Formula

[DrJumaKhudonazarov]

I need to put a formula on survey 123 to calculate BMI (Body Mass Index). Can someone help me please with how to do that?

[Katie_Clark · Accepted solution]

Well, the formula for BMI is BMI = kg/m2 so you'll need a question for weight (in kg) and height (in meters). Then you just reference those fields in the calculation column of the XLS form (if you're using Survey123 Connect). Are you using connect, or the web form?

The calculation would look something like this:

${weight} div (${height} * ${height})

[DrJumaKhudonazarov]

Hi Katherine. thanks. Very helpful advice. I am using connect. I will try  to use  the formula 

[DrJumaKhudonazarov]

Hello  I think I am  doing something wrong  I used the formula and didn't  get the calculation . Can you please help?

[Katie_Clark]

It looks like you entered the calculation under the "Hint" column in the XLS form. You need to have a separate field (row in the XLS form) that will return the value of the calculation (the BMI). For this row, you enter the calculation expression in the "Calculation" column of the XLS form. 

[DrJumaKhudonazarov · Accepted solution]

Thank you very much it worked! Really appreciate 

[DrJumaKhudonazarov]

Dear Katherine, that's for your help last time    I have another problem for some reason in one of the multiply questions the survey automatically pick up all questions through I want only 1. Thanks in advance

[Katie_Clark]

I'm happy to help, but can you provide a bit more detail? Maybe some screenshots of the XLS form or something? 

[DrJumaKhudonazarov]

Dear Katherine  if you have time can you please advise. I have  3 variables  <80cm low risk for CVD:  81-102cm medium risk for CVD and > 103 high risk for CVD.  I want to have risk matrix graph where  I want to see only risk , low, medium  and high . is there any formula  or colour similiar  to  traffic light I can use

[Katie_Clark]

I'd love to help, but I'm really not quite sure what you're asking...

Are you asking about how to format the color of the text? Or something else?