This calculator requires the use of Javascript enabled and capable browsers. The purpose of the calculator is to determine the number of turns required for the helical primary coil. Enter the target inductance in microhenries, the coil radius and height. Click on Calculate to get the results. A sample inductance of 50 uH, a radius of 6 inches and a height of 9 inches yield 14.142135623730951 (about 14) turns required for the helical primary coil. The radius should be measured from the center of the coil to the center of the wire or tubing. The height should be measured from end to end as the coil is on the mold, from contact to contact. The coil has the general look of a toy slinky.
