GB to Bytes Converter
Enter a value in gigabytes and choose your standard.
How to convert GB to bytes
Converting gigabytes (GB) to bytes is straightforward once you know which unit system is being used. In storage marketing and most network contexts, GB uses decimal base-10. In operating systems and memory contexts, the number is often interpreted in binary using GiB (gibibytes), even if people casually say “GB.”
- Decimal: 1 GB = 1,000,000,000 bytes
- Binary: 1 GiB = 1,073,741,824 bytes
This calculator supports both so you can choose the exact standard your project needs.
GB to bytes formula
Decimal formula
Bytes = GB × 1,000,000,000
Binary formula
Bytes = GiB × 1,073,741,824
Example conversions
- 1 GB = 1,000,000,000 bytes (decimal)
- 5 GB = 5,000,000,000 bytes (decimal)
- 1 GiB = 1,073,741,824 bytes (binary)
- 10 GiB = 10,737,418,240 bytes (binary)
Quick reference table
| Gigabytes value | Bytes (Decimal GB) | Bytes (Binary GiB) |
|---|---|---|
| 0.5 | 500,000,000 | 536,870,912 |
| 1 | 1,000,000,000 | 1,073,741,824 |
| 2 | 2,000,000,000 | 2,147,483,648 |
| 10 | 10,000,000,000 | 10,737,418,240 |
| 100 | 100,000,000,000 | 107,374,182,400 |
When should you use decimal vs binary?
Use decimal GB when you are reading hard drive labels, cloud storage plans, data transfer bills, or ISP quotas. Use binary GiB when checking memory and many OS-level file sizes where base-2 measurement is expected.
If you’re building software tools, always label units explicitly. Showing “GB” and “GiB” separately avoids confusion and prevents costly miscalculations at scale.
Common mistakes to avoid
- Assuming GB and GiB are identical.
- Mixing decimal and binary units in one report.
- Forgetting separators when reading large byte values.
- Not documenting conversion rules in technical specs.
FAQ
Is 1 GB always 1 billion bytes?
In strict SI decimal usage, yes. But many tools display binary values and users still call them GB. Technically that should be GiB.
Why does my drive show less capacity than advertised?
Manufacturers usually advertise decimal GB. Operating systems may display in binary units, so the number appears smaller.
Can this calculator handle decimal GB values like 1.75?
Yes. Enter fractional values and the converter will compute exact numeric output using JavaScript number precision.