Henries to Millihenries Conversion (H to mH)

Henries to Millihenries Converter

Enter the electrical inductance in henries below to convert it to millihenries.

Result in Millihenries:

1 H = 1,000 mH

How to Convert Henries to Millihenries

To convert a measurement in henries to a measurement in millihenries, multiply the electrical 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:

millihenries = henries × 1,000

The electrical inductance in millihenries is equal to the electrical inductance in henries multiplied by 1,000.

For example, here's how to convert 5 henries to millihenries using the formula above.

millihenries = (5 H × 1,000) = 5,000 mH

conversion scale showing henries and equivalent millihenries electrical inductance values

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.

1 H = 1,000 mH

Henries and millihenries are both units used to measure electrical inductance. Keep reading to learn more about each unit of measure.

What Is a Henry?

One henry is equal to the inductance of a conductor in which there is one volt of electromotive force when the current through the conductor is increased by one ampere per second.^[1]

The henry is the SI derived unit for electrical inductance in the metric system. Henries can be abbreviated as H; for example, 1 henry can be written as 1 H.

The National Institute of Standards and Technology recommends using "henries" as the plural form of the unit, however the usage of "henrys" is also common.^[2]

Learn more about henries.

What Is a Millihenry?

One millihenry is equal to 1/1,000 of a henry, which is the inductance of a conductor with one volt of electromotive force when the current is increased by one ampere per second.

The millihenry is a multiple of the henry, which is the SI derived unit for electrical inductance. In the metric system, "milli" is the prefix for thousandths, or 10^-3. Millihenries can be abbreviated as mH; for example, 1 millihenry can be written as 1 mH.

Learn more about millihenries.

Henry to Millihenry Conversion Table

Table showing various henry measurements converted to millihenries.
Henries	Millihenries
0.001 H	1 mH
0.002 H	2 mH
0.003 H	3 mH
0.004 H	4 mH
0.005 H	5 mH
0.006 H	6 mH
0.007 H	7 mH
0.008 H	8 mH
0.009 H	9 mH
0.01 H	10 mH
0.02 H	20 mH
0.03 H	30 mH
0.04 H	40 mH
0.05 H	50 mH
0.06 H	60 mH
0.07 H	70 mH
0.08 H	80 mH
0.09 H	90 mH
0.1 H	100 mH
0.2 H	200 mH
0.3 H	300 mH
0.4 H	400 mH
0.5 H	500 mH
0.6 H	600 mH
0.7 H	700 mH
0.8 H	800 mH
0.9 H	900 mH
1 H	1,000 mH

Table showing various henry measurements converted to millihenries.

Henries

Millihenries

0.001 H

1 mH

0.002 H

2 mH

0.003 H

3 mH

0.004 H

4 mH

0.005 H

5 mH

0.006 H

6 mH

0.007 H

7 mH

0.008 H

8 mH

0.009 H

9 mH

0.01 H

10 mH

0.02 H

20 mH

0.03 H

30 mH

0.04 H

40 mH

0.05 H

50 mH

0.06 H

60 mH

0.07 H

70 mH

0.08 H

80 mH

0.09 H

90 mH

0.1 H

100 mH

0.2 H

200 mH

0.3 H

300 mH

0.4 H

400 mH

0.5 H

500 mH

0.6 H

600 mH

0.7 H

700 mH

0.8 H

800 mH

0.9 H

900 mH

1 H

1,000 mH

References

International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf
Ambler Thompson and Barry N. Taylor, Guide for the Use of the International System of Units (SI), National Institute of Standards and Technology, https://physics.nist.gov/cuu/pdf/sp811.pdf