What is the square root of 20?

4.472136 — the square root of 20 is 4.472136. This is the number that, when multiplied by itself, equals 20. Square roots appear frequently in geometry, physics, statistics, and engineering calculations.

This calculation was generated using our Square Root Calculator. For custom values or more complex scenarios, try the full interactive calculator.

Below is the step-by-step calculation used to determine the result.

Answer

4.472136

√20 = 4.472136

Step-by-Step Solution

1

Find x where x × x = 20

2

20 is not a perfect square, so the result is irrational

3

√20 ≈ 4.472136

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