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. Choose the units to convert from and to.
  2. Enter a value — the converted result updates instantly.
  3. Click Copy to copy the result to your clipboard.

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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