**Railtrain**I want to create a timesheet. Can column 3 (total Hours Worked) be an auto calculation of the start and finish times.

i.e for Monday I had manually enter the total hours worked. I want this to be an auto calculation, not a manual inputted one.

- JotForm Support
**Welvin**Yes, this is possible in our conditional logic feature. However, there's a bug in the settings where you cannot select what input in the matrix to put the calculation. So, for now, you can use another field for the total. Here's our guide for the calculation in the matrix:

http://www.jotform.com/help/343-How-to-perform-form-calculation-using-the-Matrix-Field-