Man-Hours Calculator
Calculate the total man-hours required for your project by entering the number of workers and their working hours.
(100% = normal efficiency, lower for reduced productivity)
Project Man-Hours
(Accounting for efficiency factor)
(Based on 8-hour work days)
(Based on 5-day work weeks)
Workload Visualization
Man-Hours Optimization Tips
Improve Efficiency
Provide proper tools and training to increase worker efficiency and reduce the need for overtime.
Balance Workload
Distribute work evenly among team members to prevent burnout and maintain productivity.
Consider Overtime
Account for reduced efficiency when scheduling overtime (typically 10-30% less productive).
Plan for Contingencies
Add a 10-20% buffer to your estimates for unexpected delays or challenges.
How Man-Hours Are Calculated
The basic formula for calculating man-hours is:
Man-Hours = Number of Workers × Number of Days × Hours per Day
The efficiency-adjusted formula accounts for productivity:
Adjusted Man-Hours = (Man-Hours × 100) / Efficiency Factor