How it works
Find a real root of integer degree. A negative radicand requires an odd degree; the principal nonnegative root is used otherwise.
xⁿ = a
Worked example
Show example inputs and result
Radicand: 81 · Root degree: 4.
- Result
- 3
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy