Convert Gigabyte to Megabyte (GB → MB)

Converting gigabytes to megabytes 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

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

   The result is your value in megabytes (MB).

Multiply the value in gigabytes by 1,000. For the reverse direction, multiply by 0.001.

• ✓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 Megabyte?

The megabyte (MB) equals 1,000 kilobytes (1,000,000 bytes decimal, or 1,048,576 bytes binary as MiB). It is the everyday unit for image files, MP3 songs, and small documents on personal computers. A high-quality JPEG photograph is 2–10 MB, an MP3 song is 3–10 MB, a Microsoft Word document might be 0.05–5 MB, and a typical e-book is under 5 MB. Older USB flash drives and CDs hold hundreds of MB (a CD is 700 MB). Mobile data plans were originally measured in MB before gigabyte plans became standard. The megabyte relates to the kilobyte (1,000 KB = 1 MB), the gigabyte (1,000 MB = 1 GB), and the megabit (1 MB = 8 Mbit). Internet connection speeds are usually rated in Mbps (megabits per second), distinct from MBps (megabytes per second): 100 Mbps = 12.5 MBps.

• Photo and image file sizes
• MP3 and audio files
• Small video clips