Megaohms to Ohms Converter (MΩ to Ω)
Convert megaohms to ohms (MΩ to Ω). See results in ohms, kilohms, and gigaohms. Essential for insulation testing, electrical safety, and high-impedance circuits in the US.
RESISTANCE IN OHMS
1,000,000 Ω
1,000 kΩ
0.001000 GΩ
1.000 µS
1×10⁶
MΩ to Ω — Quick Reference
| MΩ | Ω | kΩ | Application |
|---|---|---|---|
| 0.001 MΩ | 1,000 Ω | 1 kΩ | Standard resistor |
| 0.01 MΩ | 10,000 Ω | 10 kΩ | Pull-up/pull-down resistor |
| 0.1 MΩ | 100,000 Ω | 100 kΩ | Sensor circuit |
| 0.5 MΩ | 500,000 Ω | 500 kΩ | High-impedance circuit |
| 1 MΩ | 1,000,000 Ω | 1,000 kΩ | Insulation testing threshold |
| 2 MΩ | 2,000,000 Ω | 2,000 kΩ | Motor insulation (min) |
| 5 MΩ | 5,000,000 Ω | 5,000 kΩ | Cable insulation |
| 10 MΩ | 10,000,000 Ω | 10,000 kΩ | Transformer insulation |
| 100 MΩ | 100,000,000 Ω | 100,000 kΩ | High-voltage insulation |
| 1000 MΩ | 1,000,000,000 Ω | 1,000,000 kΩ | Power line insulator |
How to Convert Megaohms to Ohms
Multiply by 1,000,000 (one million):
Example: 1 MΩ (insulation test threshold)
= 1 × 1,000,000 = 1,000,000 Ω
Example: 0.1 MΩ (sensor circuit)
= 0.1 × 1,000,000 = 100,000 Ω
Example: 10 MΩ (transformer insulation)
= 10 × 1,000,000 = 10,000,000 Ω
Remember: "Mega" means million. 1 MΩ = 1,000 kΩ = 1,000,000 Ω. Megaohms are used when resistance values are extremely high — typically in insulation testing and high-impedance circuits.
Resistance Unit Hierarchy
| Unit | Symbol | = How Many Ω | Typical Use |
|---|---|---|---|
| Milliohm | mΩ | 0.001 | Wire resistance, contact resistance |
| Ohm | Ω | 1 | Standard resistors, speakers |
| Kilohm | kΩ | 1,000 | Pull-up resistors, voltage dividers |
| Megaohm | MΩ | 1,000,000 | Insulation testing, high-Z circuits |
| Gigaohm | GΩ | 1,000,000,000 | PCB leakage, ultra-high-Z |
Insulation Resistance Standards (US)
| Equipment | Min Insulation (MΩ) | In Ohms | Standard |
|---|---|---|---|
| Electric motors (< 1kV) | 1 MΩ minimum | 1,000,000 Ω | IEEE 43 |
| Electric motors (> 1kV) | 1 MΩ per kV + 1 | Varies | IEEE 43 |
| Power cables (600V) | 1–5 MΩ | 1–5 million Ω | NETA MTS |
| Transformers | 2–100+ MΩ | 2–100+ million Ω | IEEE C57.12 |
| Switchgear | 100+ MΩ | 100+ million Ω | NFPA 70B |
| Residential wiring | 1+ MΩ | 1+ million Ω | NEC |
Megger Testing Guide
| Reading | In MΩ | In Ω | Verdict |
|---|---|---|---|
| 0–0.5 MΩ | < 0.5 | < 500,000 | 🔴 Bad — replace immediately |
| 0.5–1 MΩ | 0.5–1 | 500k–1M | 🟡 Questionable — investigate |
| 1–5 MΩ | 1–5 | 1M–5M | 🟢 Acceptable — monitor |
| 5–100 MΩ | 5–100 | 5M–100M | 🟢 Good |
| 100+ MΩ | 100+ | 100M+ | 🟢 Excellent |
Common US Electrical Applications
| Application | Typical Range | In Ohms | Why MΩ |
|---|---|---|---|
| Multimeter input impedance | 10 MΩ | 10,000,000 Ω | Avoids loading the circuit |
| Oscilloscope probe | 1–10 MΩ | 1M–10M Ω | High-impedance measurement |
| ESD protection | 1–100 MΩ | 1M–100M Ω | Static dissipation |
| Humidity sensor | 0.1–100 MΩ | 100k–100M Ω | Varies with moisture |
| Photoresistor (dark) | 1–10 MΩ | 1M–10M Ω | High in dark, low in light |
What Is a Megaohm (MΩ)?
Megaohm (MΩ) = 1,000,000 ohms = 1,000 kilohms. It's the standard unit for measuring insulation resistance, used by electricians and maintenance technicians across the US. Megger testers (insulation resistance testers) display readings in MΩ. Per the NEC and IEEE standards, insulation must meet minimum MΩ thresholds to be considered safe.
What Is an Ohm (Ω)?
Ohm (Ω) is the SI unit of electrical resistance, named after Georg Simon Ohm. It measures how much a material resists the flow of electric current. Per Ohm's Law: V = I × R, where V is voltage (volts), I is current (amps), and R is resistance (ohms). A 1 Ω resistor allows 1 amp to flow when 1 volt is applied.