var resultsDiv = document.getElementById('results'); // Reset display errorDiv.style.display = 'none'; resultsDiv.style.display = 'none'; // Validate inputs if (startEmp === " || endEmp === " || newHires === ") { errorDiv.innerText = "Please fill in all fields."; errorDiv.style.display = 'block'; return; } // Parse to numbers var s = parseFloat(startEmp); var e = parseFloat(endEmp); var n = parseFloat(newHires); // Logical validation if (isNaN(s) || isNaN(e) || isNaN(n) || s <= 0 || e < 0 || n < 0) { errorDiv.innerText = "Please enter valid positive numbers. 'Employees at Start' must be greater than 0."; errorDiv.style.display = 'block'; return; } // Calculation Logic // 1. Calculate Separations (Leavers) // Formula: Start + New Hires – End = Separations var separations = s + n – e; if (separations < 0) { errorDiv.innerText = "Data Error: Ending count is too high for the given start and new hire counts. Please check your numbers."; errorDiv.style.display = 'block'; return; } // 2. Calculate Retention Rate // Formula: ((End – New Hires) / Start) * 100 // Note: (End – New Hires) represents the number of employees from the START group who are still there. var retainedEmployees = e – n; // Edge case: if retained is negative (more new hires than end count), data is invalid if (retainedEmployees 0) { turnoverRate = (separations / averageEmployees) * 100; } // Display Results document.getElementById('retentionResult').innerText = retentionRate.toFixed(1) + "%"; document.getElementById('turnoverResult').innerText = turnoverRate.toFixed(1) + "%"; document.getElementById('leaversResult').innerText = separations; resultsDiv.style.display = 'block'; }

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