How to Find Inductance of Coil..?

http://en.wikipedia.org/wiki/Inductor

Thank you sir,

i am not even searched in google.. sorry...

No problem, glad to have been of some help.

However, the only trustworthy way i found to get the inductance of an iron-cored coil (used for DC13 tests as per IEC 60947-5-1) was to capture the rise time of the current on an oscilloscope, and knowing the coil's resistance, compute the L from the formula I = I_max * {1-e^(-Rt/L)}

Maybe i am a little thick, but i could not get trustworthy readings from even top-of-the-line LCR meters.

One thing to note - the inductance formulae in Wikipedia, to which kvs directed you, are all without any core (except air! -which is indistinguishable from vacuum for most engineering magnetism). With a core of magnetic material, inductance depends greatly on the transverse air gaps in the core as well as the core's magnetic permeability. As kvs writes, measuring inductance on a "black box" bridge instrument can give misleading values. They often work at a fixed frequency, well away from 50 Hz (1592 Hz comes to mind) and are OK for air cored and low loss cored inductors. Solenoids and contactor coils usually have conducting housings or deliberate shorting rings - which form shorted turns and make inductance measurements 10 or 100:1 in error.