Inductance Converter Online — Free Inductance Converter Tool
CodexFuse Team · 2026-10-31T08:45:32.360Z · 9 min read min read
Free inductance converter: convert H, mH, µH and nH instantly, with a worked example and honest limits.
An inductance converter is a free online tool that changes an inductance value from one unit to another — henries to millihenries, microhenries to nanohenries, and back again — without manual decimal-point arithmetic. If you work with coils, chokes, transformers, or switch-mode power supplies, a single misplaced decimal can turn a working circuit into a smoking one.
The pain is rarely the maths itself. A datasheet lists 4.7 mH, a supplier catalogue lists 4700 µH, and a forum post recommends 0.0047 H. All three values are identical, but they do not look identical at a glance — and that visual mismatch is where ordering errors and wasted bench time start.
What is an inductance converter?
An inductance converter is a unit-conversion tool that takes a number in one inductance unit and instantly shows its equivalent in other units, using fixed metric factors. One henry equals 1,000 millihenries, 1,000,000 microhenries, and 1,000,000,000 nanohenries, so the tool simply moves the decimal point by the correct number of places for the units you choose.
Inductance measures how strongly a coil resists a change in current. A larger inductance stores more energy in its magnetic field and reacts more slowly to current changes — which is why inductors smooth power supplies, filter signals, and tune radio circuits, and why getting the value right matters far more than getting it roughly right.
Why do inductance units cause so many mistakes?
The metric prefixes look deceptively similar on a busy datasheet. The difference between mH and µH is a factor of 1,000, yet the two symbols differ by one character — easy to miss on a phone screen or in a scanned PDF. Suppliers make it worse by not standardising: small RF inductors are usually quoted in nH, power inductors in µH, and large chokes in mH.
A 1,000× error is not a rounding problem. An inductor that is 1,000 times too small in a buck converter will saturate, overheat, and may take the switching transistor with it. Always convert the value and sanity-check it against the circuit's expected range before you order or solder.
How do you convert between henry, millihenry, microhenry, and nanohenry?
To convert inductance, multiply or divide by powers of 1,000 as you move between adjacent metric units: moving to a smaller unit multiplies the number by 1,000, and moving to a larger unit divides it by 1,000. For example, 2.2 mH becomes 2,200 µH when you move one step smaller, and 2,200 µH becomes 0.0022 H when you move two steps larger.
| From | To | Multiply by | Example |
|---|---|---|---|
| 1 H | millihenry (mH) | 1,000 | 0.01 H = 10 mH |
| 1 mH | microhenry (µH) | 1,000 | 4.7 mH = 4,700 µH |
| 1 µH | nanohenry (nH) | 1,000 | 10 µH = 10,000 nH |
| 1 µH | millihenry (mH) | 0.001 | 470 µH = 0.47 mH |
Every step is a clean factor of 1,000 — there is no awkward constant to memorise, which is precisely why a converter helps: it removes the one remaining failure mode, counting zeros. The same discipline helps elsewhere: a capacitance converter handles the farad side of a filter design, and a frequency converter keeps hertz, kilohertz, and megahertz straight.
Worked example: the repair bench that nearly ordered the wrong choke
The scenario (fictional, with real numbers): Imran runs a small electronics repair shop. A customer's audio amplifier arrives with a burnt output choke, and the only legible marking on the failed part reads "470 µH". His usual supplier lists the nearest equivalent as 0.47 mH, and a second listing shows 470,000 nH.
Step 1 — Confirm the starting value: Imran treats 470 µH as the reference value from the original part. He does not round it to 500 µH, because in a filter circuit a 6% shift changes the cutoff frequency.
Step 2 — Convert before comparing: He opens the CodexFuse inductance converter, enters 470, selects µH, and reads the equivalents: 0.47 mH and 470,000 nH. Both supplier listings now match the original part exactly.
Step 3 — Check the rest of the specification: Conversion only proves the inductance matches. Imran still checks the replacement's current rating (the original was rated 3 A) and its DC resistance before ordering, because a converter cannot verify those values.
The result: The correct choke arrives first time, the amplifier is repaired the same week, and Imran avoids a return shipment and a week of bench downtime. The conversion took under a minute; the mistake it prevented would have cost far more. The same habit helps when you turn current ratings into power figures with an amps-to-watts converter before sizing a supply.
If mismatched datasheets, supplier catalogues, and schematics keep slowing down your repairs and designs, CodexFuse gives you the converter free — and the same fully managed platform can run your workshop's website, email, and backups on credits, with no subscription to babysit.
Get Started with CodexFuseHow do you use the CodexFuse inductance converter?
The tool page is deliberately minimal, and that is a strength on a busy bench. It works in three steps, exactly as the page describes them.
- Enter the value: type the inductance number you already have, such as 470 or 4.7, into the input field.
- Choose the units: pick the unit your value is currently in, then the unit you want — the tool covers 10 units across the henry scale.
- Read the result instantly: the converted value appears immediately in your browser, with no download or calculation sheet to maintain.
One practical habit: after converting, read the result back aloud in the new unit before typing it into an order form. That five-second check catches transcription errors that no converter can catch for you.
When a datasheet gives a range rather than a single value — for example, 10 µH ±20% — convert both ends of the range, not just the nominal value. A filter designed for 8 µH behaves differently from one designed for 12 µH, and converting only the middle number hides that spread.
What can this inductance converter not do?
Honest limits matter here, because a unit converter looks authoritative even when the input is wrong. This tool converts numbers; it does not measure, test, or validate a physical inductor.
- It does not measure inductance: it cannot tell you the value of an unmarked coil — for that you need an LCR meter or a known test circuit.
- It does not check saturation current: two inductors with the same inductance can saturate at very different currents, so always check the current rating separately.
- It does not account for tolerance or temperature drift: a nominal 100 µH part may measure 80–120 µH depending on tolerance, and ferrite cores drift with temperature.
- It does not verify Q factor or self-resonant frequency: both matter in RF designs, and neither follows from the inductance value alone.
If any of those properties decide whether your circuit works, the converter is only the first step: use it to get the units right, then confirm the remaining specifications in the datasheet.
How does CodexFuse fit a small electronics business beyond the tool?
A repair shop usually has the same IT headache as any other small business: a website that needs hosting, an email address customers trust, and records worth backing up — spread across three subscriptions, three renewal dates, and three support queues. CodexFuse replaces that sprawl with one fully managed platform on credits.
The concrete workflow is simple. Move the workshop website onto CodexFuse managed hosting, so updates and uptime are handled for you. Set up business email on the same platform, so quotes and repair updates come from your own domain. Use the platform's backup for job records and schematics, so a failed laptop does not become lost business data. You pay with credits as you use services, with no subscription locking you into a plan you outgrew.
Bookmark the companion tools alongside this one: the capacitance converter for filter capacitors and the frequency converter for oscillator and filter calculations.
Frequently Asked Questions
How many microhenries are in one millihenry?
There are 1,000 microhenries in one millihenry. So 4.7 mH equals 4,700 µH, and 0.47 mH equals 470 µH.
What is the difference between mH and µH?
mH stands for millihenry (one-thousandth of a henry) and µH stands for microhenry (one-millionth of a henry). One millihenry is 1,000 times larger than one microhenry, which is why confusing the two causes such large errors.
Is the CodexFuse inductance converter free?
Yes. The tool page states it is free with unlimited use, and it runs instantly in your browser.
Can I convert henries to nanohenries with this tool?
Yes. The tool covers 10 inductance units, including henries, millihenries, microhenries, and nanohenries. One henry equals 1,000,000,000 nanohenries, so a converter is far more reliable than counting nine zeros by hand.
Does converting inductance change the physical inductor I need?
No. Conversion only restates the same physical value in different units — 470 µH and 0.47 mH describe the identical coil. It changes which listing you can compare it against, not the part itself.
Why does my converted value look different from the supplier's listing?
Suppliers often round to a standard series value or quote a nominal value with a tolerance band. If your value is within a few percent of the listing, check the tolerance and current rating; if it is off by a factor of 10 or 1,000, re-check the units before ordering.
Convert it once, get it right, and move on
Every inductor mistake in this article traces back to the same moment: a value copied in the wrong unit and never checked. Break that habit today. Open the CodexFuse inductance converter, convert your next inductor value before you order or solder, and read the result back in the new unit. Then, if subscription sprawl is eating your workshop's time the way unit mix-ups eat its bench time, move your hosting, business email, and backups to CodexFuse — one fully managed platform, paid with credits, no subscriptions to babysit. Get started with CodexFuse today and put both problems behind you.
