√27 ≈ 5.1962
√27 is an irrational number, so its decimals never end or repeat. It sits between 5 and 6 because 5² = 25 and 6² = 36.
| Decimal places | Value |
|---|---|
| 0 | 5 |
| 1 | 5.2 |
| 2 | 5.20 |
| 3 | 5.196 |
| 4 | 5.1962 |
| 5 | 5.19615 |
| 10 (digits) | 5.1961524227 |
27 = 9 × 3 and √9 = 3, so √27 = 3√3.
5.1962 × 5.1962 ≈ 27.0005, which is very close to 27.
Need another number? Use the square root calculator (also cube roots and other roots).
| Number | Square root |
|---|---|
| 23 | 4.7958 |
| 24 | 4.8990 |
| 25 | 5 |
| 26 | 5.0990 |
| 28 | 5.2915 |
| 29 | 5.3852 |
| 30 | 5.4772 |
| 31 | 5.5678 |