Estimate total project work hours from number of workers × hours per day × number of days. Includes a two-way solver, a staffing-plan comparator, and labor cost estimation.
Example: 5 workers × 8 hours/day × 20 days = 800 man-hours; at a rate of Rp50,000/hour → Rp40,000,000 in labor costs.
Note: this tool calculates work-hour volume, not a guarantee of productivity or project outcomes. Man-hours do not capture differences in skill, team coordination, or downtime.
Compare a big-fast team scenario vs a small-slow one: total man-hours, duration, and the difference.
A man-hour is a unit of work volume: 1 man-hour = 1 person working for 1 hour. A project's total man-hours = number of workers × working hours per day × number of days. Example: 5 workers × 8 hours/day × 20 days = 800 man-hours.
Man-hours measure total work-hour volume, while FTE (full-time equivalent) measures workload in units of full-time employees. The common benchmark is 1 FTE = 2,080 hours/year (40 hours/week × 52 weeks). So 800 man-hours ≈ 0.38 FTE.
Count only productive working hours. Breaks, meals, and travel time are excluded. Overtime still counts as man-hours, but it is best recorded separately because its rates and fatigue effects differ.
The formula is the same; the context differs. Construction: 20 workers × 8 hours × 30 days = 4,800 man-hours for duration and labor-needs estimates. Software: 4 developers × 6 effective hours × 25 days = 600 man-hours for a sprint. Equal numbers do not imply equal productivity — the type of work and skill level strongly affect outcomes.
Divide the target by one worker's capacity. Example: a target of 800 man-hours, with each worker capable of 8 hours/day × 20 days = 160 hours. 800 / 160 = 5 workers. Fractional results are always rounded up because workers cannot be split. Use the Solver tab in this calculator.
Man-hours measure only hour volume, not productivity. They do not capture differences in skill between workers, learning curves, large-team coordination time, downtime, or rework. Two teams with identical man-hours can produce very different output. Use them as a planning tool, not a guarantee of results.
Yes: total man-hours × rate per hour = estimated labor cost. Example: 800 man-hours × Rp50,000/hour = Rp40,000,000. This covers only direct labor costs — it excludes materials, equipment, overhead, and margin. To determine an hourly rate, see the bill rate calculator.
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