About this converter
Inductance measures how strongly a conductor or coil opposes changes in electric current by storing energy in a magnetic field. Henry (H) is the SI unit, 1 millihenry equals 0.001 H, 1 microhenry equals 0.000001 H, and 1 Wb/A equals exactly 1 H.
This converter supports SI prefix units from exahenry to attohenry plus CGS and electrostatic inductance units. RF engineers, power electronics designers, audio circuit builders, transformer designers, and physics students use these conversions for coils, chokes, filters, and electromagnetic references.
How to Use This Converter
- Enter the inductance value.
- Select the source unit from the From menu.
- Select the target unit from the To menu.
- Read the converted result and formula line.
- Use Swap to reverse the selected units.
Units Covered
| Unit | Symbol | Common Use |
|---|---|---|
| Henry | H | SI inductance, circuit equations, and component specifications. |
| Exahenry | EH | Extremely large scientific scale conversions. |
| Petahenry | PH | Very large theoretical inductance values. |
| Terahenry | TH | Scientific notation and large-scale references. |
| Gigahenry | GH | Large inductance scale checks. |
| Megahenry | MH | Large engineering or theoretical inductance values. |
| Kilohenry | kH | Large coils and scale conversions. |
| Hectohenry | hH | SI prefix conversion practice. |
| Dekahenry | daH | Intermediate SI prefix calculations. |
| Decihenry | dH | Decimal-scale inductance conversions. |
| Centihenry | cH | Small SI prefix conversion values. |
| Millihenry | mH | Audio chokes, filters, and power electronics inductors. |
| Microhenry | µH | RF coils, switching regulators, and small inductors. |
| Nanohenry | nH | RF traces, parasitic inductance, and high-speed circuits. |
| Picohenry | pH | Very small parasitic inductance and microwave design. |
| Femtohenry | fH | Scientific and ultra-small scale references. |
| Attohenry | aH | Extremely small theoretical inductance values. |
| Abhenry | abH | CGS electromagnetic inductance references. |
| Stathenry | statH | CGS electrostatic inductance references. |
| Weber per ampere | Wb/A | Magnetic flux linkage per current. |
| EMU of inductance | EMU | Electromagnetic unit system references. |
| ESU of inductance | ESU | Electrostatic unit system references. |
Henries to Millihenries Conversion Table
| From | To |
|---|---|
| 0.000001 H | 0.001 mH |
| 0.00001 H | 0.01 mH |
| 0.0001 H | 0.1 mH |
| 0.001 H | 1 mH |
| 0.005 H | 5 mH |
| 0.01 H | 10 mH |
| 0.05 H | 50 mH |
| 0.1 H | 100 mH |
| 0.5 H | 500 mH |
| 1 H | 1,000 mH |
How to Convert Henries to Millihenries
Henries to millihenries
For example, 0.047 H x 1,000 = 47 mH.
Millihenries to henries
For example, 220 mH / 1,000 = 0.22 H.
When You Need to Convert Inductance
Component datasheets often list inductors in µH or mH, while equations use henries. A 4.7 mH choke equals 0.0047 H, which is the value needed in time-constant and reactance formulas.
RF layout work may involve nanohenries of parasitic inductance. A 12 nH trace inductance equals 0.012 µH, small enough to matter in high-frequency matching networks.
Older electromagnetic references can use abhenry or stathenry. Since 1 abH equals 1e-9 H, converting those units first prevents large scale errors in historical or theoretical calculations.