Inductance Converter

Inductance describes a conductor's or circuit's ability to store energy in a magnetic field when current flows through it, and its tendency to oppose any change in that current — a property analogous to inertia in mechanical systems. A coil with high inductance resists rapid changes in current more strongly than one with low inductance, inducing a voltage proportional to the rate of current change.

Our Inductance converter supports the SI unit, henry (H), across its full metric prefix range, from the enormous exahenry down to the vanishingly small attohenry. Weber/ampere is dimensionally identical to henry, since inductance is defined as magnetic flux linkage per unit of current. The CGS system contributes two distinct historical units: abhenry (also called the EMU of inductance, equal to one nanohenry), and stathenry (also called the ESU of inductance) — these come from the electromagnetic and electrostatic CGS unit systems respectively, and differ from each other and from the henry by many orders of magnitude.

To use the converter, select your starting and target units from the dropdown lists and enter a value — the result is calculated instantly to up to 12 significant digits. For example, a typical small signal inductor rated at 100 microhenries converts to 0.0001 henry, illustrating why engineers almost always work in millihenry or microhenry scales rather than the base henry unit for everyday circuit components.

Inductance conversions come up constantly in electronics design: reading an inductor's printed or color-coded value, matching a replacement part's rating to a circuit's requirements, or calculating the time constant of an RL filter circuit (time constant = inductance ÷ resistance). Physics students encounter inductance when studying electromagnetic induction, transformers, and energy storage in magnetic fields, while electrical engineers rely on it for power-supply chokes, radio-frequency tuning circuits, and motor and transformer winding design.

All conversion factors used in this tool are drawn from standard, internationally recognized unit definitions, so results are dependable for electronics design, physics coursework, and component sourcing. The converter is free, requires no account, and works equally well on desktop and mobile devices.