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Sometimes you only have say a yellow T37-6 vs a red T37-2. Can it be used? Yes but you have to adjust the # of turns and then you also have to judge if the new number of turns will fit on the toroid. I found the attached information very useful.

Is there a website that explains designing with toroids?

Is there a tool for calculating inductance?

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"

Is there a website that explains designing with toroids?

It's not really necessary. Anything that can be done with a toroid
inductor can be done with an air-wound coil. Toroids are preferred
because most of their fields are maintained inside the ring-shaped
core, meaning they produce much less interference to other inductors.
They are also small and provide good Q, as you use much less copper
wire for a given inductance than if you were to make a solenoid coil.

Is there a tool for calculating inductance?

Click on the toroid core you have and then have fun.

Ed AE7TE

The -6 and -2 identify different mixes for the ceramic formula. They not only have different Q,s and different inductance per turns, they also have different optimum operating frequencies. Spend some time on this web site: <>
Ed
AB8DF

Ed is correct about the operating frequency ranges. This website is also a wealth of info:

Peter
KF7PSM

MicroMetals produces a document called Q Curves of powdered iron cores. I see it can be downloaded at;