The henry (H) is the SI unit of inductance, describing the voltage induced per unit rate of change of current.
Henrys to Millihenrys
Convert Henry (H) to Millihenry (mH) instantly with an exact formula, conversion table, and FAQ.
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Convert henrys (H) to millihenrys (mH) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A Millihenry (mH) equals 1/1,000 henry(s), a scaled unit of inductance used for milli-scale electrical work.
mH = H × 1000
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Formula
mH = H × 1000
H = mH × 0.001
Conversion table
| 1 H | 1000 mH |
| 5 H | 5000 mH |
| 10 H | 10000 mH |
| 20 H | 20000 mH |
| 50 H | 50000 mH |
| 100 H | 100000 mH |
| 500 H | 500000 mH |
| 1000 H | 1.000000e+06 mH |
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How the formula works
Both henry and millihenry measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in henrys by 1000 to get millihenrys. To reverse the conversion, multiply a millihenry value by 0.001 to get back to henrys.
Frequently asked questions
What is Henry (H)?
The henry (H) is the SI unit of inductance, describing the voltage induced per unit rate of change of current.
What is Millihenry (mH)?
A Millihenry (mH) equals 1/1,000 henry(s), a scaled unit of inductance used for milli-scale electrical work.
How do I convert henrys to millihenrys?
Multiply the henry value by 1000 to get the equivalent in millihenrys. For example, 5 H × 1000 = 5000 mH.
Is this conversion exact?
Yes. Both units use fixed, defined scale factors, so the factor 1000 is an exact, non-rounded value.
Can I convert millihenrys back to henrys?
Yes. Divide the millihenry value by 1000, or multiply it by 0.001, to get henrys.
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About converting henrys to millihenrys
The henry (H) is the SI unit of inductance, describing the voltage induced per unit rate of change of current. A Millihenry (mH) equals 1/1,000 henry(s), a scaled unit of inductance used for milli-scale electrical work.
Use this calculator to move between henrys and millihenrys accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.