How many bytes are in 1 GB?

In the SI decimal standard used by storage manufacturers and most consumer devices, 1 GB = 1,000,000,000 bytes (10^9). This differs from the binary standard.

What is the difference between GB and GiB?

GB (gigabyte) uses base-10: 1 GB = 1,000,000,000 bytes. GiB (gibibyte) uses base-2: 1 GiB = 1,073,741,824 bytes. Hard drives use GB; operating systems often report GiB, which is why a 500 GB drive shows as ~465 GiB in Windows or macOS.

How many bytes are in 1 GiB?

1 GiB = 2^30 = 1,073,741,824 bytes. This is the binary standard defined by IEC 80000-13.

Why does my 1 TB drive show less space in my OS?

Drive makers measure in SI GB (10^9 bytes), while operating systems display in binary GiB (2^30 bytes). A 1 TB drive holds exactly 1,000,000,000,000 bytes but shows as ~931 GiB in Windows or macOS.

Gigabytes to Bytes Converter

Name: Gigabytes to Bytes Converter
Availability: InStock
Author: Nham Vu

Convert gigabytes to bytes using SI decimal (1 GB = 1,000,000,000 B) or binary IEC (1 GiB = 1,073,741,824 B).

Gigabytes to Bytes

Gigabytes

Standard

SI decimal (GB = 10⁹ B) IEC binary (GiB = 2³⁰ B)

Enter a value to see the byte conversion

Quick Reference

Gigabytes	Bytes (SI · GB)	Bytes (IEC · GiB)

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Summary

Convert gigabytes to bytes using SI decimal (1 GB = 1,000,000,000 B) or binary IEC (1 GiB = 1,073,741,824 B).

How it works

Enter a gigabyte value in the input field.
Select SI decimal (GB) or IEC binary (GiB) standard.
The byte result appears instantly below.
Click Copy to copy the raw byte number to your clipboard.

Use cases

Calculate exact byte count for disk or SSD capacity comparisons.
Determine memory requirements for software or operating system specifications.
Convert cloud storage quotas from gigabytes to bytes for API calls.
Verify network bandwidth figures when working with throughput calculations.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu