Man-Hours Calculator
Calculate total labor hours for any team, crew, or project. Enter your worker count, hours per day, and working days — and get total man-hours, worker-days, average hours per worker, and estimated total labor cost. Built for project managers, contractors, and operations teams.
Enter your labor inputs
Man-hours = workers × hours per day × working days. Add an hourly rate to get total labor cost. Use a preset to load a typical scenario quickly.
Efficiency factor
Real projects rarely run at 100% — breaks, setup, waiting, and rework reduce effective output. Construction typically runs 75–85%, office work 85–95%. Adjust to match your experience.
Best use cases
Project staffing plans, job cost estimates, contractor quotes, production scheduling, service operations, and workforce capacity planning.
What is a man-hour?
A man-hour (also written as person-hour or labor-hour) is the amount of work one person can complete in one hour. It is the standard unit for measuring total labor effort on a project or task, independent of how many workers are involved or how long the project takes in calendar time.
A project requiring 400 man-hours can be completed by 1 worker in 50 days, 5 workers in 10 days, or 10 workers in 5 days — the total effort is the same. Man-hours let you compare workloads, build cost estimates, and model staffing scenarios on equal terms.
Man-hours formula
Example: 5 workers × 8 hours/day × 10 days = 400 man-hours. At $25/hour that is a labor cost of $10,000.
How to use this man-hours calculator
- Enter the number of workers performing the task.
- Enter average productive hours per worker per day (typically 7–8 for an 8-hour shift).
- Enter the number of working days in the schedule — exclude weekends and holidays.
- Optionally enter an average hourly rate to get a total labor cost estimate.
- Set the efficiency factor if workers are not at full productivity (80% is typical for field work).
- Click Calculate Man-Hours to see all outputs.
Scenario comparison guide
Frequently asked questions
What is the difference between man-hours and calendar time?
Man-hours measure total labor effort — the sum of all workers' time. Calendar time is how long a project takes from start to finish. A 400-man-hour project with 10 workers takes 5 calendar days, but still represents 400 hours of total labor effort. Man-hours are used for cost estimation; calendar time for scheduling.
How many man-hours are in a standard work month?
A standard work month has approximately 160–176 man-hours per worker (20–22 working days × 8 hours). For payroll and billing purposes, 173.33 hours/month is a commonly used figure (2,080 hours per year ÷ 12 months).
What efficiency factor should I use?
Typical efficiency factors by industry: office/knowledge work 85–95%, manufacturing 80–90%, construction field work 70–85%, maintenance and repair 75–85%. For highly complex or first-time tasks, 65–75% is more realistic. Use your historical project data if available.
Should I use hours scheduled or hours actually worked?
For planning, use expected productive hours — typically 7–7.5 hours in an 8-hour shift after accounting for breaks. For cost tracking after a project, use actual hours clocked. Comparing planned vs actual man-hours is one of the most useful project performance metrics.
Can man-hours be used for non-physical work?
Yes — man-hours apply to any type of labor: software development (often tracked as story points but ultimately converted to hours), consulting, design, writing, and analysis. The formula is identical regardless of work type.
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Disclaimer
This man-hours calculator provides planning estimates only. Actual labor requirements vary based on skill levels, overtime regulations, rest break requirements, travel time, equipment availability, and project-specific factors. Always add a contingency buffer of 10–20% for real-world projects. Consult a project manager or labour specialist for formal contract pricing.