Calculator, Money, calculation, manMan-hours, also called person-hours, are the unit of measure that is used in project management to measure the efforts needed to complete a task.

1 man hour = work completed in an hour of uninterrupted effort by an average worker.

Calculating man hours is the basis for being able to measure the cost per project of each type of expert and his contribution to the result.

Start calculating the costs of all your resources by professional categories with ITM Platform


The total man hours per task is obtained by multiplying the number of people assigned to a task by the total time it takes to complete it.

Let's say, for example, that 15 workers at a metal plant and devote 10 workdays to complete an order of 800 product units.

Estimating 6 working hours per day, the total man hours is obtained from multiplying the following:

15 x 10 x 6 = 900 hours

Therefore, productivity is equal to 800/900 = 0.89 units per hour. As we know with the cost of man-hours, it is easy to calculate how the labor force contributes to the unit cost and the profitability of the product line.

In addition, this ratio can be taken as a starting point for measuring productivity improvements, introducing new processes and cutting costs.

However, in a more complex project it would also be necessary to consider that the cost of man-hours is variable, depending on the professional category to which it corresponds.

Not all team members cost the same

A requirement to be able to calculate the total labor cost of the project is to consider different hourly rates for each professional category. In an IT project, for example, it will not cost the same for one hour of a junior programmer as a senior one.

Therefore, when calculating the cost of the project from man hours, you must take into account that the multiplication of the cost must be factorized by each category:

Total cost = (CH1 x HH1) + … + (CHn x HHn)

Where CH1 is equal to the hourly cost of the professional category 1 and HH1 is the total of man hours estimated by the professional category 1.

Cost per project calculation with ITM Platform

ITM Platform allows you to calculate the costs of tasks and projects with man hours. For this you only have to define the values ​​of 3 variables:

  • The professional profiles of your organization

  • The fees associated with each professional profile

  • Standard costs, which will be calculated when a generic worker is assigned.

ITM Platform Standard costs: Global and Specific for Professional Categories

See in this tutorial how to define professional profiles, rates and standard costs in order to calculate the cost of all your tasks and projects.

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The management and planning of resources is an essential process in business, since it allows the monitoring of projects and their results, as well as anticipating the emergence of risks. a hipster caucasian businessman with beard standing angry pointing his wristwatch inside his office. angry concept . a contemporary style with pastel palette soft blue tinted background. vector flat design illustration. square layout.

The best way to handle the management of resources is to use some kind of assistant that helps to know, plan and manage the economic and human resources that are available, with the goal of achieving maximum efficiency. For this reason, many companies consider resource management as a priority.

Here are some practices that resource management can bring to your company.

Understand the difference between occupied time and utilized time  

If you realize that the employees are working all the time but are not reaching the goals set, there is something that is not working well: there is a mismatch between the time spent and the use of time efficiently. They may not be using the right procedures; they do not have the necessary technology or they need to update their training.

Are you ready to own your time? Start tracking your estimates live with ITM Platform for free.

Of course, it is also possible that project managers are not taking into account precautionary measures when estimating. Here are the 3 keys to estimating realistic times for your projects:

  1. Two out of ten working hours are not productive

In most countries, you have 8 working hours. However, keep in mind that if you have resources in France, for example, then there are 7 working hours.

However many hours there are in a working day, not all of those hours are productive. Employees will have to participate in meetings, interact with clients or engage in unplanned tasks.

Therefore, it is advisable to calculate that around 80% of actual hours worked will be productive. This is not a guarantee, on the contrary: although the efficiency of your equipment will exceed this threshold, a lot can happen that may reduce the amount of hours dedicated to a project.

  1. Find out how many resources are assigned to each project

Although it would be most efficient to have your analysts dedicated exclusively to a project from start to finish, there are plenty of reasons why this is neither usual nor practical: from small projects where only specific participation of certain experts is required or highly specialized tasks concentrated in certain phases of the project, to very complex projects that displace some resources from their usual projects.

It is logical that effectiveness decreases as the number of projects to which a resource is allocated increases.


For example, if you only assign one hour a day for a critical task, it is very possible that your project will be delayed: the employee assigned to the task is likely to perceive that there are more important things to do, unless you properly communicate that this task is your top priority.

  1. Calculate how much time will be spent on learning

Estimates are usually based on the time spent on a similar project. But, as it is said, the devil’s in the detail.

It is possible that some of the differences in the new project will hide challenges that team members will have to learn before overcoming, either in a planned or on-the-job process. Detecting these critical points will allow us to better identify if there are more suitable team members for the project than others or if it is worth outsourcing some parts of the process.

Support estimations with applications

Adequate project management begins by identifying these problems before undertaking new projects. Whether it be short-term or business operations, which can become problems to estimate and correctly allocate the times.

That is why it is so important to use applications that monitor the exact state of all projects of the company in real time.

For example, with ITM Platform Teambot, you can make it easier for your team members to:

  • Consult active projects, reducing the transit from one project to another
  • Report time spent on a task in real time, improving your future estimates
  • Send feedback from a contrasting chat environment, such as Slack

Once the results of the analysis are known, the reasons for deviations can be detected and decisions can be taken to make production processes more efficient.

If you want to discover how to better control the time management of your team with ITM Platform, we invite you to request a personalized demo, where you can speak to one of our experts.


Juan Delgado
ITM Platform

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