L1 x L2 = Lx
L1 + L2 = Ly

Lx and Ly then divide up, just like odd value resistors.

Bill, remember that coils in series will also add DCR, and orientation of the coils may interact also.

I have never had reason to parallel coils as interaction would mess with that also.

What value do you need????? I can look in the basement inventory and check for you.

If you have a coil that is a higher value than what you need, then remove a few turns and measure until the value you want is reached.

Wayne, double check my work above so I don't give wrong info...

Ron

The formula for series inductance is:

LT = L1 + L2 + L3...

Likewise, for series resistance:

RT = R1 + R2 + R3...

Parallel inductance is found by:

LT = 1 / ( 1/L1 + 1/L2 + 1/L3...)

And parallel resistance by:

RT = 1 / ( 1/R1 + 1/R2 + 1/R3...)