1 GB = 1,000 MB (decimal). Operating systems may show 1,024 MB as 1 GB — that is actually 1 GiB (gibibyte), a binary unit.

Why does my 64 GB phone show less storage than expected?

Storage is sold in decimal GB (1 GB = 1,000,000,000 bytes). Your operating system reports in binary GiB (1 GiB = 1,073,741,824 bytes). 64 GB ÷ 1.073... = ~59.6 GiB, shown as 59.6 GB by the OS.

How many photos fit in 1 GB?

A typical smartphone JPEG photo at 12 MP is roughly 3–6 MB. At 4 MB average, 1 GB holds about 250 photos. RAW files are 20–40 MB each, so about 25–50 per GB.

Megabytes to Gigabytes Converter

1,000 MB = 1 GB (SI decimal). Hard drives use decimal GB; operating systems often show binary GiB.

Formula

GB = MB ÷ 1,000

Worked example

To convert 4,500 MB to GB, divide 4,500 ÷ 1,000 = 4.5 GB.

Quick reference table

MB	GB
100	0.1
256	0.256
500	0.5
750	0.75
1000	1
2000	2
4000	4
8000	8
16000	16

Unit definitions

Megabyte (MB)

A megabyte (MB) = 1,000,000 bytes (decimal, SI definition). Storage manufacturers and network speeds use this definition. Note: some OS tools show mebibytes (MiB = 1,048,576 bytes) and label them MB.

Gigabyte (GB)

A gigabyte (GB) = 1,000,000,000 bytes (decimal, SI definition). Hard drives and SSDs are advertised in decimal GB.

Common use cases

Checking file download sizes
Storage capacity planning
Photo and video file sizes
Memory card sizing

Gigabytes to Terabytes Terabytes to Gigabytes

Related guides

Binary vs Decimal Data Units: Bytes, Kibibytes, and Why 1 GB ≠ 1 GiB

A '1 TB' hard drive shows as 931 GB in Windows. A '16 GB' RAM stick looks like 15.3 GB in macOS. These discrepancies exist because storage manufacturers count bytes in powers of 10 while operating systems traditionally count in powers of 2. This guide explains both systems, their prefixes, and which to use when.

Frequently asked questions

← All data converters