To convert henries to nanohenries, multiply by 1,000,000,000. 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.
One nano henry is one billionth of a henry (1e-9 henries). The henry is the SI unit of inductance: one volt induced per amp-per-second change in current.
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
henries- The amount you are converting, in henries
1,000,000,000- The exact number of nanohenries in one henry
nanohenries- The converted result
How it works, step by step
- Enter the value in henries.
- It is multiplied by 1,000,000,000, 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
Relay coil: 0.1 H in nanohenries
Relay coil comes to about 0.1 H. Multiplying by the factor: 0.1 × 1e+09 = 1e+08 nH. Dividing the answer back by 1e+09 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
Mains transformer primary: 5 H in nanohenries
Mains transformer primary comes to about 5 H. Multiplying by the factor: 5 × 1e+09 = 5e+09 nH. Dividing the answer back by 1e+09 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many nanohenries are in one henry?
Exactly 1,000,000,000. 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 henries to nanohenries?
nanohenries = henries × 1,000,000,000. Reversed, henries = nanohenries ÷ 1,000,000,000, which is the same as multiplying by 1e-09.
Which is the bigger unit, the henry or the nanohenry?
The henry. One henry equals 1e+09 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 henry?
The henry is the SI unit of inductance: one volt induced per amp-per-second change in current.
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.
Henries to nanohenries reference tables
| Henries | Nanohenries |
|---|---|
| 0.5 H | 5e+08 nH |
| 1 H | 1e+09 nH |
| 2 H | 2e+09 nH |
| 3 H | 3e+09 nH |
| 5 H | 5e+09 nH |
| 10 H | 1e+10 nH |
| 20 H | 2e+10 nH |
| 25 H | 2.5e+10 nH |
| 50 H | 5e+10 nH |
| 75 H | 7.5e+10 nH |
| 100 H | 1e+11 nH |
| 250 H | 2.5e+11 nH |
| 500 H | 5e+11 nH |
| 1000 H | 1e+12 nH |
| 5000 H | 5e+12 nH |
Exact factor: 1 henry = 1,000,000,000 nanohenries.
| Quantity | H | nH |
|---|---|---|
| PCB trace, 25 mm | 2e-08 H | 20 nH |
| RF choke | 1e-05 H | 1e+04 nH |
| Buck converter inductor | 4.7e-05 H | 4.7e+04 nH |
| Speaker crossover coil | 0.0015 H | 1.5e+06 nH |
| Relay coil | 0.1 H | 1e+08 nH |
| Mains transformer primary | 5 H | 5e+09 nH |
Published reference values, converted with the same factor this page uses.