Math tool
Square Root Calculator
Find the principal square root of a nonnegative number.
Free · Private · Runs in your browserRoot calculation
Find the principal square root
Enter a nonnegative number to find the value that squares back to it.
Your result will appear here after you submit a valid number.
Formula and method
The square root of x is the nonnegative number r such that r × r = x. This tool returns the principal square root.
Boundaries
- Only finite nonnegative numbers are accepted.
- Results use browser JavaScript double precision and display to eight decimal places.
- Negative numbers are rejected because this calculator stays in real-number arithmetic.
Version and verification
Calculation version 1.0.0; deterministic fixtures last verified 2026-08-20.