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How do you add user counter to BMI calculator?

I've made this BMI calculator and I want the user count at the bottom to count every time the user has used the BMI calculator by entering "y". I can't seem to get the code to work. Any help?
user_continue = "y"
counter = 0
while user_continue == "y":
weight = float(input("What is your weight? (KG) "))
height = float(input("What is your height? (Metres) "))
#formula to convert weight and height to users bmi
bmi = weight/(height*height)
print("Your BMI is", bmi)
#indicators to state if user is either underwieght, overweight or normal
if bmi < 18:
print("It indicates you underweight.")
elif bmi >= 18 and bmi < 25:
print("It indicates you are within normal bounds.")
elif bmi >= 25:
print("It indicates you are overweight.")
user_continue = input("Add Another BMI? y/n: ")
# add counter
if user_continue != "y":
counter+=1
print(counter)
print("\t\tThank You for using BMI calculator by Joe Saju!")
print("\n\t\t\t\tPress ENTER to Exit.")
break

You want to increase the counter in any iteration of the loop so you need increase the counter variable inside the loop but not in the ending if statement.
Tip: increase counter variable at the begining of the loop(like in the code below)
In your case the counter increase only if the user want exit. so it will counter only one time.
user_continue = "y"
counter = 0
while user_continue == "y":
# increase the counter at the begining
counter+=1
weight = float(input("What is your weight? (KG) "))
height = float(input("What is your height? (Metres) "))
#formula to convert weight and height to users bmi
bmi = weight/(height*height)
print("Your BMI is", bmi)
#indicators to state if user is either underwieght, overweight or normal
if bmi < 18:
print("It indicates you underweight.")
elif bmi >= 18 and bmi < 25:
print("It indicates you are within normal bounds.")
elif bmi >= 25:
print("It indicates you are overweight.")
user_continue = input("Add Another BMI? y/n: ")
if user_continue != "y":
# counter+=1 line removed and moved to the begining
print(counter)
print("\t\tThank You for using BMI calculator by Joe Saju!")
print("\n\t\t\t\tPress ENTER to Exit.")
break

defhealthindex function does not happen while loop does not execute

I cannot get the healthindex function to work. Even when I input b or h, nothing happens the while loop does not execute. I tried to make it so the input would make two seperate segments of code happen based on the input, but that is not happening. Thank you!
def inputM():
print("Enter weight in kg")
weightm = float(input())
print("Enter heigh in meters")
heightm = float(input())
return weightm, heightm
def inputI():
print("Enter weight in pounds")
weighti = float(input())
print("Enter height in inches")
heighti = float(input())
return weighti, heighti
def healthindex (BMIList, BMINum, bmi):
if healthy == "b":
print (str(bmi))
elif healthy == "h":
index = 0
print ("Your bmi is" + (str(bmi))
while index < len(BMIList):
if bmi < BMINum[index]:
print ("And, you are " + BMIList[index])
return
index = index + 1
print("You are Obese")
return
BMIList = ["severly underweight", "underweight", "healthy", "overweight", "obese"]
BMINum = [12, 18.4, 24.9, 29.9, 200]
print("Welcome to BMI Calculator!")
print("Enter I for Imperial or M for Metric")
request = input().upper()
if request == "M":
weightm, heightm = inputM()
bmi = weightm/(heightm**2)
elif request == "I":
weighti, heighti = inputI()
bmi = (703*weighti)/(heighti**2)
else:
print("Invalid input")
print("Enter b to only see your bmi or enter h if you would like to see your bmi and health index")
healthy= input()
healthindex (BMIList, BMINum, bmi)

You should also pass healthy variable to the healthindex function
healthindex (BMIList, BMINum, bmi, healthy)
Full code
def inputM():
print("Enter weight in kg")
weightm = float(input())
print("Enter heigh in meters")
heightm = float(input())
return weightm, heightm
def inputI():
print("Enter weight in pounds")
weighti = float(input())
print("Enter height in inches")
heighti = float(input())
return weighti, heighti
def healthindex (BMIList, BMINum, bmi, healthy):
if healthy == "b":
print (str(bmi))
elif healthy == "h":
index = 0
print ("Your bmi is " + (str(bmi)))
while index < len(BMIList):
if bmi < BMINum[index]:
print ("And, you are " + BMIList[index])
return
index = index + 1
print("You are Obese")
return
BMIList = ["severly underweight", "underweight", "healthy", "overweight", "obese"]
BMINum = [12, 18.4, 24.9, 29.9, 200]
print("Welcome to BMI Calculator!")
print("Enter I for Imperial or M for Metric")
request = input().upper()
if request == "M":
weightm, heightm = inputM()
bmi = weightm/(heightm**2)
elif request == "I":
weighti, heighti = inputI()
bmi = (703*weighti)/(heighti**2)
else:
print("Invalid input")
print("Enter b to only see your bmi or enter h if you would like to see your bmi and health index")
healthy= input()
healthindex (BMIList, BMINum, bmi, healthy)

...
def healthindex (preference, bmi):
if preference == "b":
print (str(bmi))
elif preference == "h":
index = 0
print ("Your bmi is" + (str(bmi)))
while index < len(BMIList):
if bmi < BMINum[index]:
print ("And, you are " + BMIList[index])
return
index = index + 1
print("You are Obese")
return
...
healthindex (healthy, bmi)
... refers to unchanged codes

BMI Index in Python

I need help with doing the code for my homework, I have a feeling I could be missing something, your help/feedback would be greatly appreciated!
Sincerely
Meredith
def calc_BMI():
weight=requestNumber("Enter weight (kg)")
height=requestNumber("Enter Height (meters)")
bmi=(weight/(height*height))
print 'Your BMI in %2f' % bmi
if bmi=<15
print('Your weight status is Very Severely Underweight')
elif bmi>=15.0 and bmi<=16.0
print ('Your weight status is Severely Underweight')
elif bmi>=16.0 and bmi<=18.5
print ('Your weight status is Underweight')
elif bmi>= 18.5 and bmi <=25
print('Your weight staus is Normal')
elif bmi >=25 and bmi <=30
print ('Your weight status is Overweight')
elif bmi>=30 and bmi <=35
print ('Your weight status is Moderately Obese')
elif bmi >=35 and bmi<=40
print ('Your weight status is Severely Obese')
elif bmi <=40
print ('Your weight status is Very Severely Obese')

Your code has multiple issue:
Will list them out here:
requestNumber is not a method in python. Either import a library which has this method. Or use the default input method.
weight = requestNumber("Enter weight (kg)")
instead
weight = input("Enter weight (kg)")
at the end of if coundition you should have a ':'
eg: if bmi <= 15:
Also if bmi=<15 is wrong. it should be if bmi <= 15:
remove the enter code here part from your questions.
elif bmi >=35 and bmi<=40 enter code here
Bug in your code in the last but 1 line. It should be >=
elif bmi <=40
print ('Your weight status is Very Severely Obese')
Working code:
def calc_BMI():
weight = input("Enter weight (kg)")
height = input("Enter Height (meters)")
bmi = (int(weight)/(float(height)**2))
print('Your BMI in %2f' % bmi)
if bmi <= 15:
print('Your weight status is Very Severely Underweight')
elif bmi >= 15.0 and bmi <= 16.0:
print ('Your weight status is Severely Underweight')
elif bmi >= 16.0 and bmi<= 18.5:
print ('Your weight status is Underweight')
elif bmi >= 18.5 and bmi <= 25:
print('Your weight staus is Normal')
elif bmi >= 25 and bmi <= 30:
print('Your weight status is Overweight')
elif bmi >= 30 and bmi <= 35:
print('Your weight status is Moderately Obese')
elif bmi >= 35 and bmi <= 40:
print('Your weight status is Severely Obese')
elif bmi >= 40:
print('Your weight status is Very Severely Obese')
Output:
calc_BMI()
Enter weight (kg)78
Enter Height (meters)1.8
Your BMI in 24.074074
Your weight staus is Normal
Helpful notes:
Try to follow coding convention like pep-8 maybe [Link]
Indent your code properly. See how I have added space before and after '>='. This is also a part of pep-89 convention.
eg: if weight >= 40:

There were several errors in your code,I have commented the problems:
def calc_BMI():
weight=int(input("Enter weight (kg)"))#make sure value taken is int
height=float(input("Enter Height (meters)"))#make sure value taken is float
bmi=(weight/(height**2))#use the power operator for squaring instead
print ('Your BMI in %2f' % bmi)
if bmi <= 15 :#colon eexpected
print('Your weight status is Very Severely Underweight')
elif bmi>=15.0 and bmi<=16.0:#colon eexpected
print ('Your weight status is Severely Underweight')
elif bmi>=16.0 and bmi<=18.5:#colon eexpected
print ('Your weight status is Underweight')
elif bmi>= 18.5 and bmi <=25 :#colon eexpected
print('Your weight staus is Normal')
elif bmi >=25 and bmi <=30:#colon eexpected
print ('Your weight status is Overweight')
elif bmi>=30 and bmi <=35:#colon eexpected
print ('Your weight status is Moderately Obese')
elif bmi >=35 and bmi<=40:#colon eexpected
print ('Your weight status is Severely Obese')
else:#no need for a elif,rather use else for the rest
print('Your weight status is Very Severely Obese')
calc_BMI()# call the function to run

Im tring to make a BMI BMR calculator in Pythion3

well i am trying to make a bmi & bmr calculator.
I have got the code down yet when i select bmi, it goes through the bmi process then immediately after it has finished it runs the mbr, then the program crashes?
HALP?
#menu
#Ask weather to print BMI or BMR
output = str(input('Calulate BMI or BMR or Exit: '))
print (output)
#BMI
if output == 'BMI' or 'bmi':
#Get height and weight values
height = int(input('Please enter your height in inches: '))
weight = int(input('Please enter your weight in pounds: '))
#Do the first steps of the formula
heightSquared = (height * height)
finalWeight = (weight * 703)
#Fiqure out and print the BMI
bmi = finalWeight / heightSquared
if bmi < 18:
text = 'Underweight'
if bmi <= 24: # we already know that bmi is >=18
text = 'Ideal'
if bmi <= 29:
text = 'Overweight'
if bmi <= 39:
text = 'Obese'
else:
text = 'Extremely Obese'
print ('Your BMI is: ' + str(bmi))
print ('This is: ' + text)
#bmr
if output == 'bmr' or 'BMR':
gender = input('Are you male (M) or female (F) ')
if gender == 'M' or 'm':
#Get user's height, weight and age values.
height = int(input('Please enter your height in inches'))
weight = int(input('Please enter your weight in pounds'))
age = int(input('Please enter your age in years'))
#Figure out and print the BmR
bmr = 66 + (6.2 * weight) + (12.7 * height) - (6.76 * age)
print (bmr)
if gender == 'F' or 'f':
#Get user's height, weight and age values.
height = int(input('Please enter your height in inches'))
weight = int(input('Please enter your weight in pounds'))
age = int(input('Please enter your age in years'))
#Figure out and print the BmR
bmr = 655 + (4.35 * weight) + (4.7 * height) - (4.7 * age)
print (bmr)
#exit
elif output == 'exit' or 'Exit' or 'EXIT':
exit()
Any help is welcome!
Cheers!

There are many bugs or inconsistencies within your code, here are a few main ones.
The or logical operator cannot be used like that, this is most prominent in the main if statements. Here is a tutorial to get you started on that.
The if and elif are very badly used, if is for a condition, elif is run if the subsequent if hasn't been satisfied, and if the code within the elif has, while the third one, else is more of a default statement, per se, if nothing was satisfied go to this one. Here is some documentation about it.
You are reusing the same code way too much, this should be fixed.
There are a few other tidbits that will show themselves in the code below, I've heavily commented the code so you can understand it thoroughly.
# Menu
# Ask whether to print BMI, BMR, or to exit
output = str(input('Calulate BMI or BMR or Exit: '))
print ('You entered: ' + output) # Try not to print 'random' info
# Exit, I put it up here to make sure the next step doesn't trigger
if output == 'exit' or output == 'Exit' or output == 'EXIT':
print('Exiting...') # Try to always notify the user about what is going on
exit()
# Check if the input is valid
if output != 'BMI' and output != 'bmi' and output != 'BMR' and output != 'bmr':
print('Please enter a valid choice.')
exit()
# Get user's height, weight and age values
# Never write code more than once, either place it in a function or
# take it elsewhere where it will be used once only
height = int(input('Please enter your height in inches: '))
weight = int(input('Please enter your weight in pounds: '))
# BMI
if output == 'BMI' or output == 'bmi':
# Do the first steps of the formula
heightSquared = (height * height)
finalWeight = (weight * 703)
# Figure out and print the BMI
bmi = finalWeight / heightSquared
if bmi < 18: # First step, is it less than 18?
text = 'Underweight'
elif bmi <= 24: # If it isn't is it less than or equal to 24?
text = 'Ideal'
elif bmi <= 29: # If not is it less than or equal to 29?
text = 'Overweight'
elif bmi <= 39: # If not is it less than or equal to 39?
text = 'Obese'
else: # If none of the above work, i.e. it is greater than 39, do this.
text = 'Extremely Obese'
print ('Your BMI is: ' + str(bmi))
print ('This is: ' + text)
# BMR
elif output == 'bmr' or output == 'BMR':
gender = str(input('Are you male (M) or female (F): '))
age = int(input('Please enter your age in years: '))
bmr = 0 # Initialize the bmr
if gender == 'M' or gender == 'm':
# Figure out and print the BMR
bmr = 66 + (6.2 * weight) + (12.7 * height) - (6.76 * age)
if gender == 'F' or gender == 'f':
# Figure out and print the BMR
bmr = 655 + (4.35 * weight) + (4.7 * height) - (4.7 * age)
print ('Your BMR is: ' + bmr)

How to add a counter function?

So i need to count how many times BMI is calculated and for it to print at the end of this loop. Any ideas?
print("Hello and welcome to the BMI calculator!!")
user = input("Would you like to go again, Y/N: ")
while user == "y":
height = int(input("Please put in your height in Meters: "))
weight = int(input("Please put in your weight in Kilogram: "))
BMI = weight/ (height*height)
if BMI < 18:
print("Your BMI is:", BMI, "Eat some more Big Macs, you are too skinny!")
elif BMI > 25:
print("Your BMI is:", BMI, "Stop eating all those Big Macs, you are far too fat!")
elif BMI >18 < 25:
print("Your BMI is:", BMI, "You are a normal and healthy weight, congratulations!!!")
user = input("Would you like to go again, Y/N: ")
input("\nPress the enter key to exit")

Fairly simple. Just make a variable outside the loop, and increment it every time the loop begins.
print("Hello and welcome to the BMI calculator!!")
count = 0;
user = input("Would you like to go again, Y/N: ")
while user == "y":
count += 1 #Increase count by one
height = int(input("Please put in your height in Meters: "))
weight = int(input("Please put in your weight in Kilogram: "))
BMI = weight/ (height*height)
if BMI < 18:
print("Your BMI is:", BMI, "Eat some more Big Macs, you are too skinny!")
elif BMI > 25:
print("Your BMI is:", BMI, "Stop eating all those Big Macs, you are far too fat!")
elif BMI >18 < 25:
print("Your BMI is:", BMI, "You are a normal and healthy weight, congratulations!!!")
user = input("Would you like to go again, Y/N: ")
print("You checked your BMI", count, "times.")
input("\nPress the enter key to exit")