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Convert Resistance

Here you can convert units like gigaohm, megaohm, kiloohm, ohm, etc. within the resistance category.

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Unit Value Actions
gigaohm GΩ
megaohm MΩ
kiloohm kΩ
ohm Ω SI derived unit of electrical resistance. One volt per ampere. Read more
milliohm mΩ
microohm µΩ

Common resistance conversion mistakes

  • The µ prefix is often written u in datasheets and on components, because the character is missing from ordinary keyboards. uΩ and µΩ are the same unit, the microohm.
  • The milliohm and the megaohm are written mΩ and MΩ and sit a factor of a billion apart. Upper and lower case carry the whole difference, and insulation testing in MΩ is easy to confuse with contact testing in mΩ.
  • Resistor markings such as 4k7 and 2M2 put the prefix where the decimal point would be. 4k7 is 4.7 kΩ, not 47 kΩ, and 2M2 is 2.2 MΩ.

Quick conversion quiz

Score: 0

18 ohm equals 0.018 kiloohm.

Correct answer: 18 ohm = 0.018 kiloohm.

5.2 kiloohm equals 0.00312 megaohm.

Correct answer: 5.2 kiloohm = 0.0052 megaohm.

208 milliohm equals 2.08e+5 microohm.

Correct answer: 208 milliohm = 2.08e+5 microohm.

Definitions

ohm (Ω)

SI derived unit of electrical resistance. One volt per ampere.

The ohm (Ω) is the SI unit of electrical resistance, defined as one volt per ampere. It is named after Georg Ohm. Component markings often write kilohms as k and megohms as M, so 4k7 means 4.7 kiloohm.

Read more about ohm at bipm.org

Frequently asked questions

How many ohms are in a kiloohm?

1000. Every prefix step in resistance is a factor of 1000: 1 GΩ = 1000 MΩ, 1 MΩ = 1000 kΩ and 1 kΩ = 1000 Ω.

What does 4k7 mean on a resistor?

4.7 kiloohm. The prefix sits where the decimal point would be, so a smudged print cannot lose the point. 1R0 means 1.0 ohm and 2M2 means 2.2 megaohm.

What does Ohm's law say?

Resistance = voltage divided by current, that is R = U/I. 12 V at 3 A gives 4 Ω. The voltage converts in the voltage converter.

How do I work out the power in a resistor?

P = R·I². A 100 Ω resistor carrying 0.1 A dissipates 1 W. The power then converts in the power converter.

Why is the microohm sometimes written uohm?

Because the µ character is missing from many keyboards. uΩ and µΩ are the same unit, the microohm, one millionth of an ohm. Contact and busbar resistances are usually quoted that way.

How do I use the resistance converter on konvertera.nu?

Enter your resistance value (like kΩ), choose the target unit (like Ω), and konvertera.nu converts it instantly.