How it works
Find the nonnegative number whose square equals the input. Negative inputs have no real square root.
x = √a
Worked example
Show example inputs and result
Radicand: 144.
- Result
- 12
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