To convert millihenries to nanohenries, multiply by 1,000,000. That factor is the whole relationship: both units measure how strongly a coil opposes a change in current, so the conversion is a proportion with no offset and no substance-specific constant.
Millihenries cover audio crossovers, relay coils and the smoothing chokes in linear supplies. One nano henry is one billionth of a henry (1e-9 henries).
Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into nanohenries, which is usually more useful than the bare number.
The formula
millihenries- The amount you are converting, in millihenries
1,000,000- The exact number of nanohenries in one millihenry
nanohenries- The converted result
How it works, step by step
- Enter the value in millihenries.
- It is multiplied by 1,000,000, the exact factor between the two units.
- The answer is shown in nanohenries, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
RF choke: 0.01 mH in nanohenries
RF choke comes to about 0.01 mH. Multiplying by the factor: 0.01 × 1e+06 = 10,000 nH. Dividing the answer back by 1e+06 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
Mains transformer primary: 5000 mH in nanohenries
Take mains transformer primary, roughly 5000 mH. The conversion is a single multiplication — 5000 × 1e+06 — giving 5e+09 nH. Because the relationship is proportional, doubling the input doubles the answer to 1e+10 nH.
How to read your score
Frequently asked questions
How many nanohenries are in one millihenry?
Exactly 1,000,000. 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 nanohenries?
nanohenries = millihenries × 1,000,000. Reversed, millihenries = nanohenries ÷ 1,000,000, which is the same as multiplying by 1e-06.
Which is the bigger unit, the millihenry or the nanohenry?
The millihenry. One millihenry equals 1e+06 nanohenries.
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 nanohenry?
One nano henry is one billionth of a henry (1e-9 henries).
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 nanohenries reference tables
| Millihenries | Nanohenries |
|---|---|
| 0.5 mH | 500,000 nH |
| 1 mH | 1e+06 nH |
| 2 mH | 2e+06 nH |
| 3 mH | 3e+06 nH |
| 5 mH | 5e+06 nH |
| 10 mH | 1e+07 nH |
| 20 mH | 2e+07 nH |
| 25 mH | 2.5e+07 nH |
| 50 mH | 5e+07 nH |
| 75 mH | 7.5e+07 nH |
| 100 mH | 1e+08 nH |
| 250 mH | 2.5e+08 nH |
| 500 mH | 5e+08 nH |
| 1000 mH | 1e+09 nH |
| 5000 mH | 5e+09 nH |
Exact factor: 1 millihenry = 1,000,000 nanohenries.
| Quantity | mH | nH |
|---|---|---|
| PCB trace, 25 mm | 2e-05 mH | 20 nH |
| RF choke | 0.01 mH | 1e+04 nH |
| Buck converter inductor | 0.047 mH | 4.7e+04 nH |
| Speaker crossover coil | 1.5 mH | 1.5e+06 nH |
| Relay coil | 100 mH | 1e+08 nH |
| Mains transformer primary | 5000 mH | 5e+09 nH |
Published reference values, converted with the same factor this page uses.