**happybagnet**Hi, I'm trying to do the ff:

I wanted to add the beginning, and delivery and minus it to used and rejects and put the calculation on ending box. I have tried the calculations but Im having a hard time doing it. Tried looking at the manuals but I cannot get it right.

- JotForm Support
**Chriistian**I checked your form (http://www.jotform.me/form/70958880812467) and it seems that the calculation is working on your form. Here's how it appears on my end.

However, I noticed that you made the right calculation for the first row only. You can also do the same with the rest of the rows in the Matrix Field.

Let us know if you need further assistance.

Regards.