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Man-Hours Calculator

Calculate total man-hours from workers, hours per day, and days. Optional efficiency factor. Reverse: man-hours and workers to days/hours.

Use the Man-Hours Calculator

Enter workers, hours per day, and days (or use reverse: man-hours + workers to get days/hours). Optional efficiency %.

Work inputs

Workers, hours per day, days worked. Optional efficiency %. Reverse: enter man-hours and workers to get days/hours.

Results

Total man-hours
800

Man-hours = Workers × Hours per day × Days. Effective = Man-hours × Efficiency %. Reverse: divide total man-hours by workers to get hours, then by hours/day for days.

What this metric means

Man-hours measure total labour input. They're used for scheduling, quoting, and capacity planning. Effective man-hours adjust for productivity.

How to calculate it

Man-hours = Workers × Hours per day × Days. Effective = Man-hours × Efficiency % (e.g. 0.8 for 80%). Reverse: Hours needed = Man-hours ÷ Workers; Days = Hours ÷ Hours per day.

How to improve the metric

Improve efficiency (process, tools, training) so effective man-hours rise for the same clock time. Or add workers/days to increase total man-hours.

Common mistakes

Confusing man-hours with FTE; using different definitions of 'hours per day' (paid vs worked); or ignoring efficiency and overcommitting.

How to interpret your result

Use total man-hours for labour cost and capacity. Use effective man-hours when estimating how much work can be done in a period.

FAQs

What are man-hours?▾
Man-hours = Workers × Hours per day × Days worked. It's total labour time (person-hours) for the period.
What is effective man-hours?▾
Man-hours × Efficiency %. If only 80% of time is productive, effective man-hours = 0.8 × man-hours. Use for capacity or quoting.
How does reverse mode work?▾
Enter total man-hours needed and number of workers. The calculator gives total hours and days (using the same hours per day from the form).
Why use efficiency %?▾
Not all clock time is productive (breaks, admin, rework). Efficiency adjusts for that so you plan with realistic capacity.

Related tools

Browse all calculators on NetGrow.

NetGrow

Man-Hours Calculator

Calculate total man-hours from workers, hours per day, and days. Optional efficiency factor. Reverse: man-hours and workers to days/hours.

Use the Man-Hours Calculator

Enter workers, hours per day, and days (or use reverse: man-hours + workers to get days/hours). Optional efficiency %.

Work inputs

Workers, hours per day, days worked. Optional efficiency %. Reverse: enter man-hours and workers to get days/hours.

Results

Total man-hours
800

Man-hours = Workers × Hours per day × Days. Effective = Man-hours × Efficiency %. Reverse: divide total man-hours by workers to get hours, then by hours/day for days.

What this metric means

Man-hours measure total labour input. They're used for scheduling, quoting, and capacity planning. Effective man-hours adjust for productivity.

How to calculate it

Man-hours = Workers × Hours per day × Days. Effective = Man-hours × Efficiency % (e.g. 0.8 for 80%). Reverse: Hours needed = Man-hours ÷ Workers; Days = Hours ÷ Hours per day.

How to improve the metric

Improve efficiency (process, tools, training) so effective man-hours rise for the same clock time. Or add workers/days to increase total man-hours.

Common mistakes

Confusing man-hours with FTE; using different definitions of 'hours per day' (paid vs worked); or ignoring efficiency and overcommitting.

How to interpret your result

Use total man-hours for labour cost and capacity. Use effective man-hours when estimating how much work can be done in a period.

FAQs

What are man-hours?▾
Man-hours = Workers × Hours per day × Days worked. It's total labour time (person-hours) for the period.
What is effective man-hours?▾
Man-hours × Efficiency %. If only 80% of time is productive, effective man-hours = 0.8 × man-hours. Use for capacity or quoting.
How does reverse mode work?▾
Enter total man-hours needed and number of workers. The calculator gives total hours and days (using the same hours per day from the form).
Why use efficiency %?▾
Not all clock time is productive (breaks, admin, rework). Efficiency adjusts for that so you plan with realistic capacity.

Related tools

Browse all calculators on NetGrow.