Quick Answer: Gigabits to Gigabytes
One gigabit equals 0.125 gigabytes (1 Gb = 0.125 GB).
Conversely, 1 GB = 8 Gb.
Formula: GB = Gb ÷ 8
Worked examples
- 1 Gb = 0.125 GB
- 2.5 Gb = 0.3125 GB
- 5 Gb = 0.625 GB
Method and limitations
To convert gigabits to gigabytes, divide by 8. Calculations use full-precision constants; answers in this box are rounded for readability (≈ marks a rounded value) and the calculator shows up to 9 significant figures.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
To convert gigabits to gigabytes, divide by 8.
Step-by-Step Conversion Guide
Follow these steps to convert gigabits to gigabytes manually:
Start with your value in gigabits
Example: You want to convert 5 Gb
Apply the conversion formula
Use the formula: GB = Gb ÷ 8
Calculate the result
5 Gb = 0.625 GB
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
To convert gigabits to gigabytes, divide by 8.
Common Conversions
| Gigabits (Gb) | Gigabytes (GB) | Gigabytes → Gigabits |
|---|---|---|
| 1 Gb | 0.125 | 1 GB = 8 Gb |
| 2.5 Gb | 0.3125 | 2.5 GB = 20 Gb |
| 5 Gb | 0.625 | 5 GB = 40 Gb |
| 10 Gb | 1.25 | 10 GB = 80 Gb |
| 25 Gb | 3.125 | 25 GB = 200 Gb |
| 40 Gb | 5 | 40 GB = 320 Gb |
| 100 Gb | 12.5 | 100 GB = 800 Gb |
Did You Know?
Data storage units follow a binary system (1024) in computing but a decimal system (1000) in marketing — this is why your "500 GB" drive shows less space.
Popular Gigabits to Gigabytes Conversions
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Frequently Asked Questions
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Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.