Inductance Converter
Convert H, mH and µH for inductors, chokes and filter calculations.
- InstantResults update as you type
- 27 categoriesFrom length to data storage
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How to use this tool
Steps for using the Unit Converter.
- Type a number into From — millihenries are preselected. Commas and scientific notation such as 2.5e3 are accepted.
- Pick the units to convert between; the result in microhenries (or whichever unit you choose) updates as you type. Use the swap button to reverse the conversion.
- Set the decimal places, turn on Show formula to see the calculation, and copy or share the result.
- Below the converter, the table lists every inductance unit with its exact definition, and the links open dedicated pages for the most common pairs.
Example
1 henries to millihenries
1 H1,000 mH
Formula: mH = H × 1000Common use cases
- Inductor and choke values.
- LC filter and resonance calculations.
- Switching power-supply design.
Inductance unit table
| Unit | Symbol | System | Definition | In henries |
|---|---|---|---|---|
| Microhenry | µH | Metric | 10⁻⁶ H | 0.000001 |
| Millihenry | mH | Metric | 1/1000 H | 0.001 |
| Henry | H | SI | 1 V·s/A, the SI unit of inductance | 1 |
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About inductance units
The henry is the SI unit of inductance: a coil has 1 H when a current changing at 1 A/s induces 1 V. Inductors in electronics are typically in millihenries and microhenries.
Limitations
- Results are rounded for display only; the calculation keeps full precision (15 significant digits).
Frequently asked questions
How many mH are in a henry?
1,000 mH.
How many µH are in a mH?
1,000 µH.
What's the plural of henry?
Both “henries” and “henrys” are accepted; the symbol is always H.
Are these inductance conversions exact?
Each unit is defined from its official definition (for example 1 inch = 2.54 cm exactly). Results are calculated in double precision and only rounded to the decimal places you choose when shown.