Calculate scheduled and productive man-hours from crew size, shift hours, utilization, and project length, then review person-days, FTE-week equivalents.
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Translate crew size and shift design into total project hours Combine workers, shift hours, shifts per day, project length, and productive-time utilization to see both scheduled man-hours and the effective hours likely to turn into output.
Assumptions
Scheduled man-hours are crew hours on the roster, while productive man-hours apply the utilization percentage to account for setup, handoffs, travel, meetings, or other non-productive time inside the same shift pattern.
Result
720 scheduled man-hours
A crew of 6 working 8 hours across 1 shifts per day for 15 days creates 612 productive man-hours at 85% utilization.
Productive man-hours
612
Daily crew hours
48
Utilization loss hours
108
Person-days
90
FTE weeks
18
Hours per worker across project
102
Current crew capacity is below the target The current crew and schedule fall short of the target productive man-hours, so the plan likely needs more people, more shifts, longer shifts, or more project days.
A man-hours calculator converts a crew plan into labor time. Instead of thinking only in people, it turns workers, shift hours, shifts per day, project length, and productive-time utilization into scheduled and productive man-hours that are easier to compare across projects or staffing options.
What man-hours are measuring
Man-hours express labor input as time, not just headcount. A six-person crew on an eight-hour shift for fifteen days is not only six workers on site. It is 720 scheduled labor hours before any utilization allowance is applied.
That time-based view matters because project estimates, staffing plans, and productivity comparisons are usually easier to manage in hours than in people alone. Hours create one common unit for comparing different crew sizes and shift patterns.
The formula and the productive-hours view
This calculator multiplies workers by hours per shift, shifts per day, and project days to calculate scheduled man-hours. It then applies a productive-utilization percentage to estimate the hours likely to convert into useful output after allowing for setup, travel, handoffs, meetings, or other non-productive time inside the same schedule.
The target support then works backward from productive hours. If you enter a productive man-hour target, the calculator shows the gap to target, the project days needed on the current crew basis, and how many extra project days would be required if nothing else changes.
Scheduled man-hours = Workers x Hours per shift x Shifts per day x Project days
The total labor hours placed on the schedule before utilization is applied.
Productive man-hours = Scheduled man-hours x Utilization rate
The labor hours expected to convert into productive output on the basis entered.
Worked example: a six-person crew over fifteen days
Suppose a project uses 6 workers, one 8-hour shift per day, and a 15-day schedule. Scheduled man-hours are 720. If you assume 85 percent productive utilization, productive man-hours fall to 612 and utilization loss hours total 108.
If the target is 700 productive man-hours, the current plan is short by 88 hours. On the same crew and shift basis, the project would need roughly 17.16 days in total, or about 2.16 additional project days, to meet the target.
Why crew hours still need context
A man-hour total does not measure quality, sequencing, supervision burden, or rework by itself. Two projects can consume the same labor hours and still produce very different results depending on site conditions, skill mix, material flow, and complexity.
Utilization assumptions are especially important. A schedule can look adequately staffed on paper but still deliver less useful output than expected if a meaningful share of crew time is lost to coordination or downtime.
What is the difference between scheduled and productive man-hours?
Scheduled man-hours are the raw hours on the crew plan. Productive man-hours apply the utilization percentage to reflect the share of that time expected to convert into useful output.
Why does this calculator use shifts per day as a separate input?
Because a multi-shift operation can create more total crew hours without changing the number of workers assigned to each shift.
What do project days needed at target mean?
It is the total project duration required to reach the target productive man-hours if the current crew size, shifts, and utilization assumptions stay the same.
Can I use this for any industry?
Yes, as a general labor-planning tool. The important part is that your shift and utilization assumptions reflect the actual operating conditions of the job.
