Gigabytes to Bytes
Type a value in either box to convert between gigabytes and bytes. The factor is 1e+09.
| Gigabytes | Bytes |
|---|---|
| 1 GB | 1000000000 B |
| 2 GB | 2000000000 B |
| 3 GB | 3000000000 B |
| 5 GB | 5000000000 B |
| 10 GB | 10000000000 B |
| 25 GB | 25000000000 B |
| 50 GB | 50000000000 B |
| 100 GB | 100000000000 B |
How to use
- Enter a value in the Gigabytes field.
- The Bytes figure appears immediately — no button to press.
- Typing in the Bytes field converts back to Gigabytes the same way.
- Use the reference table for the values that come up most often.
Gigabytes to Bytes formula
To convert gigabytes to bytes, multiply by 1e+09.
B = GB × 1e+09
Why this factor: the gigabyte and the byte are both defined against the byte, so dividing one definition by the other gives 1e+09 directly. Both definitions are set out in full below.
To go the other way, divide by 1e+09 — or use the Bytes to Gigabytes converter, which is the same calculation reversed.
Worked example
Start with 4 GB. Multiply by 1e+09 to get 4000000000 B.
4 GB × 1e+09 = 4000000000 B
The converter above does this for any value you type, in either direction.
What is a gigabyte?
A gigabyte is one billion bytes — the everyday unit of storage and memory capacity.
Definition: Exactly 1,000,000,000 bytes under SI prefixes. The binary gibibyte (GiB) is 1,073,741,824 bytes.
Where it is used: Phone and laptop storage, RAM capacity, video file sizes, and cloud storage plans.
What is a byte?
A byte is eight bits — historically the space for one text character, and the standard unit of file size.
Definition: Exactly 8 bits.
Where it is used: File and storage sizes, memory capacity, and data quotas.
Gigabytes vs Bytes
The gigabyte and the byte belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many bytes are in a gigabyte?
One gigabyte equals 1e+09 bytes.
What is the formula to convert gigabytes to bytes?
Multiply the number of gigabytes by 1e+09. To reverse it, divide by 1e+09 instead.
How do I convert bytes back to gigabytes?
Divide by 1e+09, which is the same as multiplying by 1e-09.
How many bytes are in 10 gigabytes?
10 GB works out to 10000000000 B.
How is the gigabyte defined?
Exactly 1,000,000,000 bytes under SI prefixes. The binary gibibyte (GiB) is 1,073,741,824 bytes.