Henries to Millihenries Converter
Enter the inductance in henries below to convert it to millihenries.
Convert Henries to Millihenries
Enter a value in henries (H) to convert to millihenries (mH).
Henry to Millihenry Conversion Table
Table showing various henry measurements converted to millihenries. Click any preset value or arrow to load it into the converter.
How to Convert Henries to Millihenries
To convert henries to millihenries, multiply the inductance by the following conversion ratio: 1,000 millihenries/henry.
Since one henry is equal to 1,000 millihenries, you can use this simple formula to convert:
The inductance in millihenries is equal to the inductance in henries multiplied by 1,000.
For example, here's how to convert 0.5 henries to millihenries using the formula above.
How Many Millihenries Are in a Henry?
There are 1,000 millihenries in a henry, which is why we use this value in the formula above.
Our henry to millihenry calculator automatically converts your inductance measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Henries and millihenries are both units used to measure inductance. Keep reading to learn more about each unit.
What Is a Henry?
SI unit of electrical inductance. It serves as a primary reference unit for measuring inductance across scientific and practical applications. [1]
The henry is classified as an International System of Units (SI) unit of inductance. Henries can be abbreviated as H; for example, 1 henry can be written as 1 H.
As the primary coherent reference unit for inductance in this category, all other inductance units are mathematically anchored to the henry (H).
In practice, henries (H) are widely used across standard inductance applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
What Is a Millihenry?
A millihenry is a unit of inductance equal to 1/1,000 of a henry (0.001 H). One-thousandth of a Henry (0.001 H). [2]
The millihenry is classified as a metric and SI-compatible unit of inductance. Millihenries can be abbreviated as mH; for example, 1 millihenry can be written as 1 mH.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millihenry (mH) a convenient decimal multiple of the henry (H).
In practice, millihenries (mH) are widely used across fine-tolerance laboratory, analytical, and micro-scale inductance measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting inductance between henries (H) and millihenries (mH), keep full floating-point precision (1 H = 1,000 mH; 1 mH = 0.001 H) during intermediate calculations and round only the final millihenry figure to match your instrument tolerance.
More Henry & Millihenry Conversions
Need to calculate in the opposite direction? Use our millihenries to henries converter (mH to H) to switch your starting unit immediately. You can also explore related tools such as converting microhenries to millihenries, or converting microhenries to henries.
Convert from Henries
Convert to Millihenries
Frequently Asked Questions
References
- [1]NIST CUU StandardNIST CUU (Derived SI Unit: Henry (H))·Inductance Metrology Standard — Henries (H) to Millihenries (mH)
- [2]BIPM SpecificationBIPM (SI Brochure (9th Ed.) — Inductance)·Unit Specifications: Henry (H) & Millihenry (mH)
- [3]BIPM Prefixes ReferenceBIPM Prefixes (SI Submultiples (mH, µH, nH))·Conversion Factors & Mathematical Basis (H to mH)