Convert Gigabyte to Byte (GB → B)

Converting gigabytes to bytes is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in gigabytes

   Start with the number of gigabytes (GB) you want to convert.
2. 2
   Multiply by 1,000,000,000

   The conversion factor from GB to B is 1,000,000,000. Multiply your value by this number.
3. 3
   Read the result in bytes

   The result is your value in bytes (B).

Multiply the value in gigabytes by 1,000,000,000. For the reverse direction, multiply by 1 × 10^-9.

• ✓SI: 1 GB = 1000 MB = 10⁹ B. Binary GiB = 2³⁰ B.
• ✓Hard drives use SI; OS may show binary — discrepancy ~7%.
• ✓Mobile data plans: SI GB.

• ✗Expecting 64 GB drive to hold 64 × 1,073,741,824 B — it's 64 × 10⁹ B (7% less by binary measure).
• ✗Confusing GB with Gb (gigabit, 1/8).
• ✗Mixing GB and GiB without noting the discrepancy.

What is the Gigabyte?

The gigabyte (GB) equals 1,000 megabytes (1,000,000,000 bytes decimal, or 1,073,741,824 bytes as GiB binary) and is the standard unit for smartphone storage, mobile data plans, and modern application sizes. Modern smartphones offer 64–1,024 GB of storage, mobile data plans range from 1 to 50+ GB per month, and operating-system installations typically require 20–80 GB. A 4K video stream consumes 6–8 GB per hour, and a typical app download is 50–500 MB to a few GB. The famous discrepancy between manufacturer-advertised capacity (GB decimal) and operating-system-displayed capacity (GiB binary) means a '1 TB' drive shows about 931 GB to the user. The gigabyte relates to the megabyte (1,000 MB = 1 GB), the terabyte (1,000 GB = 1 TB), the gibibyte (1 GiB = 1.074 GB), and the gigabit (1 GB = 8 Gbit).

• Phone and device storage
• Mobile-data plan allowances
• Memory (RAM) sizes

What is the Byte?

The byte equals 8 bits and is the smallest addressable storage unit in modern computing and digital systems. Byte-sized addresses are universal in computer architectures from microcontrollers to supercomputers, making the byte the fundamental block of memory and storage. A single ASCII character is 1 byte (256 possible values), basic UTF-8 characters use 1–4 bytes, and a UTF-16 character uses 2 bytes. File sizes, RAM capacity, and disk space are all measured in bytes and their multiples. The byte relates to the bit (1 byte = 8 bits), the kilobyte (1,000 or 1,024 bytes — see decimal vs. binary), the kibibyte (1,024 bytes, the strict computing standard), and larger multiples (MB, GB, TB). Note: storage manufacturers use decimal (1 GB = 10⁹ bytes), while operating systems often use binary (1 GiB = 2³⁰ bytes), causing the famous discrepancy where a '1 TB drive' shows about 931 GB free.

• File sizes everywhere (documents, images, video)
• RAM and storage capacity
• Character encoding in programming