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Project: Temperature Converter

Practice the Python project—that converts between Celsius, Fahrenheit, and Kelvin.

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Create a Python program that converts temperatures between Celsius, Fahrenheit, and Kelvin. The goal is to help learners understand basic input handling, conditionals, arithmetic operations, and functions—all in a practical, real-world context.

Goals

By the end of this project, you’ll be able to:

  • Convert temperatures between Celsius, Fahrenheit, and Kelvin.

  • Use input() to get user input.

  • Apply conditionals (if, elif, else) to control program flow.

  • Use functions to organize code for reusability and clarity.

  • Handle invalid input gracefully.

Project breakdown

  • Print a welcome message, explain the conversion options, and prompt the user to choose one.

  • Get the user’s choice and the temperature to convert; handle invalid input.

  • Write a separate function for each type of temperature conversion.

  • Use if/elif/else to call the correct function and display the result.

Step 1: Program setup

  • Print a welcome message.

  • Explain the available conversion types.

  • Prompt the user to choose a conversion type (e.g., Celsius to Fahrenheit).

print("🌡️ Welcome to the Temperature Converter!")
print("Choose a conversion:")
print("1: Celsius to Fahrenheit")
print("2: Fahrenheit to Celsius")
print("3: Celsius to Kelvin")
print("4: Kelvin to Celsius")
print("5: Fahrenheit to Kelvin")
print("6: Kelvin to Fahrenheit")
Project setup

Step 2: Take the user input

  • Get the user’s choice (conversion type).

  • Ask for the temperature to convert.

  • Convert the input to a float.

choice = input("Enter your choice (1-6): ")
temp = float(input("Enter the temperature to convert: "))
Take user input

Step 3: Define conversion functions

Create separate functions for each conversion type:

def celsius_to_fahrenheit(c):
    return (c * 9/5) + 32

def fahrenheit_to_celsius(f):
    return (f - 32) * 5/9

def celsius_to_kelvin(c):
    return c + 273.15

def kelvin_to_celsius(k):
    return k - 273.15

def fahrenheit_to_kelvin(f):
    return (f - 32) * 5/9 + 273.15

def kelvin_to_fahrenheit(k):
    return (k - 273.15) * 9/5 + 32
Conversion functions

Step 4: Perform the conversion

Use conditionals to check the user’s choice and call the appropriate function:

if choice == "1":
    result = celsius_to_fahrenheit(temp)
    print("{}°C is {:.2f}°F".format(temp, result))
elif choice == "2":
    result = fahrenheit_to_celsius(temp)
    print("{}°F is {:.2f}°C".format(temp, result))
elif choice == "3":
    result = celsius_to_kelvin(temp)
    print("{}°C is {:.2f}K".format(temp, result))
elif choice == "4":
    result = kelvin_to_celsius(temp)
    print("{}K is {:.2f}°C".format(temp, result))
elif choice == "5":
    result = fahrenheit_to_kelvin(temp)
    print("{}°F is {:.2f}K".format(temp, result))
elif choice == "6":
    result = kelvin_to_fahrenheit(temp)
    print("{}K is {:.2f}°F".format(temp, result))
else:
    print("Invalid choice. Please run the program again.")
Perform conversion

Tips

  • Use while loops to allow repeated conversions without restarting the program.

  • Add input validation to avoid errors.

  • Use try/except blocks to handle non-numeric input.

  • Let users type temperature units as text (e.g., "C" to "F") instead of numbers.

  • Add ASCII thermometer graphics for fun

Mini challenge

Let the user convert multiple temperatures in one run and log the results in a list. At the end, print all conversions done during the session.

Use a while loop to let users keep converting temperatures, and store each result in a list. Exit the loop with a special input like 'q', then print the list at the end.

# Modidy the code below to let the users convert multiple temperatures in one run and log the results in a list. 
# At the end, print all conversions done during the session.
print("🌡️ Welcome to the Temperature Converter!")
print("Choose a conversion:")
print("1: Celsius to Fahrenheit")
print("2: Fahrenheit to Celsius")
print("3: Celsius to Kelvin")
print("4: Kelvin to Celsius")
print("5: Fahrenheit to Kelvin")
print("6: Kelvin to Fahrenheit")
choice = input("Enter your choice (1-6): ")
temp = float(input("Enter the temperature to convert: "))
def celsius_to_fahrenheit(c):
    return (c * 9/5) + 32

def fahrenheit_to_celsius(f):
    return (f - 32) * 5/9

def celsius_to_kelvin(c):
    return c + 273.15

def kelvin_to_celsius(k):
    return k - 273.15

def fahrenheit_to_kelvin(f):
    return (f - 32) * 5/9 + 273.15

def kelvin_to_fahrenheit(k):
    return (k - 273.15) * 9/5 + 32
Mini challenge on temperature conversion

If you’re stuck, click the “Show Solution” button.

Go further

  • Add a graphical interface using Tkinter.

  • Create a web version using Flask or Streamlit.

  • Save conversion history to a file.

You just built a useful Python utility that practices input handling, math, and logic. Keep experimenting and try personalizing it with your creative twist!