MB to GB Converter
Convert MB to GB free online. Supports decimal (1 GB = 1000 MB) and binary (1 GiB = 1024 MiB) for accurate digital storage conversion across drives and files.
About This Calculator
Our free MB to GB converter instantly converts between megabytes and gigabytes using both numeral system standards. Whether you are buying a hard drive, managing computer memory, checking file sizes, or working with cloud storage, this tool gives you accurate results in both decimal (SI) and binary (IEC) formats.
What Are Megabytes and Gigabytes?
A megabyte (MB) is a unit of digital information equal to 1,000,000 bytes in the decimal system or 1,048,576 bytes (220) in the binary system. A gigabyte (GB) equals 1,000,000,000 bytes (109) in decimal or 1,073,741,824 bytes (230) in binary. These units are used to measure storage capacity of hard drives, SSDs, USB flash drives, memory cards, RAM, and file sizes.
Why Are There Two Different Systems?
The decimal system (1 GB = 1000 MB) follows the International System of Units (SI) and is used by storage manufacturers to advertise drive capacities. The binary system (1 GiB = 1024 MiB) follows the International Electrotechnical Commission (IEC) standard and is used by operating systems like Windows, macOS, and Linux when displaying file and drive sizes. To resolve this ambiguity, the IEC introduced the gibibyte (GiB) and mebibyte (MiB) units specifically for binary multiples.
How the Conversion Works
To convert MB to GB, divide by 1000 (decimal) or 1024 (binary). To convert GB to MB, multiply by 1000 (decimal) or 1024 (binary). Our converter handles both directions automatically — enter either field and the result updates instantly for both systems.
Regional Notes
Worldwide: The decimal vs binary distinction applies globally. Storage manufacturers in every country (Seagate, Western Digital, Samsung, Toshiba) use decimal GB for marketing. All major operating systems (Windows, macOS, Linux, iOS, Android) use binary GiB for file sizes. Network speeds (Mbps, Gbps) universally use decimal prefixes per IEEE and ITU standards.
Frequently Asked Questions
How do you convert MB to GB?
To convert megabytes (MB) to gigabytes (GB), divide the MB value by 1000 for the decimal system (hard drives, SSDs, network speeds) or by 1024 for the binary system (computer RAM, Windows file sizes). For example, 2048 MB equals 2.048 GB (decimal) or 2 GiB (binary).
What is the difference between decimal GB and binary GiB?
Decimal GB (gigabyte) uses 1000 MB = 1 GB following the SI metric system, commonly used by hard drive manufacturers, SSDs, USB drives, and network bandwidth. Binary GiB (gibibyte) uses 1024 MiB = 1 GiB, used by operating systems like Windows to report file sizes and RAM. This difference means a 500 GB hard drive shows as approximately 465 GiB in Windows.
How many MB are in 1 GB?
In the decimal system, 1 GB equals 1000 MB. In the binary system, 1 GiB equals 1024 MiB. Most hard drive and SSD manufacturers use the decimal definition, while operating systems like Windows use the binary definition.
Is 1024 MB equal to 1 GB?
1024 MB equals 1 GiB (gibibyte) in the binary system, which is how Windows and many operating systems measure file sizes. In the decimal system used by drive manufacturers, 1024 MB equals 1.024 GB. Our converter shows both values so you can compare.
Why does my 500 GB hard drive show only 465 GB in Windows?
Hard drive manufacturers use the decimal system where 1 GB = 1000 MB, so a 500 GB drive has 500,000,000,000 bytes. Windows uses the binary system where 1 GiB = 1024 MiB = 1,073,741,824 bytes. Dividing 500,000,000,000 by 1,073,741,824 gives approximately 465 GiB. This 7% difference is normal and applies to all storage devices.
How many MB is a 1 GB file?
A 1 GB file is 1000 MB in the decimal system as reported by hard drive specifications, or 1024 MiB in the binary system as shown by Windows and macOS file properties. This distinction matters when transferring files between devices that use different numeral systems.
What uses decimal GB vs binary GiB?
Decimal GB (1000 MB) is used by hard drive and SSD manufacturers, cloud storage providers (Google Drive, Dropbox), network speed ratings (Mbps/Gbps), and USB drive capacities. Binary GiB (1024 MiB) is used by operating systems (Windows, macOS, Linux) for file sizes, computer RAM, and software memory allocation.
Is this MB to GB conversion tool free to use?
Yes, this MB to GB converter is completely free to use with no limits or registration required. It works on any device including desktop, tablet, and mobile browsers.