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How to Convert Binary to Decimal in Python? Program With Examples

In programming, having an understanding of different number systems is essential for effectively representing and manipulating data. While decimal numbers (base-10) are commonly used in our everyday lives, computers primarily operate using binary numbers (base-2). 

The knowledge to convert binary to decimal in Python is a fundamental skill for any programmer, as it enables efficient data interpretation and processing.

The binary system consists of only two digits: 0 and 1. Each digit in a binary number represents a specific power of 2. Python program to convert binary to decimal allows us to comprehend and work with binary data in a human-readable format. 

This skill is crucial in various programming domains, such as low-level programming, digital signal processing, data analysis, and cryptography.

If you are a beginner, you must check out our free Python Tutorial, or choose the expert-led Python Course. 

In this post, we will explore the process of converting binary to decimal in Python programming language. We will provide a practical guide, complete with examples, to help you understand the concept and implement binary-to-decimal conversions in your Python projects effectively. You can practice the given Python programs with the online Python Compiler. 

Python Program to Convert Binary to Decimal

Code

def binary_to_decimal(binary):
    decimal = 0
    power = 0
    while binary > 0:
        last_digit = binary % 10
        decimal += last_digit * (2 ** power)
        binary //= 10
        power += 1
    return decimal

binary_number = input("Enter a binary number: ")
decimal_number = binary_to_decimal(int(binary_number))
print("Decimal equivalent:", decimal_number)

Output

Enter a binary number: 363
Decimal equivalent: 27

Explanation

In this program, we define a function called binary_to_decimal that takes a binary number as input and returns its decimal equivalent. 

We use a while loop to iterate through each digit of the binary number. In each iteration, we extract the last digit using the modulus operator % and add it to the decimal number after multiplying it by the corresponding power of 2. 

We then update the binary number by integer division // to remove the last digit, and increment the power by 1. 

This process continues until the binary number becomes 0. Finally, we prompt the user to enter a binary number, convert it to an integer, call the binary_to_decimal function, and print the decimal equivalent.

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