What number multiplied by itself equals 255?

Here we will answer: What number multiplied by itself gives 255? In other words, what number times itself will equal 255?

We have identified many different ways of getting the answer to this question:

Algebra Method:
Make an algebra equation and solve for x:

x • x = 255
x ≈ 15.969

Square Root Method:
Take the square root of 255 to get the answer:

√255 ≈ 15.969

Exponent Method:
Make the base 255 and the exponent 0.5 to get the answer:

255^0.5 ≈ 15.969

There you go! Now you know how to calculate "What number multiplied by itself equals 255?"

The bottom line is that 15.969 times itself equals approximately 255 as illustrated here:

15.969 x 15.969 ≈ 255

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The answer on this page is rounded to the nearest thousandth, if necessary.