Divide megabytes by 1000 (decimal) or 1024 (binary)
Two definitions coexist for historical reasons. Decimal (SI standard, used by storage manufacturers and networking): 1 GB = 1,000 MB exactly. Binary (originally used by RAM and operating systems): 1 GiB = 1,024 MiB exactly. The IEC standardized the binary prefixes (KiB, MiB, GiB) in 1999 specifically to remove ambiguity, but everyday usage still mixes them. ConvertBuddy uses the decimal convention because that matches drive labels, mobile-data caps, and most cloud-billing units.
Megabytes and gigabytes measure digital storage and data transfer. One gigabyte equals 1,000 megabytes in the decimal (SI) system used by hard drive manufacturers, mobile carriers, and cloud providers.
The same conversion holds for download caps, file sizes shown by operating systems, and bandwidth quotas. Older software sometimes uses the binary definition where 1 GB equals 1,024 MB (more precisely called a gibibyte, GiB), which is why a '500 GB' drive shows as 465 GB free in Windows.
MB-to-GB conversion comes up daily: planning mobile data usage, estimating cloud-storage costs, sizing backups, or interpreting file-transfer progress bars.
Carriers cap plans in GB but apps report download sizes in MB. Convert to track usage against the monthly cap and avoid overage charges.
S3, Google Cloud Storage, and Dropbox price by the gigabyte. File-size totals from desktop tools and backup software come in megabytes. Convert to estimate monthly bills.
AAA game installs run 50-150 GB. Patches and DLC list size in MB. Add them all in consistent units before estimating download time against your connection speed.
Gmail allows 25 MB attachments; Outlook 20 MB. Files shown in GB on disk need conversion to know whether they exceed the limit before clicking Send.
External drives are labeled in TB and GB. Individual folder sizes in operating system file explorers often default to MB. Add to plan whether one drive holds the full backup set.
1 GB = 1,000 MB (decimal) or 1,024 MB (binary/GiB).