Inductance Converter — Henry, mH & µH

Convert between henries, millihenries, microhenries, and nanohenries.

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How this conversion works. Every unit is converted through the henry using exact SI prefixes; CGS units use factors from NIST Special Publication 811.

How to use

  1. Pick the unit you are converting from, such as Kilohenry (kH) or Henry (H).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Stathenry (statH) included.

Frequently asked questions

How do I convert millihenry to microhenry?

1 millihenry = 1000 microhenry. Choose "Millihenry (mH)" as From and "Microhenry (µH)" as To, type a value, and the result updates instantly.

How many µH are in a mH?

1,000 µH. Buck-converter inductors run 1–100 µH, audio chokes 1–100 mH, and RF inductors just a few nH.

What does 4R7 mean on an inductor?

Like resistors, the letter is the decimal point — 4R7 = 4.7 µH on most SMD power inductors (the implied unit is µH). 471 means 470 µH (47 × 10¹).

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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