To calculate the time spent on tasks/projects and the cost of these tasks/projects according to the time spent, as it is shown on the screenshot above, please, do the following steps:
- Create task group 'Projects'
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image002.jpg)
- Create task groups 'Project 1', 'Project 2' within task group 'Projects'
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image004.jpg)
- Create tasks within task groups 'Project 1', 'Project 2'
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image006.jpg)
- Go to menu Tools and select Custom Fields
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image008.jpg)
- Click on 'New' button in 'Edit custom fields' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image010.jpg)
- Enter 'Time Spent' into Title field in 'Edit Custom Field' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image012.jpg)
- Select 'Duration' in Type Field in 'Edit Custom Field' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image014.jpg)
- Uncheck 'Required' option in 'Edit Custom Field' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image016.jpg)
- Enter the below formula into 'Formula:' field in 'Edit Custom Field' window and click 'OK' button
$finish - $start
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image018.jpg)
- Click on 'New' button in 'Edit custom fields' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image020.jpg)
- Enter 'Cost' into Title field in 'Edit Custom Field' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image022.jpg)
- Select 'Currency' in Type Field in 'Edit Custom Field' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image024.jpg)
- Uncheck 'Required' option in 'Edit Custom Field' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image026.jpg)
- Enter the below formula into 'Formula:' field in 'Edit Custom Field' window and click ‘OK' button
($cf_time_spent*24)*10.00
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image028.jpg)
- Click 'OK' button in 'Edit custom fields' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image030.jpg)
- Go to View menu, select option Columns, select option Task Tree Columns and activate option Time Spent and Cost
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image032.jpg)
- Go to Task Tree tab
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image034.jpg)
- Right click on a task group 'Projects' and select option 'Custom fields options'
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image036.jpg)
- Select 'Time Spent' field in 'Edit custom field options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image038.jpg)
- Select 'Subgroups&Tasks' option in 'Settings For:' field in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image040.jpg)
- Select 'Enable' option in 'Field: Time Spent' in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image042.jpg)
- Select 'Aggregated (for taskgroup)' in checked 'View in preview sections' option
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image044.jpg)
- Select 'Sum' and 'Time Spent' in drop down lists in option 'Aggregated (for taskgroup)'
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image046.jpg)
- Select 'This task group' option in 'Settings For:' field in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image048.jpg)
- Select 'Enable' option in 'Field: Time Spent' in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image050.jpg)
- Select 'Aggregated (for taskgroup)' under checked 'View in preview section' option and click 'OK' button in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image052.jpg)
- Select 'Sum' and 'Time Spent' in drop down lists in option 'Aggregated (for taskgroup)'
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image054.jpg)
- Select 'Cost' field in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image056.jpg)
- Select 'Subgroups&Tasks' option in 'Settings For:' field in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image058.jpg)
- Select 'Enable' option in 'Field: Cost' in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image060.jpg)
- Select 'Aggregated (for taskgroup)' under checked 'View in preview section' option
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image062.jpg)
- Select 'Sum' and 'Cost' in drop down lists in option 'Aggregated (for taskgroup)'
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image064.jpg)
- Select 'This task group' option in 'Settings For:' field in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image066.jpg)
- Select 'Enable' option in 'Field: Cost' in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image068.jpg)
- Select 'Aggregated (for taskgroup)' in checked 'View in preview section' option in 'Edit custom filed options for 'Projects' window
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image070.jpg)
- Select 'Sum' and 'Cost' in drop down lists in option 'Aggregated (for taskgroup)'
![](/images/tutorial/faq/how-to-calculate-time-on-projects_clip_image072.jpg)
- Click 'OK' button in 'Edit custom filed options for 'Projects' window