Ohms (Ω)
The ohm is the SI unit of electrical resistance, impedance and reactance.
Convert ohms to any resistance unit
1 ohm = 0.001 kilohms
Quick facts
- Unit
- Ohm (plural: ohms)
- Symbol
- Ω
- Measures
- Electrical Resistance
- System
- SI
- Definition
- One volt per ampere.
- Also written
- V/A
1 ohm in other units
| Kilohms | 0.001 kΩ |
| Megohms | 0.000001 MΩ |
| Milliohms | 1,000 mΩ |
What is an ohm?
The ohm is the SI unit of electrical resistance, impedance and reactance. Loudspeakers are typically 4 or 8 Ω; the human body measures roughly 1,000 Ω between the hands when the skin is wet.
Where the ohm sits among resistance units
The ohm is number 4 of 10 on our scale of resistance units, ordered from smallest to largest.
Top ohm conversions
Common amounts of ohms
- 0.1 Ω
- 0.2 Ω
- 0.3 Ω
- 0.4 Ω
- 0.5 Ω
- 0.6 Ω
- 0.7 Ω
- 0.8 Ω
- 0.9 Ω
- 1 Ω
- 1.5 Ω
- 2 Ω
- 2.5 Ω
- 3 Ω
- 3.5 Ω
- 4 Ω
- 4.5 Ω
- 5 Ω
- 6 Ω
- 7 Ω
- 7.5 Ω
- 8 Ω
- 9 Ω
- 10 Ω
- 11 Ω
- 12 Ω
- 13 Ω
- 14 Ω
- 15 Ω
- 16 Ω
- 17 Ω
- 18 Ω
- 19 Ω
- 20 Ω
- 21 Ω
- 22 Ω
- 23 Ω
- 24 Ω
- 25 Ω
- 26 Ω
- 27 Ω
- 28 Ω
- 29 Ω
- 30 Ω
- 31 Ω
- 32 Ω
- 33 Ω
- 34 Ω
- 35 Ω
- 36 Ω
- 37 Ω
- 38 Ω
- 39 Ω
- 40 Ω
- 41 Ω
- 42 Ω
- 43 Ω
- 44 Ω
- 45 Ω
- 46 Ω
- 47 Ω
- 48 Ω
- 49 Ω
- 50 Ω
- 51 Ω
- 52 Ω
- 53 Ω
- 54 Ω
- 55 Ω
- 56 Ω
- 57 Ω
- 58 Ω
- 59 Ω
- 60 Ω
- 61 Ω
- 62 Ω
- 63 Ω
- 64 Ω
- 65 Ω
- 66 Ω
- 67 Ω
- 68 Ω
- 69 Ω
- 70 Ω
- 71 Ω
- 72 Ω
- 73 Ω
- 74 Ω
- 75 Ω
- 76 Ω
- 77 Ω
- 78 Ω
- 79 Ω
- 80 Ω
- 81 Ω
- 82 Ω
- 83 Ω
- 84 Ω
- 85 Ω
- 86 Ω
- 87 Ω
- 88 Ω
- 89 Ω
- 90 Ω
- 91 Ω
- 92 Ω
- 93 Ω
- 94 Ω
- 95 Ω
- 96 Ω
- 97 Ω
- 98 Ω
- 99 Ω
- 100 Ω
- 110 Ω
- 120 Ω
- 130 Ω
- 140 Ω
- 150 Ω
- 160 Ω
- 170 Ω
- 180 Ω
- 190 Ω
- 200 Ω
- 210 Ω
- 220 Ω
- 230 Ω
- 240 Ω
- 250 Ω
- 260 Ω
- 270 Ω
- 280 Ω
- 290 Ω
- 300 Ω
- 310 Ω
- 320 Ω
- 330 Ω
- 340 Ω
- 350 Ω
- 360 Ω
- 370 Ω
- 380 Ω
- 390 Ω
- 400 Ω
- 410 Ω
- 420 Ω
- 430 Ω
- 440 Ω
- 450 Ω
- 460 Ω
- 470 Ω
- 480 Ω
- 490 Ω
- 500 Ω
- 600 Ω
- 700 Ω
- 800 Ω
- 900 Ω
- 1,000 Ω
- 1,200 Ω
- 1,500 Ω
- 2,000 Ω
- 2,500 Ω
- 3,000 Ω
- 4,000 Ω
- 5,000 Ω
- 10,000 Ω
Convert ohms to all 9 other units
SI
Other
Convert to ohms
Frequently asked questions
What is an ohm?
The ohm is the SI unit of electrical resistance, impedance and reactance.
How is the ohm defined?
One volt per ampere.
How many kilohms are in an ohm?
One ohm equals 0.001 kilohms.
How many megohms are in an ohm?
One ohm equals 0.000001 megohms.
How many milliohms are in an ohm?
One ohm equals 1,000 milliohms.