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Converters

Electrical Resistance Converter

Convert electrical resistance accurately between picoohms, nanoohms, microohms, milliohms, ohms, kiloohms, megaohms, gigaohms and teraohms using exact SI decimal prefixes.

Example: a resistance is 2,500 milliohms. How many ohms is that?
Result 2.5 Ω 2,500 mΩ = 2.5 Ω
One-unit equivalent 1 mΩ = 0.001 Ω A quick way to understand the relationship between the two units.

✓ The ohm and SI-prefix relationships match definitions from the National Institute of Standards and Technology (NIST)

How is the conversion calculated? The ohm (Ω) is the SI derived unit of electrical resistance, with 1 ohm equal to 1 volt per ampere. Pico, nano, micro, milli, kilo, mega, giga and tera use exact decimal SI prefixes. The converter preserves the input sign for measurements or models that use signed resistance values.

This calculation runs in your browser. Your values are not sent to our server.

How it works

  1. Enter an electrical-resistance value, then choose the source and target units.
  2. Example: 2,500 milliohms equals exactly 2.5 ohms.
  3. The ohm (Ω) is the SI derived unit of electrical resistance; 1 Ω = 1 V/A.
  4. Pico, nano, micro, milli, kilo, mega, giga and tera use exact SI decimal prefixes from 10⁻¹² through 10¹².
  5. The converter preserves the input sign, which is useful for measurements or models that use signed resistance values.
  6. This tool converts resistance units only; it does not apply Ohm’s law to calculate voltage or current.

FAQ

How many milliohms are in 1 ohm?

1 ohm equals exactly 1,000 milliohms.

How many ohms are in 2,500 milliohms?

2,500 milliohms equals exactly 2.5 ohms.

How many ohms are in 1 kiloohm?

1 kiloohm equals exactly 1,000 ohms.

How many ohms are in 1 megaohm?

1 megaohm equals exactly 1,000,000 ohms.

Does this tool calculate Ohm’s law?

No. This page converts resistance units only. Calculating voltage or current with Ohm’s law requires additional electrical values.

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