To convert gigohms to megohms, multiply by 1000. That factor is the whole relationship: both units measure how strongly a component opposes current, so the conversion is a proportion with no offset and no substance-specific constant.
One mega ohm is a million of a ohm (1e6 ohms). One giga ohm is a billion of a ohm (1e9 ohms).
The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in megohms, so you can sanity-check whether your answer is a plausible size.
The formula
gigohms- The amount you are converting, in gigohms
1000- The exact number of megohms in one gigohm
megohms- The converted result
How it works, step by step
- Enter the value in gigohms.
- It is multiplied by 1000, the exact factor between the two units.
- The answer is shown in megohms, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Human skin, dry: 0.0001 GΩ in megohms
At 0.0001 GΩ (human skin, dry), the same quantity in megohms is 0.0001 × 1000 = 0.1 MΩ. One gigohm is 1000 megohms, so the numbers grow as expected.
Multimeter input impedance: 0.01 GΩ in megohms
Multimeter input impedance comes to about 0.01 GΩ. Multiplying by the factor: 0.01 × 1000 = 10 MΩ. Dividing the answer back by 1000 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many megohms are in one gigohm?
Exactly 1000. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert gigohms to megohms?
megohms = gigohms × 1000. Reversed, gigohms = megohms ÷ 1000, which is the same as multiplying by 0.001.
Which is the bigger unit, the gigohm or the megohm?
The gigohm. One gigohm equals 1000 megohms.
What does this quantity actually measure?
Both units measure how strongly a component opposes current. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a gigohm?
One giga ohm is a billion of a ohm (1e9 ohms).
What is a megohm?
One mega ohm is a million of a ohm (1e6 ohms).
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Gigohms to megohms reference tables
| Gigohms | Megohms |
|---|---|
| 0.5 GΩ | 500 MΩ |
| 1 GΩ | 1000 MΩ |
| 2 GΩ | 2000 MΩ |
| 3 GΩ | 3000 MΩ |
| 5 GΩ | 5000 MΩ |
| 10 GΩ | 10,000 MΩ |
| 20 GΩ | 20,000 MΩ |
| 25 GΩ | 25,000 MΩ |
| 50 GΩ | 50,000 MΩ |
| 75 GΩ | 75,000 MΩ |
| 100 GΩ | 100,000 MΩ |
| 250 GΩ | 250,000 MΩ |
| 500 GΩ | 500,000 MΩ |
| 1000 GΩ | 1e+06 MΩ |
| 5000 GΩ | 5e+06 MΩ |
Exact factor: 1 gigohm = 1000 megohms.
| Quantity | GΩ | MΩ |
|---|---|---|
| Typical LED series resistor | 2.2e-07 GΩ | 0.00022 MΩ |
| Common pull-up resistor | 1e-05 GΩ | 0.01 MΩ |
| Multimeter input impedance | 0.01 GΩ | 10 MΩ |
| Copper wire, 1 m of 1.5 mm2 | 1.210e-11 GΩ | 1.21e-08 MΩ |
| Human skin, dry | 0.0001 GΩ | 0.1 MΩ |
| Heating element, 2 kW at 230 V | 2.645e-08 GΩ | 2.645e-05 MΩ |
Published reference values, converted with the same factor this page uses.