Henry to Millihenry Converter
Convert henries (H) to millihenries (mH) as you type — 1 H = 1,000 mH. Switch units, change the precision or copy the result.
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How to use this tool
Steps for using the Unit Converter.
- Enter a value in From — henries are already selected.
- The result in millihenries appears instantly. Change either unit to convert to anything else in inductance.
- Use the swap button for the reverse conversion, and set the decimal places you need.
- Turn on Show formula to see the calculation, then copy or share the result.
Example
1 H to mH
1 HmH = 1 × 1000 = 1,000 mHCommon use cases
- Inductor and choke values.
- LC filter and resonance calculations.
- Switching power-supply design.
Henry to Millihenry conversion table
| Henry (H) | Millihenry (mH) |
|---|---|
| 0.1 H | 100 mH |
| 0.5 H | 500 mH |
| 1 H | 1,000 mH |
| 2 H | 2,000 mH |
| 3 H | 3,000 mH |
| 4 H | 4,000 mH |
| 5 H | 5,000 mH |
| 10 H | 10,000 mH |
| 15 H | 15,000 mH |
| Henry (H) | Millihenry (mH) |
|---|---|
| 20 H | 20,000 mH |
| 25 H | 25,000 mH |
| 50 H | 50,000 mH |
| 75 H | 75,000 mH |
| 100 H | 100,000 mH |
| 250 H | 250,000 mH |
| 500 H | 500,000 mH |
| 1,000 H | 1,000,000 mH |
Values rounded to 6 decimal places.
Related conversions
The units
- Henry (H)
- 1 V·s/A, the SI unit of inductance. Part of the SI system.
- Millihenry (mH)
- 1/1000 H. Part of the Metric system.
How to convert henries to millihenries
Chokes and inductors in power supplies and filters are usually specified in millihenries or microhenries.
To convert henries to millihenries, use mH = H × 1000. One henry equals 1,000 millihenries, and one millihenry equals 0.001 henries.
Henry (H): 1 V·s/A, the SI unit of inductance. Millihenry (mH): 1/1000 H.
All inductance units are on the inductance converter.
Limitations
- Results are rounded to the decimal places you choose; the calculation itself keeps full precision.
Frequently asked questions
How many millihenries are in a henry?
1 H = 1,000 mH. Multiply henries by 1000 (or use mH = H × 1000).
How do I convert henries to millihenries?
Use mH = H × 1000. For example, 1 H = 1,000 mH and 10 H = 10,000 mH.
How many mH are in a henry?
1,000 mH.
How many µH are in a mH?
1,000 µH.