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http://www.tabtronics.com/TECHNOLOGY/ElectromagneticBasics/InductorBasics/tabid/ 109/Default.aspx all formula

L= (d^2 * n^2)/(18d+40l)

L is inductance in micro Henrys,d is coil diameter in inches,l is coil length in inches, andn is number of turns.

http://www.66pacific.com/calculators/coil_calc.aspx

http://home.sandiego.edu/~ekim/otherjunk/inductor.pdf Inductance for a short air core coil

http://www.tabtronics.com/TECHNOLOGY/ElectromagneticBasics/InductorBasics/tabid/109/Default.aspxhttp://www.tabtronics.com/TECHNOLOGY/ElectromagneticBasics/InductorBasics/tabid/109/Default.aspxhttp://www.tabtronics.com/TECHNOLOGY/ElectromagneticBasics/InductorBasics/tabid/109/Default.aspxhttp://www.66pacific.com/calculators/coil_calc.aspxhttp://www.66pacific.com/calculators/coil_calc.aspxhttp://home.sandiego.edu/~ekim/otherjunk/inductor.pdfhttp://home.sandiego.edu/~ekim/otherjunk/inductor.pdfhttp://home.sandiego.edu/~ekim/otherjunk/inductor.pdfhttp://www.66pacific.com/calculators/coil_calc.aspxhttp://www.tabtronics.com/TECHNOLOGY/ElectromagneticBasics/InductorBasics/tabid/109/Default.aspxhttp://www.tabtronics.com/TECHNOLOGY/ElectromagneticBasics/InductorBasics/tabid/109/Default.aspx

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http://www.coilgun.info/mark2/inductorsim.htm

http://www.newcircuits.com/article.php?id=tut001 explaination

http://www.coilgun.info/mark2/inductorsim.htmhttp://www.coilgun.info/mark2/inductorsim.htmhttp://www.newcircuits.com/article.php?id=tut001http://www.newcircuits.com/article.php?id=tut001http://www.newcircuits.com/article.php?id=tut001http://www.coilgun.info/mark2/inductorsim.htm

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http://hyperphysics.phy-astr.gsu.edu/hbase/electric/indsol.html

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/indsol.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/electric/indsol.htmlhttp://hyperphysics.phy-astr.gsu.edu/hbase/electric/indsol.html

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file:///D:/eddy%20current/desiogn%20stage/theory%20inductor/Inductor.htm http://www.circuits.dk/calculator_multi_layer_aircore.htm This formula applies at 'low' frequencies (