Milliohms (mΩ)
The milliohm (mΩ) is one thousandth of an ohm.
Convert milliohms to any resistance unit
1 milliohm = 0.001 ohms
Quick facts
- Unit
- Milliohm (plural: milliohms)
- Symbol
- mΩ
- Measures
- Electrical Resistance
- System
- SI
- Equals
- 0.001 ohms
- Definition
- 0.001 Ω.
1 milliohm in other units
| Ohms | 0.001 Ω |
| Kilohms | 0.000001 kΩ |
| Megohms | 1 × 10-9 MΩ |
What is a milliohm?
The milliohm (mΩ) is one thousandth of an ohm. It is used for very low resistances: wires, busbars, connectors, switch contacts, batteries and current-sensing shunts, where even small resistance causes heat and voltage loss.
Where the milliohm sits among resistance units
The milliohm is number 3 of 10 on our scale of resistance units, ordered from smallest to largest.
What milliohms are used for
- Battery internal resistance (a healthy 18650 cell: about 20–50 mΩ).
- Current-sense shunt resistors in power electronics.
- Contact and connection resistance testing (micro-ohmmeters).
- Wire and cable resistance per meter.
Milliohms in real life
- 1 m of 2.5 mm² copper wire: about 7 mΩ.
- A car battery: about 3–6 mΩ internal resistance.
Top milliohm conversions
Common amounts of milliohms
- 0.25 mΩ
- 0.5 mΩ
- 0.75 mΩ
- 1 mΩ
- 1.5 mΩ
- 2 mΩ
- 2.5 mΩ
- 3 mΩ
- 4 mΩ
- 5 mΩ
- 6 mΩ
- 7 mΩ
- 8 mΩ
- 9 mΩ
- 10 mΩ
- 11 mΩ
- 12 mΩ
- 13 mΩ
- 14 mΩ
- 15 mΩ
- 16 mΩ
- 17 mΩ
- 18 mΩ
- 19 mΩ
- 20 mΩ
- 21 mΩ
- 22 mΩ
- 23 mΩ
- 24 mΩ
- 25 mΩ
- 26 mΩ
- 27 mΩ
- 28 mΩ
- 29 mΩ
- 30 mΩ
- 31 mΩ
- 32 mΩ
- 33 mΩ
- 34 mΩ
- 35 mΩ
- 36 mΩ
- 37 mΩ
- 38 mΩ
- 39 mΩ
- 40 mΩ
- 41 mΩ
- 42 mΩ
- 43 mΩ
- 44 mΩ
- 45 mΩ
- 46 mΩ
- 47 mΩ
- 48 mΩ
- 49 mΩ
- 50 mΩ
- 60 mΩ
- 70 mΩ
- 80 mΩ
- 90 mΩ
- 100 mΩ
- 150 mΩ
- 200 mΩ
- 250 mΩ
- 300 mΩ
- 400 mΩ
- 500 mΩ
- 750 mΩ
- 1,000 mΩ
Convert milliohms to all 9 other units
SI
Other
Convert to milliohms
Frequently asked questions
What is a milliohm?
The milliohm (mΩ) is one thousandth of an ohm.
How is the milliohm defined?
0.001 Ω.
How many ohms are in a milliohm?
One milliohm equals 0.001 ohms.
How many kilohms are in a milliohm?
One milliohm equals 0.000001 kilohms.
How many megohms are in a milliohm?
One milliohm equals 1e-9 megohms.