Gigabytes (GB) to Bytes (B) Converter
Enter your Gigabytes (GB) value to convert to Bytes (B). 1 GB = 1,000,000,000 B, calculated across both decimal (SI) and binary (IEC) standards.
Convert Gigabytes to Bytes
Do you want to convert bytes to gigabytes?
How to Convert Gigabytes to Bytes
To convert gigabytes to bytes, multiply by 1,000,000,000. This gives you the equivalent storage size in the target unit. Learn more: how many GB in Bytes.
GB: A gigabyte is 1,000 megabytes or 1,000,000,000 bytes using the SI decimal standard. This is what hard drive manufacturers typically use. Learn more: how many Terabytes in a GB.
B: A byte consists of 8 bits and is the standard unit for measuring digital storage. One byte can represent 256 different values (0-255). See also: calculate Mb to B.
1 GB = 1,000,000,000 B (using SI decimal standard) — which means there are 1,000,000,000bytes in every gigabyte.
GB to B Conversion Formula
// Convert GB to B
B = GB × 1,000,000,000
// Reverse: Convert B to GB
GB = B × 0.000000001
GB to B Conversion Examples
100 GB = 100,000,000,000 B
256 GB = 256,000,000,000 B
500 GB = 500,000,000,000 B
1,000 GB = 1,000,000,000,000 B
2,048 GB = 2,048,000,000,000 B
What Is a Gigabyte?
A gigabyte is 1,000 megabytes or 1,000,000,000 bytes using the SI decimal standard. This is what hard drive manufacturers typically use. You might also need: Tb to TB conversion rate.
The gigabyte is a SI decimal unit of digital information storage. It uses base 1,000 following the SI (International System of Units) standard. Check out our converting Gigabits Per Second to Terabytes Per Second.
Common uses: Movies, video games, smartphone storage, USB drives, cloud storage plans See also: Gigabytes in Kilobytes.
1 GB = 8 × 10⁹ bits = 1 × 10⁹ bytes.
The gigabyte can be abbreviated as GB; for example, 1 gigabyte can be written as 1 GB.
What Is a Byte?
A byte consists of 8 bits and is the standard unit for measuring digital storage. One byte can represent 256 different values (0-255). Try the nibble to B.
The byte is a fundamental unit of digital information storage. It uses base 1,000 following the SI (International System of Units) standard. Related: Mb to Yib converter.
Common uses: File sizes, memory addressing, character encoding (ASCII, UTF-8) Learn more: TiB/s to Tibps calculator.
1 B = 8 bits = 1 bytes.
The byte can be abbreviated as B; for example, 1 byte can be written as 1 B.
Gigabyte to Byte Conversion Table
The table below shows various gigabyte measurements converted to bytes.
| Gigabytes | Bytes |
|---|---|
| 1 GB | 1,000,000,000 B |
| 2 GB | 2,000,000,000 B |
| 5 GB | 5,000,000,000 B |
| 10 GB | 10,000,000,000 B |
| 25 GB | 25,000,000,000 B |
| 50 GB | 50,000,000,000 B |
| 100 GB | 100,000,000,000 B |
| 128 GB | 128,000,000,000 B |
| 250 GB | 250,000,000,000 B |
| 256 GB | 256,000,000,000 B |
| 500 GB | 500,000,000,000 B |
| 512 GB | 512,000,000,000 B |
| 1,000 GB | 1,000,000,000,000 B |
| 1,024 GB | 1,024,000,000,000 B |
SI Decimal vs Binary: Why Two Different Standards?
When converting gigabytes to bytes, different tools may give slightly different results. This is because there are two competing standards for measuring digital storage:
| Standard | Base | 1 KB equals | Used By |
|---|---|---|---|
| SI Decimal | 1000 | 1,000 bytes | Hard drive manufacturers, macOS, network speeds |
| Binary (IEC) | 1024 | 1,024 bytes | Windows, Linux (partially), RAM specifications |
Why Does My Hard Drive Show Less Space Than Advertised?
This difference in standards explains the common "missing hard drive space" confusion.
Example: A "500 GB" Hard Drive
- Contains exactly: 500,000,000,000 bytes
- macOS (SI Decimal): Displays 500 GB (divides by 1,000³)
- Windows (Binary): Displays 465 GB (divides by 1,024³)
The Verdict: Same bytes, same drive—just different math. No space is actually missing.
Note: Our calculator defaults to SI decimal (base 1000) to match the box label. To match Windows, toggle the standard at the top of the calculator.
💡 Storage Engineer Tip
For accurate capacity planning, always verify whether specifications use SI decimal (base 1000) or binary (base 1024) units. The difference becomes significant at larger scales.
— Subash Geetha Krishnan, 15+ years in enterprise storage
When to Convert GB to B
Common scenario: Planning storage allocation, comparing specifications, or converting between gigabyte and byte for capacity planning. See also: convert GB to PiB.
Other situations include storage planning for calculating how much data fits in a given capacity, file management for understanding sizes across different scales, cost estimation for budgeting cloud storage, and backup planning for determining media requirements. Use our Yottabytes to Bytes conversion.