Some old-school builders swear by the ohm meter and refuse to trust a calculator. I get it, but the math behind coil resistance is well-established. The Windbar Coil Resistance Calculator uses the standard formula that accounts for wire material, gauge, inner diameter, and wrap count. It's not a guess; it's physics.

That said, you should still verify with a meter after you build. Wraps can loosen or overlap, and the posts might not be tightened perfectly. A calculator gets you in the ballpark; a meter confirms the pitch. For a shop operator, being able to pre-calculate a build before you even wrap it is a huge time-saver.