Square Root Calculator
Calculate the square root of any non-negative number instantly.
Formula: √x
About Square Root Calculator
Square Root Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate the square root of any non-negative number instantly.
The calculation uses the standard formula √x and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
The square root of 2 (about 1.41421) was the first number proven to be irrational, by the ancient Greeks.
Frequently Asked Questions
Is Square Root Calculator free to use?
Yes. Square Root Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (√x) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
Can I take the square root of a negative number?
Not within the real numbers. Negative numbers have imaginary square roots (e.g. √−9 = 3i), which this calculator does not cover.
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