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Inductance Converter: Convert H, mH, µH, nH and More

Inductance is an important electrical property used in coils, inductors, transformers, filters, power supplies, and radio frequency circuits. Because practical inductance values are often much smaller than one henry, engineers and students commonly work with millihenries, microhenries, and nanohenries. The Inductance Converter from CalculatorKits makes it easy to convert between these units without manually calculating powers of ten.

The CalculatorKits Inductance Converter supports henry (H), millihenry (mH), microhenry (µH), and nanohenry (nH). For example, 1 H equals 1,000 mH, 1,000,000 µH, and 1,000,000,000 nH. The tool uses SI prefix scaling and provides the converted result instantly in your browser.

Open the Inductance Converter

What Is Inductance?

Inductance is a property of an electrical circuit or component that describes its opposition to changes in electric current. An inductor stores energy in a magnetic field when current flows through it.

The symbol for inductance is L, and its SI unit is the henry (H).

The basic voltage and current relationship for an inductor is:

V = L × (dI/dt)

Where:

V = voltage across the inductor
L = inductance in henries
dI/dt = rate of change of current

This relationship shows why an inductor reacts when current changes. A larger inductance produces a larger voltage for the same rate of change of current.

The henry is an SI derived unit. NIST defines inductance in henries and expresses the unit as weber per ampere.

What Does the Inductance Converter Do?

The CalculatorKits Inductance Converter changes an inductance value from one supported unit to another.

The tool currently supports:

Unit	Symbol	Equivalent in henries	Common application
Henry	H	1 H	Larger inductors and general calculations
Millihenry	mH	0.001 H	Filters, chokes, audio circuits
Microhenry	µH	0.000001 H	Power electronics and coils
Nanohenry	nH	0.000000001 H	RF and high frequency circuits

These four units cover many of the values encountered in practical electronics and electrical engineering. The CalculatorKits page specifically lists H, mH, µH, and nH as its supported inductance units.

How to Use the Inductance Converter

Using the calculator is straightforward.

1. Enter the inductance value into the input field.
2. Select the original unit, such as H, mH, µH, or nH.
3. Select the unit you want to convert to.
4. Read the converted value shown by the calculator.
5. Change the input value or units whenever another conversion is needed.

For example, suppose an inductor has a value of 10 mH and you want to express it in microhenries.

Enter:

Input = 10

Choose:

From = mH

Choose:

To = µH

The result is:

10 mH = 10,000 µH

The calculator performs the conversion automatically, so there is no need to count zeros manually.

Inductance Conversion Formula

Inductance units use SI prefixes. The CalculatorKits converter applies the general conversion relationship:

Result = Input × (From Factor / To Factor)

For example, converting henries to millihenries:

mH = H × 1,000

Therefore:

1 H = 1,000 mH

For microhenries:

µH = H × 1,000,000

Therefore:

1 H = 1,000,000 µH

For nanohenries:

nH = H × 1,000,000,000

Therefore:

1 H = 1,000,000,000 nH

NIST explains that SI prefixes provide decimal scaling factors for units, making them useful when expressing quantities much larger or smaller than the coherent SI unit.

Inductance Conversion Table

The following table shows the most useful relationships between the units supported by the calculator.

Inductance	Equivalent value
1 H	1 H
1 H	1,000 mH
1 H	1,000,000 µH
1 H	1,000,000,000 nH
1 mH	0.001 H
1 mH	1,000 µH
1 mH	1,000,000 nH
1 µH	0.000001 H
1 µH	0.001 mH
1 µH	1,000 nH
1 nH	0.000000001 H
1 nH	0.000001 mH
1 nH	0.001 µH

The relationships are exact decimal SI conversions.

Henry to Millihenry

Converting H to mH is one of the most common inductance conversions.

The relationship is:

1 H = 1,000 mH

To convert from henries to millihenries, multiply by 1,000.

For example:

5 H × 1,000 = 5,000 mH

Therefore:

5 H = 5,000 mH

To convert in the opposite direction, divide by 1,000.

For example:

750 mH ÷ 1,000 = 0.75 H

Therefore:

750 mH = 0.75 H

The CalculatorKits tool uses H to mH as one of its primary conversion presets.

Henry to Microhenry

A microhenry is one millionth of a henry.

Therefore:

1 H = 1,000,000 µH

For example:

0.25 H × 1,000,000 = 250,000 µH

So:

0.25 H = 250,000 µH

For the reverse conversion:

50,000 µH ÷ 1,000,000 = 0.05 H

Therefore:

50,000 µH = 0.05 H

This conversion is useful when working with inductors whose values are specified in microhenries rather than henries.

Henry to Nanohenry

Nanohenries are commonly used for very small inductances, particularly in high frequency and RF applications.

The relationship is:

1 H = 1,000,000,000 nH

For example:

0.000001 H = 1,000 nH

Therefore:

0.000001 H = 1 µH = 1,000 nH

Another example:

0.00000001 H = 10 nH

Because nanohenry values involve very small numbers when expressed in henries, using a dedicated converter can help prevent decimal placement mistakes.

Millihenry to Microhenry

The relationship between millihenries and microhenries is:

1 mH = 1,000 µH

Therefore:

5 mH = 5,000 µH

And:

0.5 mH = 500 µH

For the reverse:

2,000 µH = 2 mH

This is a particularly useful conversion when comparing inductor specifications that use different unit conventions.

Microhenry to Nanohenry

The relationship is:

1 µH = 1,000 nH

For example:

10 µH = 10,000 nH

Another example:

0.5 µH = 500 nH

For the reverse:

2,500 nH = 2.5 µH

This conversion is especially useful when moving between conventional electronics values and small RF component values.

Common Inductance Conversion Examples

Here are several practical examples that can be checked using the CalculatorKits Inductance Converter.

Example 1: Convert 10 H to mH

Use:

mH = H × 1,000

10 × 1,000 = 10,000 mH

Result:

10 H = 10,000 mH

Example 2: Convert 5 µH to H

Since:

1 µH = 0.000001 H

Then:

5 µH = 0.000005 H

Result:

5 µH = 0.000005 H

Example 3: Convert 2 nH to µH

Since:

1 nH = 0.001 µH

Then:

2 × 0.001 = 0.002 µH

Result:

2 nH = 0.002 µH

Example 4: Convert 100 mH to H

100 × 0.001 = 0.1 H

Therefore:

100 mH = 0.1 H

Example 5: Convert 50 µH to mH

50 ÷ 1,000 = 0.05 mH

Therefore:

50 µH = 0.05 mH

Example 6: Convert 10 nH to H

10 × 0.000000001 = 0.00000001 H

Therefore:

10 nH = 0.00000001 H

Real World Inductance Examples

Inductance values vary widely depending on the application.

Component or application	Example inductance	Equivalent
Power inductor	100 µH	0.0001 H
RF coil	10 nH	0.00000001 H
Transformer	1 H	1,000 mH
Choke coil	10 mH	0.01 H
Audio inductor	1 mH	1,000 µH
Larger inductor	0.5 H	500,000 µH

These examples illustrate why multiple units are needed. A single unit would make some practical values inconvenient to write.

For instance, describing an RF coil as 0.00000001 H is possible, but 10 nH is much easier to read.

Inductance and Stored Magnetic Energy

An inductor stores energy in its magnetic field. The stored energy can be calculated using:

E = 1/2 LI²

Where:

E = stored energy in joules
L = inductance in henries
I = current in amperes

Suppose an inductor has:

L = 100 µH

and carries:

I = 2 A

First convert the inductance:

100 µH = 0.0001 H

Then:

E = 1/2 × 0.0001 × 2²

E = 0.0002 J

So the magnetic energy stored is:

0.0002 joule

This illustrates why correct unit conversion matters when inductance is used in a larger electrical calculation.

Inductance and Rate of Current Change

The equation:

V = L × (dI/dt)

shows the relationship between inductance, voltage, and changing current.

Suppose:

L = 0.01 H

and the current changes at:

100 A/s

Then:

V = 0.01 × 100

V = 1 V

The inductor develops a voltage of 1 volt under these conditions.

If the inductance is given in mH or µH, it should first be converted to henries before using the equation unless the calculation has been rearranged to work directly with another unit.

What Determines the Inductance of a Coil?

For a simple coil or solenoid, inductance depends on several physical factors.

A commonly used relationship is:

L = (µ × N² × A) / l

Where:

L = inductance
µ = magnetic permeability
N = number of turns
A = cross sectional area
l = length of the magnetic path or coil

This relationship shows several important trends.

Increasing the number of turns generally increases inductance because the number of turns is squared.

Increasing the cross sectional area can also increase inductance.

The magnetic material affects inductance through its permeability.

The geometry and magnetic path length also influence the final value.

Real inductors can be more complicated because core losses, winding resistance, frequency, saturation, parasitic capacitance, and construction details can affect their behavior.

Inductance in Electrical and Electronic Circuits

Inductors appear in many types of circuits.

Power supplies

Inductors are used for energy storage and filtering in switching power supplies.

Filters

Inductors can work with capacitors and resistors to create frequency selective circuits.

Transformers

Mutual inductance between windings allows electrical energy to be transferred between circuits.

RF circuits

Very small inductances measured in nH or µH are common in high frequency applications.

Audio circuits

Inductors can be used in crossover networks and filtering applications.

Chokes

Choke inductors can help reduce unwanted AC components or high frequency noise.

Understanding the correct inductance unit is important when selecting components because an error of a factor of 1,000 can completely change circuit behavior.

Inductance vs Capacitance

Inductance and capacitance are both important energy storage properties, but they store energy differently.

Property	Inductance	Capacitance
Symbol	L	C
SI unit	Henry	Farad
Energy stored in	Magnetic field	Electric field
Common components	Inductor, coil	Capacitor
Basic voltage relationship	V = L(dI/dt)	Q = CV
Typical small units	µH, nH	µF, nF, pF

Inductors and capacitors are frequently used together in filters, resonant circuits, oscillators, and power electronics.

Inductance vs Resistance

Resistance opposes current flow, while inductance opposes changes in current.

Resistance is measured in ohms:

R = V/I

Inductance is measured in henries and relates voltage to the rate of change of current:

V = L(dI/dt)

A real inductor also has winding resistance, so practical components can have both inductive and resistive characteristics.

For circuit analysis, it is therefore useful to distinguish the inductance value from the resistance of the winding.

Common Mistakes When Converting Inductance

Confusing mH and µH

Remember:

1 mH = 1,000 µH

A mistake between these units creates a factor of 1,000 error.

Confusing µH and nH

The relationship is:

1 µH = 1,000 nH

So 10 µH is 10,000 nH, not 10 nH.

Moving the decimal in the wrong direction

When converting from a larger unit to a smaller unit, the numerical value increases.

For example:

1 H = 1,000 mH

When converting from a smaller unit to a larger unit, the numerical value decreases.

For example:

1,000 mH = 1 H

Confusing inductance with magnetic permeability

Inductance is a property of a circuit or component, while permeability describes how a material responds to a magnetic field. They are related in coil design but are not the same quantity.

Confusing inductance with reactance

Inductance is measured in henries. Inductive reactance is measured in ohms and depends on both inductance and frequency:

XL = 2πfL

An inductor can have the same inductance but a different reactance at a different frequency.

Rounding too early

Very small inductance values can contain several decimal places when expressed in henries. It is better to complete the conversion first and round the final displayed value when necessary.

Why Use the CalculatorKits Inductance Converter?

The CalculatorKits tool is useful when you need a quick conversion between common inductance units.

It provides:

• Support for H, mH, µH, and nH
• Instant conversion results
• Common H to mH, H to µH, and H to nH presets
• SI based conversion factors
• Browser based calculations
• Mobile and desktop usability
• No registration requirement
• Local browser based calculations

The calculator states that it uses official SI conversion constants, does not round until final display, and supports high precision calculations. It also states that calculations are performed locally in the browser.

The page also provides recent conversion functionality locally in the browser, so the tool can make frequently used conversions easier to revisit.

Frequently Asked Questions

What is inductance?

Inductance is a property of an electrical circuit or component that describes its opposition to changes in current and its ability to store energy in a magnetic field.

What is the SI unit of inductance?

The SI unit of inductance is the henry, represented by H. NIST lists the henry as the SI derived unit of inductance and expresses it as weber per ampere.

What is the formula for inductance?

A basic inductor relationship is:

V = L × (dI/dt)

For a simple coil, a commonly used relationship is:

L = (µ × N² × A) / l

What is 1 H in mH?

1 H = 1,000 mH

What is 1 H in µH?

1 H = 1,000,000 µH

What is 1 H in nH?

1 H = 1,000,000,000 nH

What is 1 mH in µH?

1 mH = 1,000 µH

What is 1 µH in nH?

1 µH = 1,000 nH

What is the difference between mH, µH, and nH?

They are different scaled units of inductance.

1 mH = 1,000 µH

1 µH = 1,000 nH

Therefore:

1 mH = 1,000,000 nH

What is inductance used for?

Inductance is used in power supplies, filters, transformers, RF circuits, audio circuits, chokes, oscillators, and many other electrical and electronic applications.

Is the Inductance Converter accurate?

The CalculatorKits page states that the converter uses standard SI conversion factors and exact conversions for its supported units. NIST also provides the SI framework and conversion information used for inductance units.

Can I use the Inductance Converter on a mobile phone?

Yes. The CalculatorKits converter is browser based and is designed to work on desktop and mobile devices.

Does the converter require registration?

No. The CalculatorKits page states that the tool does not require an account or registration.

Does the converter store my conversion data?

The tool performs calculations locally in the browser. Its page also describes recent conversions as being saved locally in the browser rather than uploaded to a server.

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Conclusion

Inductance is a fundamental electrical property used wherever magnetic fields, coils, and changing currents are involved. Although the henry is the SI unit, practical inductors are commonly specified in millihenries, microhenries, and nanohenries.

The Inductance Converter makes these conversions much easier by applying the correct SI scaling factors automatically. Whether you need to convert 10 H to mH, 5 µH to H, 2 nH to µH, or compare values across several unit scales, the tool provides an instant result without requiring manual calculations.

The key relationships are simple to remember:

1 H = 1,000 mH

1 H = 1,000,000 µH

1 H = 1,000,000,000 nH

1 mH = 1,000 µH

1 µH = 1,000 nH

Knowing these relationships is useful, but a dedicated converter can make everyday component selection, circuit analysis, engineering calculations, and educational work faster and less prone to unit errors.

References

1. NIST Guide to the SI, Chapter 4: The Two Classes of SI Units and the SI Prefixes
2. NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically
3. NIST SI Brochure, Section 2: SI Derived Units
4. BIPM SI Brochure: The International System of Units

• Written and reviewed by the CalculatorKits Editorial Team
• Last Updated: September 12, 2026