How many millihenries are in one henry?

One henry (1 H) equals exactly 1,000 millihenries (1,000 mH). The prefix "milli" means 10⁻³, so 1 H = 10³ mH.

Why are most inductors rated in millihenries or microhenries rather than henries?

The henry is a relatively large unit for practical electronics. Most RF coils and signal-path inductors range from a few nanohenries to a few millihenries. Large power-supply chokes can reach tens or hundreds of millihenries, but values in full henries are rare outside of power transformers and motor windings.

What is the difference between µH and uH?

They represent the same unit. "µH" uses the Greek letter mu (µ) for "micro", while "uH" is the ASCII-safe substitute seen in software tools, datasheets, and schematics that cannot render the µ character.

Can I enter decimal values like 0.5 mH?

Yes. You can enter any positive number, including decimals such as 0.5 mH (= 0.0005 H) or 0.001 mH (= 1 µH). The converter handles them correctly.

How many microhenries are in one millihenry?

One millihenry equals exactly 1,000 microhenries (1,000 µH). Microhenries are three orders of magnitude smaller than millihenries.

Is this converter accurate for engineering calculations?

Yes. The conversion is a precise mathematical division with no approximation. Results are displayed with up to 6 significant figures to avoid floating-point display noise.

Millihenries to Henries Converter

Name: Millihenries to Henries Converter
Availability: InStock
Author: Nham Vu

Enter an inductance value in millihenries and instantly see the equivalent in henries plus all major inductance units.

Enter Value in Millihenries (mH)

Inductance (mH)

Common Values

Conversion Results

Enter a value on the left to see conversions.

Inductance Unit Reference

Unit	Symbol	Value in Henries	Equivalence
Henry	H	1	Base unit
Millihenry	mH	10⁻³	1,000 mH = 1 H
Microhenry	µH	10⁻⁶	1,000,000 µH = 1 H
Nanohenry	nH	10⁻⁹	1 nH = 0.001 µH

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Summary

Enter an inductance value in millihenries and instantly see the equivalent in henries plus all major inductance units.

How it works

Enter an inductance value in the millihenries (mH) input field.
The converter divides by 1,000 to produce henries (H).
Results for µH and nH are computed simultaneously.
Click the copy icon next to any result to copy it to your clipboard.
Use the Clear button to reset and start a new conversion.

Use cases

Converting inductor ratings from millihenries to henries for circuit simulation.
Cross-checking inductance specifications in component datasheets.
Translating SPICE netlist parameters between mH and H.
Verifying filter inductance values when comparing components with different unit labels.
Teaching students the relationship between the henry base unit and practical sub-units.
Converting energy storage calculations that use millihenries back to SI base units.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu