How can i add this formula ${qty}*${price} to display the calculation on the form when the qty & price have been entered?

[Kal_Lam]

@monigath, have you gone through this post discussed previously?

Fomula for finding BMI

@hhfoffice, you could do it by adding an if-statement as shown in the image below: In the survey tab of your XLSForm: [Image 1] Data entry screen as seen in Enketo: [Image 2] Reference XLSForm: Calculate BMI.xlsx (9.2 KB)

It should help you on how you perform operations function in KoboToolbox.