Square root calculator
Find the nonnegative number whose square is your input.
Formula
Root = √x, where x ≥ 0
Principal square root ≈ sqrt((25))
How to use
- Enter a nonnegative number.
- Read its principal square root.
- Square the result to check, allowing for rounding.
Examples
- √25 = 5.
- √0.0625 = 0.25.
Frequently asked questions
Why is √25 shown as 5, not ±5?
The radical means the principal nonnegative root. The equation x²=25 has two solutions.
Can I enter a negative number?
No. Negative numbers do not have real square roots.
Is √2 exact on screen?
No. Its decimal expansion is infinite, so the display is rounded.
Sources
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