Square Root Calculator
Last updated: November 5, 2026
Calculate square root, cube root, square and reciprocal for an entered number.
Square root
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- Cube root: —
- Number squared: —
- Reciprocal: —
On this page
Quick summary: Calculate square root, cube root, square and reciprocal for an entered number.
Read the complete guide
Updated reference sections in this guide are in English.
What this calculator estimates
Calculate square root, cube root, square and reciprocal for an entered number.
How to use it
Enter Number. Select Calculate to update the results.
How the calculation works
The calculator uses standard square-root, cube-root, squaring and reciprocal operations.
Worked example: starting scenario
| Number | 144 |
|---|
| Square root | 12 |
|---|---|
| Cube root | 5.241482788418 |
| Number squared | 20,736 |
| Reciprocal | 0.006944444444 |
Important limitations
Negative values have no real square root, although their cube roots are real.
Principal roots and signs
The square-root output is the nonnegative real root. For 81 it is 9, although both 9 and −9 solve x² = 81. A negative input has no real square root, while its real cube root can exist: the cube root of −8 is −2. The reciprocal is undefined at zero. Very small nonzero results use scientific notation rather than being shown as exact zero.