Last updated: 2026-06-07
Quick Answer
To calculate man-hours: Man-Hours = Workers × Hours per Day × Days. One man-hour is one person working for one hour. A crew of 4 working 8-hour days for 5 days logs 160 man-hours. This calculator returns total man-hours, hours per worker, crew-days, and an estimated labor cost when you add a burdened rate. Built for contractors sizing crew labor on a bid, not just timekeeping.
Inputs you'll need
- Number of workers (crew size)
- Hours per day per worker (usually 8)
- Number of days the crew works the job
- Burdened hourly rate (optional, to estimate labor cost)
Related tools: Labor Cost Calculator, Burdened Labor Rate Calculator, and Overtime Calculator.
How to use this man-hours calculator
- Enter the crew size (number of workers on the job).
- Set hours per day, usually 8 for a standard shift.
- Enter the number of days, using a fraction like 2.5 for a partial last day.
- Add a burdened hourly rate if you want an estimated labor cost.
Sizing labor for a full bid? Roll the hours into our Labor Cost Calculator.
How many people are on the crew
Worked hours per person per day (default 8)
How many days the crew works the job
Burdened hourly rate to estimate labor cost
Labor Breakdown
Man-Hours Guide for Contractors
How to estimate crew labor with man-hours and production rates, and how to turn those hours into a schedule and a price.
How to Calculate Man-Hours
Man-hours equal the number of workers times the hours each works per day times the number of days. One man-hour is one person working for one hour, so a crew of 4 working 8 hours for 5 days logs 4 x 8 x 5 = 160 man-hours.
The number matters because labor is usually the biggest line on a bid. Material you can count off a plan. Labor you have to estimate from how long the work actually takes, and man-hours is the unit that lets you do it.
- Total man-hours: workers x hours per day x days.
- Hours per worker: hours per day x days, what each person puts in.
- Crew-days: workers x days, a quick planning unit for scheduling.
Multiply total man-hours by a burdened hourly rate and you have a labor cost you can drop straight into the estimate.
Key Takeaways
- One man-hour is one worker for one hour of work
- Total man-hours = workers x hours per day x number of days
- Multiply man-hours by a burdened rate to get labor cost for the bid
Using Production Rates to Estimate Man-Hours
The honest way to estimate man-hours on real work is a production rate: how much one worker finishes in an hour. If a hanger sets drywall at about 35 square feet an hour, a 2,000 square foot job is roughly 2,000 / 35 = 57 man-hours of hanging.
I keep production rates in my head for the work I do over and over, because that is where a tight bid comes from. A few rough field numbers I lean on:
- Hanging drywall: 30 to 40 sq ft per man-hour.
- Interior painting (roll and cut): 150 to 200 sq ft per man-hour per coat.
- Framing interior walls: 8 to 12 linear feet per man-hour.
- Setting floor tile: 15 to 25 sq ft per man-hour.
These are ranges, not gospel. Old houses, tight access, and high ceilings push them the wrong way, which is exactly why you build in contingency.
Key Takeaways
- A production rate is units of work one person completes per hour
- Man-hours = quantity of work / production rate
- Production rates vary with access, ceiling height, and the age of the house
Man-Hours, Schedule, and the Mistake of Adding Bodies
Man-hours tell you the total work, but they do not tell you how fast you can finish it. A 160 man-hour job is not done in one day just because you throw 20 people at it. Some work has to happen in order, and a crowded jobsite gets slower, not faster.
To turn man-hours into a schedule, divide by crew size and daily hours: 160 man-hours with a crew of 4 at 8 hours a day is 160 / (4 x 8) = 5 working days. That is the planning number, before weather, inspections, and material delays.
Two things burn contractors here:
- Forgetting the premium when you compress the schedule. Finishing faster usually means overtime, and that extra cost belongs in the bid.
- Assuming more workers scale perfectly. Past a point, an extra body on a small job just gets in the way.
Good, fast, or cheap. Pick two. Man-hours are how you price the fast.
Key Takeaways
- Total man-hours measures work, not calendar time
- Days to complete = man-hours / (crew size x hours per day)
- Compressing a schedule usually adds overtime cost that belongs in the bid
Worked man-hour scenarios
Common crew setups so you can sanity-check the math. Labor cost assumes a $42 burdened rate where shown.
| Scenario | Inputs | Total man-hours |
|---|---|---|
| Solo punch-out day | 1 worker, 8 hrs, 1 day | 8 hrs ($336 labor) |
| Two-man bathroom remodel | 2 workers, 8 hrs, 10 days | 160 hrs ($6,720 labor) |
| Standard crew week | 4 workers, 8 hrs, 5 days | 160 hrs ($6,720 labor) |
| Big framing push | 6 workers, 10 hrs, 12 days | 720 hrs ($30,240 labor) |
Rule-of-thumb production rates
Rough field numbers for converting a quantity of work into man-hours. Ranges, not gospel. Tight access and old houses push them the wrong way.
| Task | Production rate (per man-hour) | 200-unit job |
|---|---|---|
| Hanging drywall | 30–40 sq ft | ~5–7 man-hours |
| Interior painting (per coat) | 150–200 sq ft | ~1–1.3 man-hours |
| Framing interior walls | 8–12 linear ft | ~17–25 man-hours |
| Setting floor tile | 15–25 sq ft | ~8–13 man-hours |
How to Use This Calculator
Enter Your Crew Size
Put in the number of workers on the job. One man-hour is one person working for one hour, so crew size is the first multiplier.
Enter Hours per Day
Add the worked hours per person per day. The default is 8 for a standard shift. Drop it lower for a half day or raise it when the crew runs long.
Enter the Number of Days
Put in how many days the crew works the job. Use a fraction like 2.5 if the work wraps up midday on the last day.
Add a Labor Rate to Get Cost
Enter a burdened hourly rate and the calculator multiplies it by total man-hours to estimate labor cost for the bid. Leave it blank if you only need the hours.
Man-Hours Formulas
Total Man-Hours = Workers x Hours per Day x Days
Hours per Worker = Hours per Day x Days
Crew-Days = Workers x Days
Estimated Labor Cost = Total Man-Hours x Burdened Rate
Days to Complete = Total Man-Hours / (Workers x Hours per Day)Where:
- Workers
- = Crew size, the number of people on the job
- Hours per Day
- = Worked hours per person per day (8 is a standard shift)
- Days
- = How many days the crew works the job
- Burdened Rate
- = True cost per labor hour after payroll taxes, workers comp, and benefits
- Crew-Days
- = One worker for one day, a quick unit for scheduling
Frequently Asked Questions
How do I calculate man-hours?
Multiply the number of workers by the hours each works per day by the number of days. Man-Hours = Workers x Hours per Day x Days.
Example: a crew of 4 working 8 hours a day for 5 days is 4 x 8 x 5 = 160 man-hours. One man-hour is one person working for one hour.
What is a man-hour?
A man-hour is one worker doing one hour of work. It is the unit estimators use to size labor on a job. Ten workers for one hour and one worker for ten hours are both 10 man-hours of effort, even though the calendar time is wildly different.
How do contractors estimate man-hours for a job?
The reliable way is a production rate: how much one worker finishes in an hour. If a tile setter lays about 20 square feet per man-hour, a 200 square foot floor is roughly 200 / 20 = 10 man-hours of setting. Divide the quantity of work by the production rate to get man-hours, then price it. Use our labor cost calculator to roll those hours into a full job estimate.
How do I turn man-hours into a schedule?
Divide total man-hours by crew size times daily hours. Days = Man-Hours / (Workers x Hours per Day). A 160 man-hour job with a crew of 4 at 8 hours a day takes 160 / 32 = 5 working days, before weather, inspections, and material delays. Adding more workers does not always shrink the schedule, because some work has to happen in order.
How do I price labor from man-hours?
Multiply total man-hours by a burdened hourly rate, the true cost per hour after payroll taxes, workers comp, and benefits. 160 man-hours at a $42 burdened rate is 160 x $42 = $6,720 of labor cost. Use the burdened labor rate calculator to build that rate, then drop the labor total into your bid.
Does compressing the schedule change the man-hours?
The man-hours stay roughly the same, but the cost can go up. Finishing a 160 man-hour job in three days instead of five usually means overtime, and the overtime premium is real labor cost that has to be in the bid. Run those hours through our overtime calculator so the premium does not come out of your margin.
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