Hello sir, I need help. Thanks to your instructions I managed to calculate the surface area of my space measured by “area” and I managed to have it displayed in a note. however I would like to create another question after the note which contains the value of my measured surface area in order to be able to multiply it or divide it by 10000. And how can I succeed in multiplying the value of the surface area obtained by another number. THANKS

Welcome to the community, @RIKI225! You should be able to do it as outlined in the image shared below:

#### In the survey tab of your XLSForm:

#### Data entry screen as seen in Enketo:

#### Reference XLSForm:

Area Calculation.xls (26 KB)

You should be able to learn more about the operator functions in this support article **Calculate Question Type**.

Thanks . But if i want multiplicate by 10000 how do i do?

Great! But web i use * i dont have result

@RIKI225, please check out our support article **Calculate Question Type** to learn more about the **operator functions in KoboToolbox**.

Thanks. it is ok now.

Is it possible To calculate perimeter of land via Kobocollect ? If yes what is the formula for calculate ? Thanks.