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Find √x for any zero or positive number. Negative inputs are rejected with an explanation (their roots are imaginary), so students always see the principal real root.
Principal square root of any non-negative number.
√x = the non-negative number y with y² = x
| Symbol | Meaning |
|---|---|
| x | Number to take the root of (≥ 0) |
√144 = 12 because 12² = 144. √2 ≈ 1.414214.
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It is imaginary (a multiple of i). This calculator handles real numbers only — enter 0 or a positive number.
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Click to use the Exponent Calculator and get instant results.
Click to use the Cube Root Calculator and get instant results.
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Content updated: September 2026