The free demo version of EZNEC (http://eznec.com) will tell you. Choose
a low frequency where the loop is electrically very small. Put a source
anywhere in the loop and look at the Source Data. It'll give you the
reactance which you can convert to inductance at the frequency you
chose. The inductance should stay fairly constant with frequency as long
as the frequency is low enough that the loop circumference is a very
small part of a wavelength.

Roy Lewallen, W7EL

TRABEM wrote:
What's the approximate inductance for a single turn square loop, 10
feet per side in free space (if that matters)? There should be an easy
way to calculate this, maybe there is, but I'm not aware of it.

Thanks

T