Man-hours calculator
Total worked or planned person-hours for a group with the same schedule.
Enter your values
Check this tool fits your task
Use actual hours for reporting. This schedule-based total is an estimate unless reconciled with attendance and time records.
Your result
Enter your values, or try the example to see how it works.
Calculation breakdown
What to do next
Method and sources
Total = workers × days × (scheduled hours − non-working hours) + additional group hours.
How to use this tool
- Check the scope and collect measured or verified input values.
- Enter values using the displayed units, then calculate.
- Read the result, calculation breakdown and next steps together.
Worked example
10 workers × 5 days × 7.5 worked hours + 25 additional hours = 400 person-hours.
The example button fills illustrative values. Where a scope confirmation is shown, check it yourself before calculating.
Method and references
Total = workers × days × (scheduled hours − non-working hours) + additional group hours.
Use actual hours for reporting. This schedule-based total is an estimate unless reconciled with attendance and time records.
Common questions
Are man-hours and person-hours the same?
Yes. One person working one hour contributes one person-hour.
What about different shifts?
Calculate each group separately and add their totals. Do not use a single schedule for people who worked different hours.
Can I use the result in TRIR or DART?
Use reconciled actual hours for the same workforce and reporting period as the cases, following the applicable reporting method.
Public beta · Check the method and inputs with a competent reviewer before operational use.
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