Man-Hours Calculator
Results are estimates based on the values you enter. Recheck your inputs and assumptions before using the output for decisions.
Calculate total man-hours from team size, hours per day, and project days.
Man-Hours Calculator
Free online man-hours calculator to estimate the total number of labor hours required for a project from team size, hours worked per day, and project length in days. This calculator is useful for contractors, site supervisors, operations teams, maintenance planners, manufacturers, project managers, and students who want a quick way to measure labor effort. It helps convert a simple work schedule into a clearer labor total that can be used for scheduling, budgeting, staffing, and progress tracking.
This page uses three main inputs: number of people, hours per day, and project days. Number of people means the size of the team assigned to the job. Hours per day means the average hours worked by each person each day. Project days means the number of working days planned for the task. From those values, the calculator shows total man-hours, team hours per day, total man-days, and equivalent 8-hour days. These outputs make it easier to compare labor effort across projects and reporting formats.
The formula of man-hours
Total man-hours = Number of people x Hours per day x Project days
Team hours per day = Number of people x Hours per day
Total man-days = Number of people x Project days
Equivalent 8-hour days = Total man-hours / 8
Here number of people means the total workers assigned, hours per day means the daily working time per person, and project days means the number of working days in the period. Total man-hours shows the full labor time committed to the job.
Solved Example
Example 1: Find the man-hours if 6 people work 8 hours per day for 15 days.
Solve: Team hours per day = 6 x 8 = 48 hours
Total man-hours = 6 x 8 x 15 = 720 hours
Total man-days = 6 x 15 = 90
Equivalent 8-hour days = 720 / 8 = 90
Example 2: Find the result if 10 people work 9 hours per day for 12 days.
Solve: Team hours per day = 10 x 9 = 90 hours
Total man-hours = 10 x 9 x 12 = 1,080 hours
Total man-days = 10 x 12 = 120
Equivalent 8-hour days = 1080 / 8 = 135
Example 3: Find the result if 4 people work 7.5 hours per day for 20 days.
Solve: Team hours per day = 4 x 7.5 = 30 hours
Total man-hours = 4 x 7.5 x 20 = 600 hours
Total man-days = 4 x 20 = 80
Equivalent 8-hour days = 600 / 8 = 75
Table of man-hours calculator
| People | Hours / Day | Project Days | Total Man-Hours | Total Man-Days |
|---|---|---|---|---|
| 4 | 7.5 | 20 | 600 | 80 |
| 6 | 8 | 15 | 720 | 90 |
| 8 | 10 | 10 | 800 | 80 |
| 10 | 9 | 12 | 1,080 | 120 |
How to use this man-hours calculator
Enter the number of people in the proper input field. After that, enter the hours worked per day and the total project days. Make sure the days entered represent working days for the team, not calendar days unless that is how the project is actually scheduled. Then click the calculate button. The calculator will show total man-hours, team hours per day, total man-days, and equivalent 8-hour days in the result box.
This calculator is useful when planning staffing levels, checking whether deadlines are realistic, estimating labor input for quotes, and comparing different work schedules. If total man-hours are too high for the available deadline, the team may need more workers, longer shifts, or more project days. Looking at team hours per day alongside total man-hours also helps show whether the daily workload is balanced or too aggressive.
When using the result, remember that real project effort can vary because of breaks, overtime, downtime, travel, training, weather, and productivity differences between workers. Even so, man-hours remain one of the clearest basic measures of labor effort. This calculator gives a fast numerical view that supports scheduling, budgeting, capacity planning, and project reporting.