Home » 4th Roots » 4th Root of 81

4th Root of 81

The 4th root of 81 is the number, which multiplied by itself 4 times, is 81. In other words, this number to the power of 4 equals 81.

Besides the real values of

along with an explanation, on this page you can also find what the elements of the 4th root of 81 are called.

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



⁴√81 = ±3
This 4th Root ⇄ Number Calculator is Really Cool! Click To TweetIf you have been looking for the 4th root of eighty-one, then you are right here, too.

Fourth Root of 81

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

The term can be written as ⁴√81 or 81^1/4.

As the index 4 is even and 81 is greater than 0, 81 has two real 4th roots:

⁴√81, which is positive and called principal 4th root of 81, and -⁴√81 which is negative.

Together, they are denominated as

Although the principal fourth root of eighty-one is only one of the two 4th roots, the term “4th root of 81” 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 4th Root located in the header menu.

There, we also discuss the properties for index n = 4 by means of examples: multiplication, division, exponentiation etc.

Next, we have a look at the inverse function.

Inverse of 4th Root of 81

Extracting the 4th root is the inverse operation of ^4:

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

What is the 4th Root of 81?

You already have the answer to that question, and you also know about the inverse operation of 81 4th root.

Keep reading to learn what the parts are called.

  • ⁴√81 is the 4th root of 81 symbol
  • 4 is the index
  • 81 = radicand; the radicand is the number below the radical sign
  • 4th root = ±3
  • √ is called radical symbol or radical only

4th root of 81 = ±3

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

Now you really know all about ⁴√81, including its values, parts and the inverse.

If you need to extract the 4th root of any other real number use our calculator above.

Simply insert the number of which you want to find the 4th root (e.g. 81); the calculation is done automatically.

If you like our information about ⁴√81, then a similar 4th root you may be interested in is, for example: 4th root of 83.

In the following table you can find the n-th root of 81 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 81.

281Square Root of 81²√81±9
381Cube Root of 81³√814.3267487109
481Forth Root of 81⁴√81±3
581Fifth Root of 81⁵√812.4082246853
681Sixth Root of 81⁶√81±2.0800838231
781Seventh Root of 81⁷√811.8734440046
881Eight Root of 81⁸√81±1.7320508076
981Nineth Root of 81⁹√811.6294982222
1081Tenth Root of 81¹⁰√81±1.5518455739

A few lines down from here we review the FAQs.

Fourth Root of Eighty-One

If you have been searching for what’s the fourth root of eighty-one or 4-th root of 81, then you are reading the right post as well.

The same is true if you typed 4 root of 81 or 81 4 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 fourth roots of 81 are ±3.

Finding the 4th root of the number 81 is the inverse operation of rising the ⁴√81 to the power of 4. That is to say, (±3)4 = 81.

Further information related to ⁴√81 can be found on our page 4th Root.

Note that you can also locate roots like ⁴√81 by means of the search form in the menu and in the sidebar of this site.

If our article about the fourth √ 81 has been useful to you , then press some of the share buttons located at the bottom of this page.

If you have any questions about the 4-th root of 81, fill in the comment form below.

Websites which are related to this one can be found in the “recommended sites” section in the sidebar.

Last, but not least, don’t forget to install our absolutely free PWA app (see menu or sidebar), or to bookmark us.

And come back soon!

Thanks for your visit.