Square Roots

Pick a value to view its full reference table.

The square root of 1 is about 1. Square roots reverse squaring and are essential in geometry and the quadratic formula.

A square root reverses a square: where squaring counts the area of a square, the root recovers its side. Some roots come out whole — the perfect squares — while the rest are irrational, decimals that neither end nor repeat. This section walks every value from 1 to 30, separates exact from irrational cases with arguments you can check by hand, and links the square-root calculator for values beyond the table.

All 30 square roots pages include a full data table, a worked explanation, and related calculators. Start withnumber 1or jump straight to the value you need below.

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30