What is bit?
A bit is the smallest unit of digital information, representing a value of either 0 or 1. It is used to express network bandwidth, signal data rates, and low-level binary data in computing and telecommunications.
Real-world uses
Bits are the fundamental unit of data transmission. Network speeds (Wi-Fi, fibre broadband, mobile data) are measured in bits per second (bps and its multiples). Colour depth in digital displays is expressed in bits per channel (8-bit colour = 256 shades per channel). Audio resolution is described in bits (16-bit CD, 24-bit studio audio).
History
The term "bit" (contraction of "binary digit") was coined by mathematician John Tukey in 1947. Claude Shannon formalised the concept in his landmark 1948 paper "A Mathematical Theory of Communication," establishing information theory and defining the bit as the fundamental unit of information.
Common mistakes
Confusing bits with bytes — 8 bits = 1 byte. A "100 Mbps" internet connection transfers 100 megabits, or 12.5 megabytes, per second. Capitalisation matters: "b" = bit, "B" = byte, so "Mb" is not the same as "MB".
What is byte?
A byte is a fundamental unit of digital information, typically comprising 8 bits. It is the standard unit for measuring file size, storage capacity, and data transfer quantities in computing.
Real-world uses
The byte is the fundamental unit of digital information. File sizes, RAM capacity, hard drive storage, and network data quotas are all measured in bytes and their multiples. A byte is 8 bits and can represent 256 distinct values. Text encoding stores approximately 1 byte per ASCII character.
History
The term "byte" was coined by Werner Buchholz in 1956 while working at IBM on the Stretch computer. He defined it as a group of bits processed together. The 8-bit byte became standard with IBM System/360 in 1964 and has remained the universal digital unit since.
Common mistakes
Confusing bytes (B) with bits (b) — internet speed is often quoted in megabits per second (Mbps), while file sizes are in megabytes (MB). Downloading a 10 MB file at 10 Mbps takes about 8 seconds because 10 MB = 80 Mb.
When is this conversion used?
Converting bit to byte is useful in the data domain when comparing values across different measurement standards or applying formulas that require a specific unit.
Worked examples
1 bit = 0.125 byte
1 byte = 1 byte
How to convert bit to byte
To convert bit to byte, multiply the value by 0.125.
To convert byte back to bit, multiply by 8.
Measurement standards
The International Electrotechnical Commission (IEC 80000-13) defines binary prefixes: 1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes. The SI decimal prefixes (kB = 1,000 bytes, MB = 1,000,000 bytes) apply to data units as they do to all SI quantities.
Did you know?
By 2025, the global datasphere is estimated to reach 181 zettabytes — roughly 181 trillion gigabytes. If stored on standard Blu-ray discs, the stack would reach from Earth to Mars and back over 20 times.
Quick reference: bit to byte
| bit | byte |
|---|---|
| 0.1 | 0.0125 |
| 0.5 | 0.0625 |
| 1 | 0.125 |
| 2 | 0.25 |
| 5 | 0.625 |
| 10 | 1.25 |
| 25 | 3.125 |
| 50 | 6.25 |
| 100 | 12.5 |
| 250 | 31.25 |
| 500 | 62.5 |
| 1,000 | 125 |
Common values
| bit | byte | |
|---|---|---|
| A text email | 40,000 bit | 5,000 byte |
| An MP3 song (4 min) | 32,000,000 bit | 4,000,000 byte |
| A smartphone photo | 40,000,000 bit | 5,000,000 byte |
| An HD movie | 4.000000e+10 bit | 5.000000e+09 byte |
| A full hard drive | 8.000000e+12 bit | 1.000000e+12 byte |
Available Data units
More bit conversions
- Convert bit to byte
- Convert bit to kilobyte (decimal)
- Convert bit to megabyte (decimal)
- Convert bit to gigabyte (decimal)
- Convert bit to terabyte (decimal)
- Convert bit to kibibyte (binary)
- Convert bit to mebibyte (binary)
- Convert bit to gibibyte (binary)
- Convert bit to tebibyte (binary)
Assumption: both decimal (kB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) units are included.