What is the Square Root of 8? Information and Calculator (2024)

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The square root of 8 is the number, which multiplied by itself 2 times, is 8. In other words, this number to the power of 2 equals 8.

Besides the real values of

along with an explanation, on this page you can also find what the elements of the square root of 8 are called.

In addition to the terminology, we have a calculator you don’t want to miss:



²√8 = ±2.8284271247

If you have been looking for the square root of eight, then you are right here, too.

Second Root of 8

In this section we provide you with important additional information about the topic of this post:

The term can be written as ²√8 or 8^1/2.

As the index 2 is even and 8 is greater than 0, 8 has two real square roots:

²√8, which is positive and called principal square root of 8, and -²√8 which is negative.

Together, they are denominated as

Although the principal square root of eight is only one of the two square roots, the term “square root of 8” usually refers to the positive number, that is the principal square root.

If you want to know how to find the value of this root, then read our article Square Root located in the header menu.

There, we also discuss the properties for index n = 2 by means of examples: multiplication, division, exponentiation etc.

Next, we have a look at the inverse function.

Inverse of Square Root of 8

Extracting the square root is the inverse operation of ^2:

In the following paragraph, we are going to name the elements of this √.

What is the Square Root of 8?

You already have the answer to that question, and you also know about the inverse operation of 8 square root.

Keep reading to learn what the parts are called.

  • ²√8 is the square root of 8 symbol
  • 2 is the index
  • 8 = radicand; the radicand is the number below the radical sign
  • Square root = ±2.8284271247
  • √ is called radical symbol or radical only

Second root of 8 = ±2.8284271247

As a sidenote: All values on this page have been rounded to ten decimal places.

Now you really know all about ²√8, including its values, parts and the inverse.

If you need to extract the 2nd root of any other real number use our calculator above.

Simply insert the number of which you want to find the square root (e.g. 8); the calculation is done automatically.

If you like our information about ²√8, then a similar square root you may be interested in is, for example: square root of 10.

In the following table you can find the n-th root of 8 for n = 2,3,4,5,6,7,8,9,10.


The aim of this table is to provide you with an overview of the nth roots of 8.

28Square Root of 8²√8±2.8284271247
38Cube Root of 8³√82
48Forth Root of 8⁴√8±1.6817928305
58Fifth Root of 8⁵√81.5157165665
68Sixth Root of 8⁶√8±1.4142135624
78Seventh Root of 8⁷√81.3459001926
88Eight Root of 8⁸√8±1.2968395547
98Nineth Root of 8⁹√81.2599210499
108Tenth Root of 8¹⁰√8±1.2311444133

A few lines down from here we review the FAQs.

Square Root of Eight

If you have been searching for what’s the square root of eight or 2nd root of 8, then you are reading the right post as well.

The same is true if you typed 2 root of 8 or 8 2 root in the search engine of your preference, just to name a few similar terms.

If something remains unclear do not hesitate getting in touch with us.

We are constantly trying to improve our site, and truly appreciate your feedback.

Ahead is the wrap-up of our information.


To sum up, the square roots of 8 are ±2.8284271247; the positive real value is the principal.

Finding the second root of the number 8 is the inverse operation of rising the ²√8 to the power of 2. That is to say, (±2.8284271247)2 = 8.

Further information about the root of a number like ²√8 can be found on our page n-th Root.

Note that you can also locate roots of real numbers such as ²√8 by means of the search form in the menu and in the sidebar of this site.

If our article about the square √ 8 has been useful to you , then press some of the share buttons located at the bottom of this page.

BTW: A term closely related to square roots is perfect square. We tell you everything about perfect squares in our article Square Numbers.

If you have any questions about the 2nd root of 8, fill in the comment form below.

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And come back soon!

Thanks for your visit.

– Article written by Mark, last updated on November 26th, 2023

What is the Square Root of 8? Information and Calculator (2024)
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