MB to GB Converter

Convert megabytes to gigabytes and between every other data size, using decimal (1000) or binary (1024) units.

Enter a size in any unit and see it in all the others. Switch between decimal and binary to match how your device reports storage.

In gigabytes

—

  • —Bytes
  • —KB
  • —MB
  • —GB
  • —TB

How Does It Work?

  1. Enter a size and its unitBytes through terabytes, whichever the file manager or spec sheet gave you.
  2. Choose decimal or binaryDecimal for drive marketing figures and network speeds, binary for what Windows, macOS and Linux report.
  3. Read every unit at onceThe whole ladder from bytes to terabytes is converted together.

What Is It Used For?

Storage has two competing definitions. Drive manufacturers use decimal units where a gigabyte is 1,000 megabytes, while operating systems traditionally use binary units where it is 1,024. That difference is exactly why a "1 TB" drive shows up as about 931 GB once it is plugged in — nothing is missing, the two sides are just counting differently.

  • Checking whether a file will fit in an upload or email attachment limit.
  • Understanding why a new drive shows less capacity than the box claimed.
  • Converting a hosting or mobile data allowance quoted in MB.
  • Sizing a backup, a video export or a database dump.
  • Comparing cloud storage tiers priced per GB.

Examples

SizeSystemEquals
1 GBDecimal1,000 MB
1 GiBBinary1,024 MiB
2,048 MBDecimal2.048 GB
2,048 MiBBinary2 GiB
1 TB (decimal)Shown by an OS≈ 931 GiB
25 MBDecimal25,000 KB

Frequently Asked Questions

How many MB are in a GB?

It depends on the system. In decimal units, used by drive manufacturers and internet providers, 1 GB = 1,000 MB. In binary units, used by most operating systems, 1 GiB = 1,024 MiB.

Why does my 1 TB drive show only 931 GB?

The manufacturer counted 1 TB as 1,000,000,000,000 bytes in decimal units, while your operating system divides by 1,024 three times and displays 931 GiB. The bytes are all there — only the labelling differs.

What is the difference between GB and GiB?

GB is the decimal gigabyte, 1,000³ bytes. GiB is the binary gibibyte, 1,024³ bytes, about 7.4% larger. The GiB, MiB and KiB names were introduced to remove the ambiguity.

Which system should I use?

Use decimal for anything sold or advertised — drive capacity, mobile data, broadband speed. Use binary when checking what your computer reports about a file or a disk.

How do megabits differ from megabytes?

A byte is eight bits. Internet speeds are quoted in megabits per second (Mbps), so a 100 Mbps connection downloads at about 12.5 MB per second.

Free. No registration. This tool runs entirely in your browser, so the data you enter stays on your device.

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