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Convert henrys to millihenrys instantly. Essential for inductor selection, filter design, and power electronics applications.
mH = H × 1000
H = mH ÷ 1000
| Henrys (H) | Millihenrys (mH) |
|---|---|
| 0.000001 | 0.001 |
| 0.000010 | 0.01 |
| 0.000100 | 0.1 |
| 0.001000 | 1 |
| 0.010000 | 10 |
| 0.100000 | 100 |
| 0.220000 | 220 |
| 0.470000 | 470 |
| 1.000000 | 1000 |
| 2.200000 | 2200 |
| 4.700000 | 4700 |
| 10.000000 | 10000 |
The henry (H) is the SI unit of electrical inductance, named after American scientist Joseph Henry who discovered electromagnetic induction independently of Michael Faraday. One henry is defined as the inductance that produces one volt of electromotive force when the current changes at a rate of one ampere per second. A henry is a relatively large unit, so inductors are commonly rated in millihenrys or microhenrys for practical applications.
A millihenry (mH) is one-thousandth of a henry. The prefix "milli" indicates a factor of 0.001 in the metric system. Millihenrys are commonly used to rate inductors in power supplies, audio circuits, radio frequency applications, and electromagnetic interference (EMI) filters. Most practical inductors used in electronics range from microhenrys to several henrys, with millihenrys being a convenient middle ground for many common applications.
Converting henrys to millihenrys is straightforward:
Example: 0.47 H × 1,000 = 470 mH
There are 1,000 millihenrys in one henry. The prefix "milli" means one-thousandth, so to convert from henrys to millihenrys, multiply by 1,000. This conversion is exact and applies universally in electrical measurements.
100 millihenrys equals 0.1 henrys (or 1/10th of a henry). To convert, divide 100 by 1,000. A 100 mH inductor is common in switching power supplies for output filtering and current smoothing applications.
Millihenrys provide more convenient numbers for typical inductor values. Writing "47 mH" is clearer than "0.047 H". Most inductors used in electronics have values between microhenrys and several henrys, making millihenrys a practical unit for everyday applications.
Inductance is measured using an LCR meter or inductance meter. Set the meter to the mH range and connect the inductor to the test leads. The meter applies an AC signal and measures the resulting impedance to calculate inductance. For accurate measurements, use the frequency specified in the inductor's datasheet.
Inductance depends on the number of turns, core material, core geometry, and air gap (if present). Ferrite and iron-powder cores increase inductance compared to air-core designs. Current level can affect inductance in cores with saturation characteristics. Temperature and frequency also influence measured inductance values.
It depends on the application. Small RF inductors are typically rated in microhenrys (µH), ranging from 0.1 µH to several hundred µH. Larger power inductors are rated in millihenrys, from 0.1 mH up to several henrys. The manufacturer chooses the unit that gives the most convenient numerical value for the typical inductance range.