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Convert milliohms to ohms instantly. Essential for low-resistance measurements, power electronics, and contact resistance testing.
Ω = mΩ ÷ 1000
mΩ = Ω × 1000
| Milliohms (mΩ) | Ohms (Ω) |
|---|---|
| 1 | 0.001 |
| 10 | 0.01 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
| 2,500 | 2.5 |
| 5,000 | 5 |
| 10,000 | 10 |
| 50,000 | 50 |
| 100,000 | 100 |
A milliohm (mΩ) is a unit of electrical resistance equal to one-thousandth of an ohm. The prefix "milli" indicates a factor of 0.001 in the metric system. Milliohms are used for measuring very low resistances, such as those found in power distribution systems, thick conductors, electrical contacts, and shunt resistors. Precision milliohm measurements are critical in applications where even tiny resistances can cause significant power loss or voltage drops.
The ohm (Ω) is the standard SI unit of electrical resistance, named after German physicist Georg Simon Ohm who discovered the fundamental relationship between voltage, current, and resistance. One ohm is defined as the resistance that allows one ampere of current to flow when one volt is applied. Ohms quantify how much a material or component restricts the flow of electric current, making it fundamental to all electrical and electronic calculations.
Converting milliohms to ohms is straightforward:
Example: 500 mΩ ÷ 1,000 = 0.5 Ω
To convert milliohms to ohms, divide the milliohm value by 1,000. For example, 250 mΩ ÷ 1,000 = 0.25 Ω. The prefix "milli" means one-thousandth, so this conversion is exact and always consistent.
100 milliohms equals 0.1 ohms (or 1/10th of an ohm). This is a common resistance value for current sense resistors in power electronics, where low resistance minimizes power loss while still providing measurable voltage drop for current monitoring.
Milliohms are essential for measuring very low resistances where using ohms would result in inconvenient decimal values. For instance, "50 mΩ" is clearer than "0.050 Ω". Low-resistance measurements are critical in power electronics, battery testing, and quality control of electrical connections.
Measuring milliohm-level resistance requires a four-wire (Kelvin) measurement technique using a specialized milliohmmeter or precision multimeter. This method eliminates lead resistance errors that would otherwise dominate the measurement. Standard two-wire measurements are inadequate for resistances below about 100 ohms.
Good electrical contacts typically have resistance below 10 milliohms, with excellent connections measuring 1-5 mΩ. High-quality connectors and switches should maintain contact resistance below 5 mΩ throughout their lifetime. Values above 20 mΩ indicate oxidation, contamination, or mechanical problems requiring attention.
Yes, internal resistance measured in milliohms is a key indicator of battery health. New batteries typically have 10-50 mΩ internal resistance depending on chemistry and size. As batteries age or degrade, internal resistance increases, reducing their ability to deliver current efficiently. Regular milliohm measurements can predict battery failure before it occurs.