How to calculate a square root
Enter any non-negative number. The result is the value which, when multiplied by itself, gives the original number. For example, √25 = 5 because 5 × 5 = 25.
Square root reference
√1 = 1, √4 = 2, √9 = 3, √16 = 4, √25 = 5, √36 = 6, √49 = 7, √64 = 8, √81 = 9, √100 = 10. For non-perfect squares, the result is irrational (e.g. √2 ≈ 1.41421356).
FAQ
What is a perfect square?
A perfect square is an integer whose square root is also an integer. Examples: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100.
Can I take the square root of a negative number?
Not in the real number system. The square root of a negative number is imaginary (e.g. √−1 = i). This calculator works with real numbers only and shows the cube root for negatives.