// Tutorial //

Python Convert String to float

Published on August 3, 2022
Default avatar
By Pankaj
Developer and author at DigitalOcean.
Python Convert String to float

While we believe that this content benefits our community, we have not yet thoroughly reviewed it. If you have any suggestions for improvements, please let us know by clicking the “report an issue“ button at the bottom of the tutorial.

We can convert a string to float in Python using the float() function. This is a built-in function used to convert an object to a floating point number. Internally, the float() function calls specified object __float__() function.

Python Convert String to float

Let’s look at a simple example to convert a string to float in Python.

s = '10.5674'

f = float(s)

print('Float Value =', f)


<class 'float'>
Float Value = 10.5674

Why do we need to convert a string to float?

If we are getting float value from user input through the terminal or reading it from a file, then they are string objects. We have to explicitly convert them to float so that we can perform necessary operations on it, such as addition, multiplication, etc.

input_1 = input('Please enter first floating point value:\n')
input_1 = float(input_1)

input_2 = input('Please enter second floating point value:\n')
input_2 = float(input_2)

print(f'Sum of {input_1} and {input_2} is {input_1+input_2}')

python convert string to float

Ideally, we should use try-except block to catch exceptions in case of invalid input from user. If you are not familiar with string formatting using f prefix, please read f-strings in Python.

Python Convert float to String

We can convert float to a string easily using str() function. This might be required sometimes where we want to concatenate float values. Let’s look at a simple example.

f1 = 10.23
f2 = 20.34
f3 = 30.45

# using f-string from Python 3.6+, change to format() for older versions
print(f'Concatenation of {f1} and {f2} is {str(f1) + str(f2)}')
print(f'CSV from {f1}, {f2} and {f3}:\n{str(f1)},{str(f2)},{str(f3)}')
print(f'CSV from {f1}, {f2} and {f3}:\n{", ".join([str(f1),str(f2),str(f3)])}')


Concatenation of 10.23 and 20.34 is 10.2320.34
CSV from 10.23, 20.34 and 30.45:
CSV from 10.23, 20.34 and 30.45:
10.23, 20.34, 30.45

If we don’t convert float to string in the above program, the join() function will throw an exception. Also, we won’t be able to use + operator to concatenate as it will add the floating point numbers.

You can checkout complete python script and more Python examples from our GitHub Repository.

Reference: float() official documentation

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in our Questions & Answers section, find tutorials and tools that will help you grow as a developer and scale your project or business, and subscribe to topics of interest.

Sign up
About the authors
Default avatar


Developer and author at DigitalOcean.

Still looking for an answer?

Was this helpful?