Petabit (Pb) - Unit Information & Conversion
What is a Petabit?
Definition
A petabit (Pb or Pbit) is a multiple of the bit unit for digital information or computer storage. The prefix peta- (symbol P) is defined in the International System of Units (SI) as a multiplier of 1015 (1 quadrillion, or 1 followed by 15 zeros). Therefore, 1 petabit = 1,000,000,000,000,000 bits. This is equivalent to 1,000 terabits (Tb) or 1,000,000 gigabits (Gb).
History
As data volumes and network speeds continued to increase dramatically beyond the terabit scale, the petabit became relevant for quantifying extremely large amounts of data and ultra-high transmission capacities. It strictly follows the SI definition of 'peta-' as 1015. The distinction between decimal (petabit, Pb) and binary (pebibit, Pib = 250 bits) became increasingly important at this scale, leading to the formalization of binary prefixes like 'pebi-' by the IEC to avoid ambiguity.
Common Uses
Petabits are primarily used in contexts involving massive data scales:
- Measuring the theoretical or actual data transfer rates of core internet backbones, major international communication links, and large-scale data center networks (often expressed in Pbps - petabits per second).
- Quantifying the aggregate data traffic processed by major internet exchange points (IXPs) or national telecommunications networks over specific timeframes.
- Describing the capacity of cutting-edge optical fiber communication systems and research networks.
- Characterizing the sheer volume of data generated or processed in large scientific endeavors, such as high-energy physics experiments, climate modeling, or large astronomical surveys, especially when discussing data transmission or raw bit counts.
- High-performance computing (HPC) environments dealing with massive datasets.
Unit FAQs
How many bits are in a petabit?
There are exactly 1,000,000,000,000,000 bits (one quadrillion bits, or 1015 bits) in 1 petabit (Pb), according to the standard SI definition of the prefix 'peta-'.
What is the difference between a petabit (Pb) and a petabyte (PB)?
- A petabit (Pb) measures data in bits and equals 1015 bits. It is commonly used for data transfer rates and network capacity.
- A petabyte (PB) measures data in bytes. According to SI standards, it equals 1015 bytes. It is typically used for measuring large storage capacities. (Note: The term pebibyte (PiB) correctly refers to 250 bytes).
Since 1 byte = 8 bits, 1 petabyte (1015 bytes) is equal to 8 x 1015 bits, or 8 petabits. Therefore, a petabyte represents 8 times more data than a petabit.
What is the difference between a petabit (Pb) and a pebibit (Pib)?
- A petabit (Pb) uses the decimal SI prefix 'peta-' and equals 1015 bits (1,000,000,000,000,000 bits).
- A pebibit (Pib) uses the binary IEC prefix 'pebi-' and equals 250 bits (1,125,899,906,842,624 bits).
A pebibit is approximately 12.6% larger than a petabit (1 Pib ≈ 1.126 Pb). Use Pb for contexts adhering to decimal standards (like network speeds) and Pib when precise binary multiples (powers of 2) are required (often related to memory or specific storage architectures).
How many gigabits (Gb) are in a petabit (Pb)?
There are 1,000,000 gigabits (Gb) in 1 petabit (Pb). This is derived from the SI prefixes: 1 Pb = 1015 bits and 1 Gb = 109 bits. Therefore, 1 Pb / 1 Gb = 1015 / 109 = 106 = 1,000,000.
Petabit Conversion Formulas
To Bit:
To Byte:
To Kilobit:
To Kilobyte:
To Megabit:
To Megabyte:
To Gigabit:
To Gigabyte:
To Terabit:
To Terabyte:
To Petabyte:
To Exabit:
To Exabyte:
To Kibibit:
To Kibibyte:
To Mebibit:
To Mebibyte:
To Gibibit:
To Gibibyte:
To Tebibit:
To Tebibyte:
To Pebibit:
To Pebibyte:
To Exbibit:
To Exbibyte:
Convert Petabit
Need to convert Petabit to other data storage units? Use our conversion tool.