Gigabits to Megabytes Converter

How to Convert Gigabits to Megabytes

To convert a data storage measurement from gigabits to megabytes, multiply the value by the conversion factor. Since one gigabit is equal to 128 megabytes, you can use this formula:

The data storage in megabytes is equal to the gigabits multiplied by 128.

How Many Megabytes Are in a Gigabit?

There are 128 megabytes in one gigabit.

What Is a Gigabit?

The gigabit (symbol: Gb) is a unit of digital information equal to 1,073,741,824 bits (2³⁰) in the binary system, or 1,000,000,000 bits in the decimal system. Gigabits are used to describe high-speed data transfer rates and network capacities. Gigabit networking has become the standard for modern local area networks (LANs). Gigabit Ethernet (1 Gbps) is standard in homes and offices, while 10 Gbps, 25 Gbps, 40 Gbps, and 100 Gbps Ethernet standards are used in data centers and enterprise networks. Consumer internet service providers increasingly offer gigabit-speed plans (1 Gbps), particularly through fiber-optic connections. At gigabit speeds, a typical HD movie (about 5 GB) can be downloaded in approximately 40 seconds, and a full Blu-ray disc image (25 GB) in about 3.3 minutes. In data center networking, gigabits per second is the baseline measurement. Modern server connections typically start at 10 Gbps, with backbone links running at 100 Gbps or even 400 Gbps. The cumulative bandwidth of a large data center can reach multiple terabits per second.

One gigabit is equal to:

• 1,073,741,824 bits (b)
• 1,024 megabits (Mb)
• 134,217,728 bytes (B)
• 128 megabytes (MB)
• 0.125 gigabytes (GB)

What Is a Megabyte?

The megabyte (symbol: MB) is a unit of digital information equal to 1,048,576 bytes (1,024 × 1,024, or 2²⁰) in the binary system, or 1,000,000 bytes in the decimal system. It is one of the most commonly referenced units in everyday computing. The megabyte is commonly used interchangeably with the mebibyte (MiB), which is the IEC standard name for exactly 1,048,576 bytes. Storage device manufacturers typically use the decimal definition (1 MB = 1,000,000 bytes), which is why a "500 GB" hard drive appears as approximately 465 GB in your operating system. Megabytes are the standard unit for measuring the size of photos, documents, and songs. A typical smartphone photo is 2–5 MB, a compressed MP3 song about 3–5 MB, a one-page PDF document about 100–500 kB, and an email attachment limit is commonly 25 MB. In mobile data plans, usage is often tracked in megabytes and gigabytes. Streaming music uses about 1–2 MB per minute at standard quality, while streaming video uses about 3–7 MB per minute for standard definition and 20–40 MB per minute for HD.

One megabyte is equal to:

• 1,048,576 bytes (B)
• 1,024 kilobytes (kB)
• 8,388,608 bits (b)
• 8 megabits (Mb)
• 1/1,024 gigabytes (GB)

Understanding Data Storage Units

Data storage units measure the amount of digital information that can be stored, transmitted, or processed. The fundamental unit is the bit (binary digit), which can hold a value of 0 or 1. All digital information, from text documents to 4K videos, is ultimately represented as sequences of bits.

Data storage units are organized in two main hierarchies: bits (b, kb, Mb, Gb, Tb, Pb, Eb) and bytes (B, kB, MB, GB, TB, PB, EB). The relationship between them is that 1 byte = 8 bits. Bits are typically used for data transfer rates (internet speed), while bytes are used for storage capacity (file sizes, drive capacity).

Binary vs. Decimal Prefixes

There are two conventions for data storage prefixes, which can cause confusion:

• Binary (base-2): Each prefix step is a factor of 1,024 (2¹⁰). So 1 kB = 1,024 B, 1 MB = 1,024 kB, etc. This is used by operating systems and in most computing contexts. This converter uses the binary convention.
• Decimal (base-10): Each prefix step is a factor of 1,000. So 1 kB = 1,000 B, 1 MB = 1,000 kB, etc. This is used by storage device manufacturers and in telecommunications.

To avoid confusion, the IEC introduced binary prefixes: kibibyte (KiB = 1,024 B), mebibyte (MiB = 1,024 KiB), gibibyte (GiB = 1,024 MiB), etc. However, these names are not widely used in everyday language.

Common Data Sizes in Perspective

• 1 Bit: A single binary digit (0 or 1)
• 1 Byte (8 bits): One text character (ASCII)
• 1 Kilobyte (1,024 bytes): A short paragraph of text
• 1 Megabyte (1,024 kB): A compressed photo or one minute of MP3 audio
• 1 Gigabyte (1,024 MB): About 250 MP3 songs or a short HD video
• 1 Terabyte (1,024 GB): About 250,000 photos or 500 hours of HD video
• 1 Petabyte (1,024 TB): About 1,000 consumer hard drives
• 1 Exabyte (1,024 PB): Roughly 11 million hours of 4K video

Data Transfer Rates vs. Storage

An important distinction exists between data transfer rates and storage capacity:

• Transfer rates use bits per second: kbps, Mbps, Gbps (note lowercase 'b')
• Storage capacity uses bytes: kB, MB, GB, TB (note uppercase 'B')

To convert between them, divide the bit rate by 8 to get the byte rate. For example, a 100 Mbps internet connection can transfer at most 12.5 MB per second (100 / 8 = 12.5).

Tips for Data Storage Conversions

• To convert between adjacent byte units (kB → MB → GB → TB → PB → EB), divide by 1,024 to go up or multiply by 1,024 to go down. The same applies to bit units (kb → Mb → Gb → Tb → Pb → Eb).
• To convert between bits and bytes at the same prefix level, divide bits by 8 to get bytes, or multiply bytes by 8 to get bits. For example: 100 Mb = 12.5 MB.
• When comparing internet speed (in Mbps) with file size (in MB), divide the speed by 8 to estimate download time. A 100 Mbps connection downloads at about 12.5 MB/s, so a 1 GB file takes about 80 seconds.
• Storage manufacturers use decimal (1 GB = 1,000,000,000 bytes) while operating systems use binary (1 GB = 1,073,741,824 bytes). This is why a "500 GB" drive shows as about 465 GB in your OS.
• A nibble is exactly 4 bits (half a byte) and represents one hexadecimal digit. Two nibbles make one byte.
• Memory (RAM) sizes always use binary: 4 GB, 8 GB, 16 GB, 32 GB. These are exact powers of 2 in bytes.
• When estimating storage needs: text files are measured in kB, photos and songs in MB, movies and games in GB, hard drives in TB, and data centers in PB or EB.

Gigabits to Megabytes Conversion Table

The following table shows conversions from gigabits to megabytes, using the binary convention (1 kB = 1,024 B).

Related Data Storage Converters

Convert from Gigabits

Convert to Megabytes