# Inductance Calculator For Spiral Flat CoilsThis **calculator** requires the use of **Javascript** enabled and capable browsers. The
purpose of the calculator is to determine the **inductance** of a spiral flat primary **coil**. Enter then number of turns in the coil, one
half of the coil radius (also called average radius) and the width of the
coil. Click on Calculate to get the results. A sample 14 turns, half
radius of 3 inches and a width of 12 inches yield an inductance of
11.307692307692308 **microhenries**. The radius should be measured from
the center of the coil to the center of the exterior wire or tubing. The
width (diameter) should be measured from side to side. The coil has the
general look of a heating element on an electric range.
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