Cube Root Calculator

The radicand. Negative values are allowed; an even root of a negative number is imaginary.
Multiplies the root, so 3 with 18 gives 3 sqrt(18) = 9 sqrt(2).
Root
3
Square Root and Nth Root Calculator
Rounded root
3
Exact (simplified radical)
3
Factor outside the radical
3
Radicand left inside
1
Perfect power?
Yes
Check (root raised to the index)
27
Expression
cbrt(27) = 3 = 3
Worked out from NIST Digital Library of Mathematical Functions, 4.2(i) Powers and Roots and 1 other source.

How this is worked out

2 steps
  1. 27 is a perfect 3th power: 3^3 = 27.
  2. Decimal value: 3 = 3.

Results are general information, not financial, tax, legal, medical or engineering advice.