Calculating 24/7 Boiler Room Staffing with 832 Annual PTO Days

To maintain continuous (24/7) coverage in a boiler room when employees take 832 paid-time-off (PTO) days annually, staffing must account for both baseline coverage and PTO replacement.

Step-by-Step Calculation

1. Total annual hours to cover: 24 hrs/day × 365 days = 8,760 hours.
2. PTO hours: 832 days × 24 hrs/day = 19,968 hours of absence.
3. Net hours needing coverage: 8,760 + 19,968 = 28,728 hours (PTO hours are additional staffing needs, not a reduction).
4. Annual hours per FTE: 40 hrs/week × 52 weeks = 2,080 hours.
5. FTEs required: 28,728 ÷ 2,080 = 13.8 → 14 FTEs (round up).

Important Correction

The original calculation in the source incorrectly subtracted PTO hours from coverage hours. PTO hours are additional staffing needs, not a reduction. Each employee on PTO requires a replacement for their shift.

Practical Considerations

• Shift schedule (8-hr vs 12-hr shifts) affects FTE count and overtime.
• Overtime, float pools, and cross-training can reduce headcount.
• ISO 21500, labor laws, and collective bargaining agreements govern actual staffing plans.
• Fatigue management is critical in 24/7 safety-sensitive operations.

Consult a workforce planning specialist for your specific operation.