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Square Root Calculator
Find the square root of a nonnegative number and verify it by squaring the result. Decimal inputs are supported.
- Square root
- 12
- Check: root squared
- 144
How the calculation works
The square root √x is the nonnegative number y such that y² = x. For example, √144 = 12 and √0.25 = 0.5.
Inputs
- Number
Calculation details
The calculator returns the principal root. The equation y² = x has two solutions when x > 0: +√x and −√x.
Negative numbers have no real square root. Irrational roots, such as √2, are shown approximately; only the displayed answer is rounded.
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Updated: 2026-10-02