Total the man-hours a job needs from people, hours and days.
Please do not make financial decisions based on these results.
What is the Man-Hours Calculator?
Total the man-hours a job needs from people, hours and days. To use the Man-Hours Calculator, enter number of workers, hours per day each, days, cost per man-hour; it returns total man-hours, labor cost, man-days, days if one more worker is added, and shows them instantly as you type.
Where the Man-Hours Calculator fits
Total the man-hours a job needs from people, hours and days. The main figure it returns is the Total man-hours, worked out from the values you enter.
It belongs with the other business planning tools. If you are comparing options or checking a result from another angle, try the Average Fixed Cost Calculator, Build vs. Buy Calculator or the Cost of Doing Business Calculator.
How to use the Man-Hours Calculator
- Enter your numbers. Start with Number of workers, Hours per day each, Days, then fill in Cost per man-hour ($). Use figures from the same period (same month, quarter or year) for every field. Fields marked optional can stay at zero.
- Read the result. The highlighted box gives the Total man-hours, and the cards below show Labor cost, Man-days, Days if one more worker is added. Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the Man-Hours Calculator using the default values shown in the calculator above:
Inputs
| Number of workers | 6 |
|---|---|
| Hours per day each | 8 |
| Days | 12 |
| Cost per man-hour ($) | 28 |
Results
| Total man-hours | 576 |
|---|---|
| Labor cost | $16,128.00 |
| Man-days | 72 |
| Days if one more worker is added | 10.3 |
With these inputs the calculator returns Total man-hours: 576. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Number of workers from 6 to 7.2 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| Total man-hours | 576 | 691 | +20% |
| Labor cost | $16,128.00 | $19,353.60 | +20% |
| Man-days | 72 | 86 | +20% |
| Days if one more worker is added | 10.3 | 10.5 | +2.4% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The results panel of the Man-Hours Calculator reports Total man-hours, labor cost, man-days and days if one more worker is added. Compare these figures while changing one input at a time, and use the related calculators below to look at the same situation from another angle.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. The result is only as accurate as the numbers you enter and the formula shown above. It is for information, not financial, tax or legal advice.
Frequently asked questions
How do man-hours help planning?
They convert a task into total labor effort so you can set staffing and deadlines.
Can these calculators replace an accountant?
No. They give fast estimates from your inputs. Use an accountant for tax, audited accounts and valuation reports.
Can I use these for a business plan?
Yes. They give quick estimates for break-even, valuation, budgets and project returns. Confirm important figures with your accountant before relying on them.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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