Convert Inductance Units — H, mH, µH & nH Convert between henries, millihenries, microhenries, and nanohenries.

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Inductance Converter

Convert between henries, millihenries, microhenries, and nanohenries.

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What Is Inductance Converter?

An inductance converter translates between different scales of the henry, the SI unit of electrical inductance. One henry is the inductance that produces one volt of EMF when the current changes at one ampere per second. Like the farad, one henry is a large value — most inductors range from nanohenries (nH, for RF circuits and PCB traces) through microhenries (µH, for power supplies and filters) to millihenries (mH, for audio crossovers and motor controls). Henries are encountered in large transformers and high-energy inductors.

Why Use Inductance Converter?

Covers nH to H — the full practical inductance range.
Essential for RF engineering and power supply design.
Real-time conversion for component selection.
Quick reference table.

Common Use Cases

RF Engineering

Convert between nH and µH for antenna matching and filter design.

Power Supply Design

Size output inductors in µH and mH for switching regulators.

Audio

Design crossover networks with mH inductors.

EMC/EMI

Specify ferrite bead inductance for electromagnetic compatibility.

Technical Guide

The henry (H) is defined by Faraday's law.

• 1 H = 1,000 mH
• 1 mH = 1,000 µH
• 1 µH = 1,000 nH

So: 1 H = 10³ mH = 10⁶ µH = 10⁹ nH

Common inductance values:
• PCB trace: 1-10 nH
• Ferrite bead: 10-1,000 nH
• RF inductor: 1-100 nH
• Power inductor (buck converter): 1-100 µH
• Audio crossover: 0.1-10 mH
• Power transformer (primary): 1-100 H

Inductance depends on geometry: L = µ₀µᵣN²A/l, where N is turns, A is cross-sectional area, l is magnetic path length, and µᵣ is relative permeability of the core material.

Tips & Best Practices

1
1 mH = 1,000 µH = 1,000,000 nH. Simple factors of 1,000.
2
Switching power supply inductors are typically 1-100 µH.
3
RF inductors are typically nH range — even PCB traces have inductance.
4
Inductance increases with the square of the number of turns (L ∝ N²).

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Frequently Asked Questions

Q How many microhenries in a millihenry?

Exactly 1,000 microhenries (µH) equal one millihenry (mH).

Q What inductance does a typical power supply use?

Buck converter output inductors are typically 1-100 µH, depending on the switching frequency and current rating.

Q What is the inductance of a PCB trace?

A straight PCB trace has about 1 nH per mm of length (varies with geometry). This becomes significant at high frequencies.

Q How is inductance related to frequency?

An inductor's impedance increases with frequency: XL = 2πfL. This is why inductors block high frequencies and pass low frequencies.

Q What is a henry in terms of other units?

One henry equals 1 V·s/A = 1 kg·m²/(A²·s²). It is the inductance that produces 1 volt when current changes at 1 ampere per second.

About This Tool

Inductance Converter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.