Electrical Resistance Converter
Convert electrical resistance between Ω, mΩ, kΩ, and MΩ instantly.
Useful for electronics design, resistor selection, and cable resistance calculations.
Type in any field — the others update instantly.
Resistance measures how strongly a material opposes the flow of electric current. The SI unit is the ohm (Ω), named after Georg Ohm. Put one volt across one ohm and exactly one ampere flows, which is Ohm’s law in its plainest form.
Metric prefixes:
- 1 Ω = 1,000 mΩ (milliohms)
- 1 kΩ = 1,000 Ω (kilohms)
- 1 MΩ = 1,000,000 Ω (megohms)
Ohm’s law:
- Resistance = Voltage ÷ Current (R = V / I)
For scale:
- A meter of thin copper wire: about 0.017 Ω
- A typical resistor: 100 Ω to 10 kΩ
- Dry human skin: 1–100 kΩ
That last figure is why voltage matters so much for safety. Dry skin’s high resistance limits the current a low voltage can drive through you, but wet skin can fall to a few hundred ohms, and the same voltage then pushes far more current.
One distinction trips up anyone moving from DC to AC: resistance is not impedance. Resistance applies to steady direct current. In an AC circuit, capacitors and inductors add a frequency-dependent opposition called reactance, and the combination is impedance, also measured in ohms. A part can have almost zero resistance yet a large impedance at the right frequency, which is the whole basis of how filters and tuned circuits work.
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This converter runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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