Inductance Converter

Convert between henries, millihenries, microhenries, and nanohenries by entering a value and selecting source and target units. Inductance values span many orders of magnitude — RF coils sit in the nanohenry range, audio inductors in millihenries, power chokes in tens of millihenries — so a fast converter saves you from manually counting decimal places.

Entries accept scientific notation. Type 4.7e-6 H if that's what your datasheet shows; the converter normalizes the result.

Results round to four significant figures by default, which is enough for component selection. For SPICE simulations or precision filter design, copy the full unrounded value from the result panel.

The math is decimal-place shuffling: 1 H = 1,000 mH = 1,000,000 µH = 1,000,000,000 nH. Ten orders of magnitude separate the smallest practical inductance (sub-nH bond wires) from the largest (audio frequency chokes in the henry range). The SI prefix system handles all of it, but real engineers shorthand by suffix: a '4u7' on a schematic means 4.7 µH, full stop. The converter exists because nobody wants to count zeros at 11pm before a board spin.

Worked example: your buck converter datasheet specifies a 22 µH inductor for the output stage. Your distributor's catalog lists nearby values in mH (0.022 mH) and your simulation tool wants henries (2.2e-5 H). Type 22 µH and read off both — the converter shows 0.022 mH and 2.2e-5 H simultaneously. No mental arithmetic, no off-by-three errors when the BOM gets exported.

What the converter doesn't do: it ignores tolerance, saturation current, DC resistance, and self-resonant frequency — the parameters that actually pick a part. Two inductors at 22 µH can behave entirely differently if one saturates at 1A and the other at 10A. Use the converter for unit math, then go to the datasheet for the parameters that matter to circuit performance.

Quick reference for component packages: 0402 SMD inductors handle nH-µH range (RF coils, decoupling). 0805 and 1210 packages cover µH range for switching regulators. Through-hole drum-core inductors live in the high-µH to mH range. Toroidal cores reach mH to henries for power-line filtering and transformers. Each package is roughly an order of magnitude wider than the previous, which matches the inductance ranges they're designed to deliver.