Square Root Calculator
Compute square roots to four decimals — verify √144 = 12.0000 and spot irrational results instantly. Free, runs locally.
How to Use the Square Root Calculator
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Frequently Asked Questions
What is the square root of 144?
Exactly 12.0000 — every result shows four decimals with no special flag, so spot perfect squares yourself (1, 4, 9, 16 … 144) versus irrational results like √2 ≈ 1.4142.
How many decimals do I get?
Four decimals, always (√2 reads 1.4142). Round further to your homework's required places — never round mid-calculation in multi-step problems.
Can it do cube roots?
No — square roots only. For nth roots use the exponent calculator with fractional powers (e.g. 27^(1/3) = 3).
Does my number leave the browser?
No — computation runs locally in your browser. Nothing leaves your device.
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Last updated October 2026