0.1
0.0001
H
0.001
0.1
0.0001
H
0.001
The Inductance Converter converts between all standard units of electrical inductance, from picohenries to kilohenries. Inductance, measured in henries (H), is a property of conductors that opposes changes in current flow by generating a counter-electromotive force (back-EMF).
The henry is defined as the inductance that produces one volt of EMF when the current changes at one ampere per second (V·s/A). Named after Joseph Henry, who independently discovered electromagnetic induction around the same time as Michael Faraday, the henry is fundamental to transformer design, motor theory, and radio frequency engineering.
Inductance values in practical applications range from picohenries (pH) for parasitic trace inductance on PCBs, nanohenries (nH) for RF chip inductors and ferrite beads, microhenries (µH) for DC-DC converter inductors and RF coils, millihenries (mH) for audio crossover networks and filter chokes, to henries (H) for power transformer windings and large filter inductors.
Understanding inductance conversion is essential for filter design (cutoff frequency = 1/(2π√(LC))), switching power supply design, motor and transformer analysis, and RF circuit design. The energy stored in an inductor is E = ½LI², which is critical for power converter design.
Modern surface-mount inductors for electronics typically range from 1 nH to 1 mH. Power inductors for switching regulators are commonly 1–100 µH. Large iron-core inductors for power systems may be 0.1–10 H.
All values are normalized to henries (H). SI prefix conversions: pico = 10⁻¹², nano = 10⁻⁹, micro = 10⁻⁶, milli = 10⁻³, kilo = 10³. These are exact conversion factors.
Inductor Q factor (quality factor) = X_L/R = 2πfL/R, where f is frequency, L is inductance, and R is DC resistance. Higher Q means less loss. Typical Q values: 10–50 for power inductors, 50–200 for RF inductors.
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Results
100 µH = 0.1 mH
Inputs
Results
4700 nH = 4.7 µH
The henry (H) is the SI unit of inductance. It equals one volt-second per ampere (V·s/A). An inductor of 1 H produces 1 V of EMF when current changes at 1 A/s.
Divide microhenries by 1000. For example, 470 µH = 0.47 mH.
DC-DC converter inductors typically range from 1 µH to 100 µH depending on switching frequency and current. Higher frequencies allow smaller inductors.
Nanohenries measure very small inductances in RF circuits, parasitic inductances of PCB traces, and chip inductors for high-frequency filtering and matching networks.
Inductive reactance X_L = 2πfL. At higher frequencies, an inductor presents more opposition to current flow. This is the basis for inductive filters and RF chokes.
Mutual inductance is the inductance shared between two coupled coils (as in a transformer). It is measured in henries and relates the voltage induced in one coil to the current change in the other.
Inductance depends on: number of turns squared, core material permeability, core cross-sectional area, and coil length. L = µN²A/l.
1 nH = 1000 pH. Picohenries measure the smallest inductances, typically parasitic inductances of short traces, bond wires, and component leads.
Divide millihenries by 1000. For example, 100 mH = 0.1 H.
Ferrite beads typically have inductances of 10 nH to 1 µH, but their primary purpose is to provide frequency-dependent impedance for EMI suppression rather than a specific inductance.
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The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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