python program for converter with simple code

the sample code is
def converter():
while True:
print('1. Length')
print('2. Temperature')
print('3. Calculator')
print('4. Exit')
choice = int(input('Enter your choice: '))
if choice == 1:
length_converter()
elif choice == 2:
temperature_converter()
elif choice == 3:
calculator()
elif choice == 4:
print('Goodbye')
break

def length_converter():
while True:
print('Length Converter')
print('1. Millimeter to centimeter')
print('2. Centimeter to meter')
print('3. Inch to centimeter')
print('4. Exit')
choice = int(input('Enter your choice: '))
if choice == 1:
a = int(input('Enter a millimeter: '))
b = a / 10
print('Result:', b)
elif choice == 2:
c = int(input('Enter a centimeter: '))
d = c / 100
print('Result:', d)
elif choice == 3:
n = int(input('Enter the inch: '))
h = n * 2.54
print('Result:', h)
elif choice == 4:
print('Goodbye')
break

def temperature_converter():
while True:
print('Temperature Converter')
print('1. Celsius to Fahrenheit')
print('2. Fahrenheit to Celsius')
print('3. Exit')
choice = int(input('Enter your choice: '))
if choice == 1:
e = int(input('Enter a value in Celsius: '))
f = (e * 1.8) + 32
print('Result:', f)
elif choice == 2:
g = int(input('Enter a value in Fahrenheit: '))
h = (g - 32) / 1.8
print('Result:', h)
elif choice == 3:
print('Goodbye')
break

def calculator():
while True:
print('1. Add')
print('2. Subtract')
print('3. Multiply')
print('4. Divide')
print('5. Exit')
choice = int(input('Enter your choice: '))
if choice == 1:
a = int(input('Enter your value: '))
b = int(input('Enter your value: '))
c = a + b
print('Result:', c)
elif choice == 2:
a = int(input('Enter your value: '))
b = int(input('Enter your value: '))
c = a - b
print('Result:', c)
elif choice == 3:
a = int(input('Enter your value: '))
b = int(input('Enter your value: '))
c = a * b
print('Result:', c)
elif choice == 4:
a = int(input('Enter your value: '))
b = int(input('Enter your value: '))
c = a / b
print('Result:', c)
elif choice == 5:
print('Goodbye')
break
converter()

thank you friends