One millihenry is exactly 1000 microhenries, so converting millihenries to microhenries is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
Millihenries cover audio crossovers, relay coils and the smoothing chokes in linear supplies. Microhenries are the range of RF chokes, switching-converter inductors and PCB trace inductance.
Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into microhenries, which is usually more useful than the bare number.
The formula
millihenries- The amount you are converting, in millihenries
1000- The exact number of microhenries in one millihenry
microhenries- The converted result
How it works, step by step
- Enter the value in millihenries.
- It is multiplied by 1000, the exact factor between the two units.
- The answer is shown in microhenries, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Mains transformer primary: 5000 mH in microhenries
Take mains transformer primary, roughly 5000 mH. The conversion is a single multiplication — 5000 × 1000 — giving 5e+06 µH. Because the relationship is proportional, doubling the input doubles the answer to 1e+07 µH.
Speaker crossover coil: 1.5 mH in microhenries
Take speaker crossover coil, roughly 1.5 mH. The conversion is a single multiplication — 1.5 × 1000 — giving 1500 µH. Because the relationship is proportional, doubling the input doubles the answer to 3000 µH.
How to read your score
Frequently asked questions
How many microhenries are in one millihenry?
Exactly 1000. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert millihenries to microhenries?
microhenries = millihenries × 1000. Reversed, millihenries = microhenries ÷ 1000, which is the same as multiplying by 0.001.
Which is the bigger unit, the millihenry or the microhenry?
The millihenry. One millihenry equals 1000 microhenries.
What does this quantity actually measure?
Both units measure how strongly a coil opposes a change in current. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a millihenry?
Millihenries cover audio crossovers, relay coils and the smoothing chokes in linear supplies.
What is a microhenry?
Microhenries are the range of RF chokes, switching-converter inductors and PCB trace inductance.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Millihenries to microhenries reference tables
| Millihenries | Microhenries |
|---|---|
| 0.5 mH | 500 µH |
| 1 mH | 1000 µH |
| 2 mH | 2000 µH |
| 3 mH | 3000 µH |
| 5 mH | 5000 µH |
| 10 mH | 10,000 µH |
| 20 mH | 20,000 µH |
| 25 mH | 25,000 µH |
| 50 mH | 50,000 µH |
| 75 mH | 75,000 µH |
| 100 mH | 100,000 µH |
| 250 mH | 250,000 µH |
| 500 mH | 500,000 µH |
| 1000 mH | 1e+06 µH |
| 5000 mH | 5e+06 µH |
Exact factor: 1 millihenry = 1000 microhenries.
| Quantity | mH | µH |
|---|---|---|
| PCB trace, 25 mm | 2e-05 mH | 0.02 µH |
| RF choke | 0.01 mH | 10 µH |
| Buck converter inductor | 0.047 mH | 47 µH |
| Speaker crossover coil | 1.5 mH | 1500 µH |
| Relay coil | 100 mH | 1e+05 µH |
| Mains transformer primary | 5000 mH | 5e+06 µH |
Published reference values, converted with the same factor this page uses.