Petabytes (PB)
The petabyte (PB) is 1,000,000,000,000,000 bytes under the SI (decimal) definition used by storage manufacturers, network equipment and macOS.
Convert petabytes to any data unit
1 petabyte = 1,000,000 gigabytes
Quick facts
- Unit
- Petabyte (plural: petabytes)
- Symbol
- PB
- Measures
- Information / Data
- System
- Decimal (SI)
- Equals
- 1 × 1015 bytes
- Definition
- 1,000,000,000,000,000 bytes (10^15), the SI definition.
1 petabyte in other units
| Gigabytes | 1,000,000 GB |
| Megabytes | 1,000,000,000 MB |
| Bytes | 1 × 1015 B |
| Terabytes | 1,000 TB |
| Bits | 8 × 1015 bit |
| Kilobytes | 1,000,000,000,000 kB |
| Gigabits | 8,000,000 Gbit |
| Megabits | 8,000,000,000 Mbit |
What is a petabyte?
The petabyte (PB) is 1,000,000,000,000,000 bytes under the SI (decimal) definition used by storage manufacturers, network equipment and macOS. Windows still reports sizes with 1024-based units but labels them PB, which is why a new drive shows less space than advertised. The binary counterpart is the pebibyte (PiB).
Where the petabyte sits among data units
The petabyte is number 47 of 64 on our scale of data units, ordered from smallest to largest.
Petabytes in real life
- The Internet Archive stores well over 100 PB of data.
One petabyte is about 100 Libraries of Congress.
Top petabyte conversions
Common amounts of petabytes
- 0.25 PB
- 0.5 PB
- 0.75 PB
- 1 PB
- 1.5 PB
- 2 PB
- 2.5 PB
- 3 PB
- 4 PB
- 5 PB
- 6 PB
- 7 PB
- 8 PB
- 9 PB
- 10 PB
- 11 PB
- 12 PB
- 13 PB
- 14 PB
- 15 PB
- 16 PB
- 17 PB
- 18 PB
- 19 PB
- 20 PB
- 21 PB
- 22 PB
- 23 PB
- 24 PB
- 25 PB
- 26 PB
- 27 PB
- 28 PB
- 29 PB
- 30 PB
- 31 PB
- 32 PB
- 33 PB
- 34 PB
- 35 PB
- 36 PB
- 37 PB
- 38 PB
- 39 PB
- 40 PB
- 41 PB
- 42 PB
- 43 PB
- 44 PB
- 45 PB
- 46 PB
- 47 PB
- 48 PB
- 49 PB
- 50 PB
- 60 PB
- 70 PB
- 80 PB
- 90 PB
- 100 PB
- 150 PB
- 200 PB
- 250 PB
- 300 PB
- 400 PB
- 500 PB
- 750 PB
- 1,000 PB
Convert petabytes to all 63 other units
Bits & bytes
- PB to B
- PB to bit
- PB to nibble
- PB to o
- PB to block
- PB to word (16-bit)
- PB to DWORD
- PB to QWORD
- PB to crumb
- PB to memory page
- PB to octaword
Decimal (SI)
- PB to GB
- PB to MB
- PB to TB
- PB to kB
- PB to Gbit
- PB to Mbit
- PB to Tbit
- PB to kbit
- PB to Pbit
- PB to EB
- PB to Ebit
- PB to ZB
- PB to YB
- PB to Zbit
- PB to Ybit
- PB to QB
- PB to RB
- PB to Qbit
- PB to Rbit
Binary (IEC)
- PB to GiB
- PB to MiB
- PB to KiB
- PB to TiB
- PB to PiB
- PB to Gibit
- PB to Mibit
- PB to EiB
- PB to Kibit
- PB to Tibit
- PB to YiB
- PB to ZiB
- PB to Pibit
- PB to Eibit
- PB to Yibit
- PB to Zibit
Legacy binary (JEDEC)
Information theory
Media & everyday comparisons
Convert to petabytes
Frequently asked questions
What is a petabyte?
The petabyte (PB) is 1,000,000,000,000,000 bytes under the SI (decimal) definition used by storage manufacturers, network equipment and macOS.
How is the petabyte defined?
1,000,000,000,000,000 bytes (10^15), the SI definition.
How many gigabytes are in a petabyte?
One petabyte equals 1,000,000 gigabytes.
How many megabytes are in a petabyte?
One petabyte equals 1,000,000,000 megabytes.
How many bytes are in a petabyte?
One petabyte equals 1e15 bytes.