Man-Hours Calculator
Determines total person-hours required for a project and corresponding labor cost
Total workers on the project
Hours each worker puts in per day
Duration of the project in working days
Cost per hour of labor
Total labor hours for the project
Total cost of labor for the project
Cost for each hour of labor
Frequently Asked Questions
What are man-hours?
Man-hours (also called person-hours) measure the amount of work done by one person in one hour. If a project requires 200 man-hours, it could be completed by 1 person in 200 hours, 10 people in 20 hours, or 25 people in 8 hours. It is a standard unit for estimating labor costs and project timelines.
How do I estimate man-hours for a project?
Break the project into tasks, estimate hours per task, and add a buffer (typically 10-20%) for unforeseen issues. Track actual hours on completed projects to improve future estimates. Historical data is the most reliable basis for man-hour estimates.
What is the difference between man-hours and billable hours?
Man-hours count all hours worked on a project including overhead, administration, and rework. Billable hours are only the hours you can charge to a client. Utilization rate (billable / total hours) is typically 60-80% for professional services firms.
Related Calculators
Compound Interest Calculator
Calculates growth of money over time with compounding at any frequency
Inflation Calculator
Determines purchasing power changes over time using historical CPI data
FTE Calculator
Converts part-time employee hours into full-time equivalent headcount for workforce planning
Attrition Rate Calculator
Calculates employee turnover rate over a specified period