One microhenry is exactly 0.001 millihenries, so converting microhenries to millihenries 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.
The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in millihenries, so you can sanity-check whether your answer is a plausible size.
The formula
microhenries- The amount you are converting, in microhenries
0.001- The exact number of millihenries in one microhenry
millihenries- The converted result
How it works, step by step
- Enter the value in microhenries.
- It is multiplied by 0.001, the exact factor between the two units.
- The answer is shown in millihenries, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
PCB trace, 25 mm: 0.02 µH in millihenries
At 0.02 µH (pcb trace, 25 mm), the same quantity in millihenries is 0.02 × 0.001 = 2e-05 mH. One microhenry is 0.001 millihenries, so the numbers shrink as expected.
RF choke: 10 µH in millihenries
Take rf choke, roughly 10 µH. The conversion is a single multiplication — 10 × 0.001 — giving 0.01 mH. Because the relationship is proportional, doubling the input doubles the answer to 0.02 mH.
How to read your score
Frequently asked questions
How many millihenries are in one microhenry?
Exactly 0.001. 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 microhenries to millihenries?
millihenries = microhenries × 0.001. Reversed, microhenries = millihenries ÷ 0.001, which is the same as multiplying by 1000.
Which is the bigger unit, the microhenry or the millihenry?
The millihenry. One microhenry is only 0.001 of a millihenry, so it takes 1000 microhenries to make one millihenry.
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 microhenry?
Microhenries are the range of RF chokes, switching-converter inductors and PCB trace inductance.
What is a millihenry?
Millihenries cover audio crossovers, relay coils and the smoothing chokes in linear supplies.
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.
Microhenries to millihenries reference tables
| Microhenries | Millihenries |
|---|---|
| 0.5 µH | 0.0005 mH |
| 1 µH | 0.001 mH |
| 2 µH | 0.002 mH |
| 3 µH | 0.003 mH |
| 5 µH | 0.005 mH |
| 10 µH | 0.01 mH |
| 20 µH | 0.02 mH |
| 25 µH | 0.025 mH |
| 50 µH | 0.05 mH |
| 75 µH | 0.075 mH |
| 100 µH | 0.1 mH |
| 250 µH | 0.25 mH |
| 500 µH | 0.5 mH |
| 1000 µH | 1 mH |
| 5000 µH | 5 mH |
Exact factor: 1 microhenry = 0.001 millihenries.
| Quantity | µH | mH |
|---|---|---|
| PCB trace, 25 mm | 0.02 µH | 2e-05 mH |
| RF choke | 10 µH | 0.01 mH |
| Buck converter inductor | 47 µH | 0.047 mH |
| Speaker crossover coil | 1500 µH | 1.5 mH |
| Relay coil | 1e+05 µH | 100 mH |
| Mains transformer primary | 5e+06 µH | 5000 mH |
Published reference values, converted with the same factor this page uses.