Enter overtime planning inputs
Example data table
Use this sample to understand how labor costs and output gains affect overtime value.
| Scenario | OT Hours | Unit Margin | Fatigue % | Total Cost | Net Gain | ROI |
|---|---|---|---|---|---|---|
| Conservative | 20 | $10 | 12% | $780 | $220 | 28.21% |
| Balanced | 40 | $14 | 8% | $1,749 | $1,342 | 76.73% |
| Aggressive | 60 | $16 | 15% | $2,980 | $1,910 | 64.09% |
Formula used
Overtime Hours = Overtime hours per day × Overtime days per month
Direct Labor Cost = Base hourly rate × Overtime multiplier × Overtime hours
Fatigue Adjusted Units = Gross units × (1 − Fatigue reduction rate)
Net Sellable Units = Fatigue adjusted units − Quality loss units
Gross Contribution = Net sellable units × Contribution margin per unit
Total Overtime Cost = Labor + Benefits + Admin + Quality cost + Absenteeism cost + Setup cost
ROI (%) = ((Gross contribution − Total overtime cost) ÷ Total overtime cost) × 100
This model treats overtime as an investment decision. It combines labor premiums with output gains, then reduces expected value using fatigue, quality loss, and attendance risk factors.
How to use this calculator
- Enter the worker’s base hourly rate and overtime multiplier.
- Add expected extra hours and working days for the period.
- Estimate additional units produced per overtime hour.
- Enter contribution margin for each sellable unit.
- Adjust for fatigue, quality losses, and overhead burden.
- Include absenteeism and setup costs for realistic planning.
- Submit the form and review net gain, ROI, payback, and breakeven units.
- Export the result table as CSV or PDF for reporting.
Frequently asked questions
1. What does overtime ROI measure?
It measures whether extra work hours generate enough added contribution to cover premium wages, overhead, fatigue losses, and other overtime-related costs.
2. Why include fatigue reduction?
Fatigue can lower hourly output and increase mistakes. Including it makes your forecast closer to real operating conditions, especially during sustained overtime periods.
3. What is contribution margin per unit?
Contribution margin is the amount each additional unit contributes after variable production costs. It is the value available to cover labor, overhead, and profit.
4. Should all departments use the same assumptions?
No. Different teams have different productivity, rework, supervision, and attendance patterns. Use department-specific assumptions for more reliable decisions.
5. What does breakeven units mean?
Breakeven units show how many sellable units must be produced to fully recover overtime costs. It helps managers compare targets against realistic capacity.
6. How should I interpret a negative ROI?
A negative ROI means projected contribution does not cover total overtime costs. You may need higher output, better margins, or lower risk assumptions.
7. Can this calculator support budget planning?
Yes. It helps compare staffing options, estimate cost pressure, and test whether overtime can support revenue goals without reducing profit quality.
8. Is this calculator suitable for service teams?
Yes. Replace units with billable tasks, tickets, or appointments. Then use contribution margin and quality loss assumptions that match service delivery.