Finding the Square Root of a Number in Golang

In this blog post, we will explore a Golang program that finds the square root of a given number using the Newton-Raphson method. We will break down each step of the code to offer a clear understanding of the implementation.

The "Square Root" Golang Program

package main

import (

// findSquareRoot calculates the square root of the given number using Newton-Raphson method.
func findSquareRoot(number float64) float64 {
	// Set an initial guess for the square root (can be any positive number).
	guess := number / 2

	// Iterate using the Newton-Raphson method to refine the estimate.
	for i := 0; i < 10; i++ {
		guess = 0.5 * (guess + number/guess)

	return guess

func main() {
	// Example usage
	number := 25.0
	squareRoot := findSquareRoot(number)

	fmt.Printf("The square root of %.2f is %.4f\n", number, squareRoot)
The square root of 25.00 is 5.0000

Code Explanation

We start by defining a function called findSquareRoot, which takes a floating-point number as input and returns its square root using the Newton-Raphson method.

Inside the findSquareRoot function, we set an initial guess for the square root. A reasonable initial guess can be any positive number. In this case, we choose guess := number / 2. This initial guess can be adjusted based on the desired level of accuracy.

We then enter a loop using the Newton-Raphson method to refine the estimate of the square root. In each iteration, we update the guess value using the formula: guess = 0.5 * (guess + number/guess). The Newton-Raphson method is an iterative approach that converges rapidly to the square root of a given number.

In this example, we run the iteration 10 times. In practice, you can adjust the number of iterations based on the desired precision. More iterations will provide a more accurate result, but it might not be necessary for most applications.

The function returns the final value of guess, which represents the square root of the input number.

In the main function, we demonstrate the usage of the findSquareRoot function with an example. We create a variable number with the value 25.0.

We then call the findSquareRoot function with number as the argument and store the result in the squareRoot variable.

Finally, we use fmt.Printf to print the calculated square root with four decimal places for precision


In this blog post, we explored how to find the square root of a number in Golang using the Newton-Raphson method. Golang's standard library provides the necessary mathematical functions, making it simple to perform complex numerical calculations like square roots.

As you continue to delve into Golang's capabilities, understanding numerical methods like Newton-Raphson will significantly enhance your ability to tackle a diverse range of mathematical challenges in your programming projects. Happy coding!