A worked example: 100 millihenries in microhenries
Running 100 mH through the inductance converter's real formula, converting to microhenries, returns 100,000 µH. That is the same inductor, the same physical amount of inductance, described in the smaller unit that many small-signal component datasheets prefer.
The formula: multiply by the from-unit factor, divide by the to-unit factor
The converter stores henries as the base unit, with 1 mH = 0.001 H and 1 µH = 0.000001 H. A conversion is amount × (from-unit-to-henries factor) ÷ (to-unit-to-henries factor). For 100 mH to µH, that works out to 100 × 0.001 ÷ 0.000001, which simplifies to 100 × 1,000 = 100,000 µH — exactly what the converter returns.
A second example: a 330 microhenry power inductor in millihenries and henries
A 330 µH inductor is a common choice in switching power-supply circuits. Converting it to millihenries with the same formula returns 0.33 mH — a figure that is easy to miscopy as "330 mH" if someone isn't careful about the prefix, since that would actually be 1,000 times larger. At the other extreme, a 2.2 H transformer winding converts to 2,200 mH, showing how far apart the two ends of the same product line can sit on the numeric scale.
Why inductors are rarely labeled in plain henries
A full henry represents a large amount of inductance — large enough that only substantial transformers and grid-scale chokes are naturally rated in henries. Most inductors used in power supplies, audio circuits, and RF filters fall in the millihenry or microhenry range, which is why component catalogs default to those prefixes rather than forcing every value through a string of decimal places in henries.