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Overtime Planning Retention Impact Estimator

The Overtime Planning Retention Impact Estimator approximates how a change in employee turnover associated with an overtime plan could affect retained headcount and replacement cost. It is designed for workforce planning scenarios where managers want to compare a current turnover rate with a projected rate after changing overtime practices, such as reducing chronic overtime, improving scheduling fairness, or redesigning staffing coverage.

The estimator converts the turnover-rate difference into expected departures avoided or added across the workforce. It then applies an optional replacement cost per departure to show the financial scale of that change. The result is a scenario estimate, not proof that overtime caused the retention change; other factors such as pay, management, workload, labor-market conditions, and career opportunities can also influence turnover.

Retention scenario inputs

people
%
%
USD
Result
—
Estimated employees retained
Baseline departures—
Projected departures—
Estimated replacement cost impact—

1. Set the workforce size
Enter the average number of employees included in the overtime planning scenario.

2. Enter the current turnover rate
Use a comparable annualized turnover rate for the workforce before the proposed overtime change.

3. Enter the projected turnover rate
Use the scenario rate expected after the change in overtime planning.

4. Add replacement cost
Enter the estimated hiring, onboarding, and vacancy cost per departure if you want a monetary impact.

5. Interpret the sign
A positive retained-headcount result means fewer projected departures; a negative result means more projected departures.

Baseline departures = Employees × Baseline turnover rate
Projected departures = Employees × Projected turnover rate
Retention impact = Baseline departures − Projected departures
Replacement cost impact = Retention impact × Replacement cost per departure

Turnover rates are entered as percentages and converted to decimals in the calculation. All rates should represent the same annual period and employee population.

What the result means

A positive result is the estimated number of departures avoided under the projected turnover scenario.

This is a planning scenario and does not establish that overtime practices alone cause the turnover-rate change.

Given:
Employees = 300
Baseline turnover = 20%
Projected turnover = 16%
Replacement cost = $10,000 per departure

Calculation:
Baseline departures = 300 × 0.20 = 60
Projected departures = 300 × 0.16 = 48
Retention impact = 60 − 48 = 12 employees
Cost impact = 12 × $10,000 = $120,000

Result: The scenario implies 12 fewer departures and about $120,000 in avoided replacement cost.

Can this calculator prove that overtime changes improve retention?

No. It converts an assumed turnover-rate change into headcount and cost effects. Establishing causation requires stronger evidence and consideration of other workforce factors.

Which turnover rate should I use?

Use a rate calculated for the same employee group and annual period as the scenario. Avoid mixing voluntary turnover for one group with total turnover for another.

What if projected turnover is higher than baseline turnover?

The result becomes negative, indicating additional expected departures rather than retained employees. The cost impact will also be negative in this avoided-cost framing.

What should replacement cost include?

Use the cost definition your organization applies consistently, such as recruiting, onboarding, vacancy coverage, and training. If you do not want a monetary estimate, enter zero.

Why compare rates instead of overtime hours directly?

Overtime hours do not translate into a universal retention effect. This estimator keeps the uncertain relationship explicit by requiring you to enter the turnover scenario you want to test.