💾 MB to GB Converter, Convert Megabytes to Gigabytes Instantly
By Shihab Mia · Updated 2026-07-28
1024 MB equals
1 GB
This MB to GB converter turns megabytes into gigabytes, or gigabytes back into megabytes, using either the binary standard (1 GB = 1024 MB, the way Windows and most operating systems count storage) or the decimal standard (1 GB = 1000 MB, the way hard drive and SSD makers label capacity). Type a value into either box and the other updates immediately, with a toggle above the fields to switch between the two standards. Knowing which standard applies is the main reason people get a "missing storage" number that does not match what they expected.
What is the MB to GB Converter?
A gigabyte is a larger unit built from megabytes, but "larger by how much" depends on which counting convention is being used. In binary counting, storage is measured in powers of 2, so 1 GB equals 2 to the 10th megabytes, which is 1024 MB. This is the convention Windows File Explorer, macOS Activity Monitor, and most software use when they report a file size or free disk space, even though many still label the unit "GB" instead of the technically correct "GiB" (gibibyte).
In decimal counting, storage is measured in powers of 10, so 1 GB equals 1000 MB exactly, the same pattern as kilometers to meters. This is the convention that hard drive, SSD, and USB drive manufacturers use on the box and in marketing, because it produces a bigger, rounder number and matches the International System of Units (SI) definition of the prefix "giga". A drive sold as "1 TB" contains 1,000,000,000,000 bytes by this decimal definition.
The mismatch between these two standards is exactly why a brand new "500 GB" drive shows up as roughly 465 GB of usable space in Windows. The manufacturer counted in decimal gigabytes (500 x 1,000,000,000 bytes), but the operating system displays the same byte count in binary gigabytes, and 500,000,000,000 bytes divided by 1024 cubed comes out to about 465.66. No storage is missing or defective, the two sides of the same number are just using different bases.
This converter lets you pick the standard that matches your situation. Use binary (1024) when you are checking a file size, RAM amount, or a number reported by an operating system, and use decimal (1000) when you are working from a manufacturer spec sheet, a network transfer rate, or any SI-labeled capacity. The formula either way is simple: divide megabytes by the chosen divisor to get gigabytes, or multiply gigabytes by the divisor to get megabytes.
When to use it
- Checking whether a downloaded file, video, or app installer will fit in the free space shown on your device.
- Reconciling a drive advertised in decimal gigabytes with the smaller binary gigabyte figure your operating system displays.
- Estimating how many photos, songs, or documents of a known MB size will fit into a GB storage plan or cloud tier.
- Converting a data allowance, upload limit, or bandwidth figure between MB and GB when comparing hosting, mobile, or cloud plans.
How to use the MB to GB Converter
- Choose Binary (1024) or Decimal (1000) at the top, matching whether the number came from an operating system/RAM (binary) or a manufacturer/network spec (decimal).
- Type a value into the Megabytes box to see the equivalent in Gigabytes, or type into the Gigabytes box to see the equivalent in Megabytes.
- Switch the toggle at any time to instantly recompute the same input under the other standard.
- Use the Copy result button to copy the converted value to your clipboard for pasting elsewhere.
Formula & method
Worked examples
Convert 2500 MB to GB using the binary standard (the value your phone or PC is likely reporting).
- Start with 2500 MB and the binary divisor of 1024.
- GB = 2500 / 1024
- GB = 2.4414
Result: 2500 MB is about 2.44 GB (binary).
Convert a manufacturer-listed 750 GB drive to MB using the decimal standard.
- Start with 750 GB and the decimal divisor of 1000.
- MB = 750 x 1000
- MB = 750,000
Result: 750 GB (decimal) equals 750,000 MB.
Common MB values converted to GB, binary vs decimal
| Megabytes (MB) | Binary GB (÷1024) | Decimal GB (÷1000) |
|---|---|---|
| 500 | 0.4883 | 0.5 |
| 1000 | 0.9766 | 1 |
| 1024 | 1 | 1.024 |
| 2048 | 2 | 2.048 |
| 5000 | 4.8828 | 5 |
| 10000 | 9.7656 | 10 |
Common GB values converted to MB, binary vs decimal
| Gigabytes (GB) | Binary MB (×1024) | Decimal MB (×1000) |
|---|---|---|
| 1 | 1024 | 1000 |
| 2 | 2048 | 2000 |
| 5 | 5120 | 5000 |
| 10 | 10240 | 10000 |
| 64 | 65536 | 64000 |
| 128 | 131072 | 128000 |
Common mistakes to avoid
- Assuming 1 GB always equals 1000 MB. Operating systems, RAM specs, and most software report storage in binary gigabytes, where 1 GB is 1024 MB. Only drive manufacturers and network/SI specs consistently use the decimal 1000 MB definition. Using the wrong one can throw off a calculation by more than 2 percent, which grows with the size of the number.
- Comparing an operating system figure directly to a box label. A "1 TB" drive is 1,000,000,000,000 bytes by the manufacturer decimal definition, but Windows displays that same byte count in binary units, showing roughly 931 GB. This is not missing storage, it is the same bytes measured with two different definitions of gigabyte.
- Ignoring that formatting and system files also use space. Even after accounting for the binary vs decimal gap, a drive shows less free space than its rated capacity because the file system, recovery partition, and pre-installed software also take up bytes. This converter only handles the unit conversion, not those additional reserved amounts.
- Rounding too early in a multi-step conversion. If you round an intermediate MB or GB figure to a whole number before doing a second conversion, small errors compound. Keep a few decimal places until the final answer, which is what this tool does automatically by computing with the full input value.
Glossary
- Megabyte (MB)
- A unit of digital storage. In binary terms it is 1,048,576 bytes (1024 KB); in decimal/SI terms it is 1,000,000 bytes.
- Gigabyte (GB)
- A unit of digital storage equal to 1024 MB under the binary convention, or 1000 MB under the decimal (SI) convention.
- Binary (IEC) standard
- A counting system based on powers of 2, where 1 GB = 1024 MB. Used by most operating systems and RAM specifications, sometimes properly labeled GiB (gibibyte).
- Decimal (SI) standard
- A counting system based on powers of 10, where 1 GB = 1000 MB exactly. Used by storage device manufacturers and the International System of Units.
- GiB (gibibyte)
- The technically precise name for a binary gigabyte (1024 MB), defined by the IEC to avoid confusion with the decimal gigabyte, though "GB" is still used informally for both.
- Byte
- The basic unit of digital storage, 8 bits, and the building block that both MB and GB are ultimately counted from.
Frequently asked questions
How many MB are in a GB?
It depends on the standard: 1024 MB in a binary GB (used by most operating systems), or 1000 MB in a decimal GB (used by storage manufacturers). This converter lets you toggle between both.
Is 1 GB equal to 1000 MB or 1024 MB?
Both are used in practice. Manufacturers and the SI system define 1 GB as 1000 MB, while operating systems and most software display 1 GB as 1024 MB. Neither is "wrong", they are different conventions for the same prefix.
Why does my drive show less space than advertised?
A drive marketed as, for example, 500 GB uses the decimal definition (500,000,000,000 bytes), but your operating system displays that same byte count using the binary definition, which produces a smaller number, around 465 GB. No capacity is actually missing.
How do I convert MB to GB manually?
Divide the megabyte value by 1024 for binary gigabytes, or by 1000 for decimal gigabytes. For example, 2048 MB divided by 1024 is exactly 2 binary GB, while the same 2048 MB divided by 1000 is 2.048 decimal GB.
Which standard should I use, binary or decimal?
Use binary (1024) when converting a file size, RAM amount, or any figure your operating system reported. Use decimal (1000) when converting a manufacturer spec, network bandwidth, or SI-labeled capacity from a data sheet or product box.
How many MB is 1 GB of mobile data?
Mobile carriers typically bill data allowances in decimal gigabytes, so 1 GB of mobile data is usually treated as 1000 MB, though the app on your phone that tracks usage may report it in binary MB instead.