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.
Divide MB by 1000. So 1000 MB = 1 GB, 5000 MB = 5 GB, 25000 MB = 25 GB. This matches the decimal convention used by storage manufacturers and most modern software.
Under the older binary convention, yes — 1 GiB (gibibyte) = 1024 MiB. Under the modern decimal SI convention used by drive manufacturers and most software, 1 GB = 1000 MB. Different contexts, different definitions.
Drive labels use decimal GB (1 GB = 1,000,000,000 bytes). Windows and some other tools display capacity in binary GiB (1 GiB = 1,073,741,824 bytes) but label it 'GB' anyway, causing the apparent 7% shortfall. macOS and Linux usually report the same number the label promises.
5 GB equals 5000 MB at the decimal definition used by mobile carriers. That equates to roughly 15-25 hours of music streaming, 3-5 hours of HD video, or 1500-2500 high-res photos.
GB is bigger by a factor of 1000. One gigabyte holds the equivalent of 1000 one-megabyte files, or roughly 250 average smartphone photos, or 30 minutes of standard-definition video.
Bits are different from bytes — 1 byte = 8 bits. ISPs quote internet speeds in megabits per second (Mbps), but file sizes in megabytes (MB). A 100 Mbps connection downloads at roughly 12.5 MB per second.
Email is usually a few KB. Smartphone photos run 2-5 MB. Songs are 3-10 MB. A movie ranges from 1-4 GB for HD; 4K can hit 50 GB. App installs vary from a few MB for utilities to 100+ GB for AAA games.
Use GB (decimal, 1000 MB) when discussing storage purchases, cloud billing, mobile data, and file transfer. Use GiB (binary, 1024 MiB) when discussing RAM, low-level system tools, or whenever the source explicitly says 'gibibyte'.