I am looking to create a BMI calculator where the user gives us their weight in KGS and Height in Centimeter and the form would calculate their BMI and would suggest them if they fall in Underweght, Normal or Overweight category.
Is this type of calculation also possible?
Best answer by amy.carlson
Hi 
However, let me know if it does not work for you! Test it Here
The calculation I am using for the BMI is what I found on google, which is: Mass/Height^2
Question 1 - Number question: What is your height in cm? **needs to be a whole number
Statement 1: It looks like you entered @recall Q1, the value needs to be higher than 0.
Question 2 - Number question: What is your weight in kg? **needs to be a whole number
Statement 2: It looks like you entered @recall Q2, the value needs to be higher than 0
Statement 3: Your BMI is @weight
Endings:
Variables:
bmi= 0
height= 0
hundred=100
weight= 0
Okay and now the logic.
Advanced → Branching & Calculations
Question 1:
Statement 1:
Question 2:
Statement 2:
Statement 3:
Feel free to post questions here, or suggestions! I’m happy to discuss, this was really fun to troubleshoot, so thank you 
!
+5Hi
Our calculator will ask for a specific number entered when calculating the next equation after setting up the math.
For example, If weight is equal to 130, add, 50.
The calculator won’t be able to create a calculation like,
Add the weight to the height.
Though, I’ll share this post with our product team, as having advanced calculations like this would be very handy!
The workaround I can think of for this would be to specify every possible measurement in the calculator, though that may take some time to build.
If you think of anything else, please post it here! Others may also have a fancy workaround for this that I may not have thought of. :)
+2Hi
However, let me know if it does not work for you! Test it Here
The calculation I am using for the BMI is what I found on google, which is: Mass/Height^2
Question 1 - Number question: What is your height in cm? **needs to be a whole number
Statement 1: It looks like you entered @recall Q1, the value needs to be higher than 0.
Question 2 - Number question: What is your weight in kg? **needs to be a whole number
Statement 2: It looks like you entered @recall Q2, the value needs to be higher than 0
Statement 3: Your BMI is @weight
Endings:
Variables:
bmi= 0
height= 0
hundred=100
weight= 0
Okay and now the logic.
Advanced → Branching & Calculations
Question 1:
Statement 1:
Question 2:
Statement 2:
Statement 3:
Feel free to post questions here, or suggestions! I’m happy to discuss, this was really fun to troubleshoot, so thank you !
+5+5+6Literally the task I am trying to solve, a BMI calc. This is gold. Thank you @amy.carlson
+6If someone’s looking for my jaw, it’s on the floor. Excellent stuff, 
Can you tell me what plan you used to build it? Essential / Professional or Premium? I will upgrade to the correct version then :)
+2Hey 
) but the functionality will be available for the Professional plan. I’ve not tested it on the Essentials, but I believe the logic would be restricted (to only 3!)
I hope that helps!
Thank you Amy this was very helpful. I was able to convert your formula to weigh in pounds and height in inches the only difference being multiplying the weight by 703. (BMI=weight in lbs x 703/height in inches squared). For anyone who would like to check out my medical weight loss intake form: any feedback welcome!
My variables;
@BMI=0
@Weight=0
@Height=0
@seven03=703
+5Hi
This thread has been a godsend.
sure. I’ll make a Loom screen cast. One sec…
here it is:
I’m trying to calculate the BMI of the user based on their answers.
The user will type their weight(kg) and their height(cm) and i want to create a variable so that i can save the calculation and present it on the last slide as a result.
Can someone please help me as to how do i proceed?
I’m trying to calculate the BMI of the user based on their answers.
The user will type their weight(kg) and their height(cm) and i want to create a variable so that i can save the calculation and present it on the last slide as a result.
Can someone please help me as to how do i proceed?
To save the calculation and present it later you need to go to Logic → Personalize with data → Variables.
Once you have set a BMI variable, you need to return to the Branching and segmenting section (Logic → Branching, Segmenting and calculations). Go to the questions where you calculate the bmi based on weight and height and at the very end of the question click +Add rule and change If → Always add (+):
00.0 the bmi calculation TO BMI custom variable
Hi All!
I wanted to thank you for this thread as it helped ALOT with figuring out how to calculate BMI in Typeform. However, the one issues I kept running into was about 25% of respondents answering the “height in inches” question incorrectly regardless of how much I emphasized INCHES.
With that, I went back to the drawing board and split the height question into a 2 part question group. Since making the adjustment, I haven’t seen any responses come in incorrectly. Since you all helped me get started I thought I would share if others are having the same troubles!
Here is an example I added to an individual from if you want to test it out: https://hormonefitness.typeform.com/hfbmi
See screenshots below for variables and logic setup.
+5Wow! Thank you so much for sharing this,
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