Enter an inductance value and choose the units to convert between henries and its milli-, micro-, and nanohenry multiples.
How to Use the Electrical Inductance Conversion Calculator
Choose the unit your inductance value is currently in, choose the unit you need it in, and enter the number — henries, millihenries, microhenries, or nanohenries. The converted result appears as soon as the value changes.
Inductance measures a component's opposition to a changing current, and like resistance, it earns a full SI unit of its own — the henry, named for Joseph Henry, who discovered electromagnetic self-inductance independently of, and slightly before, Michael Faraday published the same phenomenon in 1831.
base value (H) = entered value × from-unit factor
result = base value ÷ to-unit factor
1 mH = 10⁻³ H
1 µH = 10⁻⁶ H
1 nH = 10⁻⁹ HA full henry is a large inductance by component standards — power-supply chokes and audio crossover inductors typically land in the single- to double-digit millihenry range. Drop further down and RF circuits, where inductors have to respond to signals oscillating millions of times a second, work in microhenries and even nanohenries; a tiny surface-mount inductor on a Wi-Fi module's matching network might specify just a few nanohenries.
The scale matters because inductive reactance — how much an inductor resists AC current — depends on both inductance and frequency (X_L = 2πfL). A millihenry inductor that's negligible at 60 Hz becomes a serious impedance at 100 MHz, which is exactly why RF designers reach for nanohenry-scale parts instead of scaling a power-supply inductor down.