Unofficial LSL Reference


Unofficial LSL reference

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Function: llSqrt

float llSqrt(float fval)

Return the square root of the argument, that is, a number such that when multiplied by itself, results in the given argument.



The float value to take the square root of.

Return value

The square root of the given float.


  • If you need the square root of 2, using SQRT2 instead of calling this function will save code and processing time.
  • An input of -0.0 will return -0.0.
  • Any value less than zero will return NaN.

Short examples

float f;
f = llSqrt(4);  // sets f to 2.0 because 2*2=4
f = llSqrt(25); // sets f to 5.0 because 5*5=25
f = llSqrt(2);  // sets f to approx. 1.414214, which multiplied by itself gives approx. 2
f = SQRT2;      // same as above, but more efficient
f = llSqrt(-1); // sets f to NaN (Not a Number) under Mono; crashes under LSO

See also

  • llPow raises a number to any power.
  • SQRT2 is a constant with the square root of 2.
  • float type and associated caveats and limitations.