Zettabytes (ZB)
The zettabyte (ZB) is 1,000,000,000,000,000,000,000 bytes under the SI (decimal) definition used by storage manufacturers, network equipment and macOS.
Convert zettabytes to any data unit
1 zettabyte = 1,000,000,000,000 gigabytes
Quick facts
- Unit
- Zettabyte (plural: zettabytes)
- Symbol
- ZB
- Measures
- Information / Data
- System
- Decimal (SI)
- Equals
- 1 × 1021 bytes
- Definition
- 1,000,000,000,000,000,000,000 bytes (10^21), the SI definition.
1 zettabyte in other units
| Gigabytes | 1,000,000,000,000 GB |
| Megabytes | 1 × 1015 MB |
| Bytes | 1 × 1021 B |
| Terabytes | 1,000,000,000 TB |
| Bits | 8 × 1021 bit |
| Kilobytes | 1 × 1018 kB |
| Gigabits | 8,000,000,000,000 Gbit |
| Megabits | 8 × 1015 Mbit |
What is a zettabyte?
The zettabyte (ZB) is 1,000,000,000,000,000,000,000 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 ZB, which is why a new drive shows less space than advertised. The binary counterpart is the zebibyte (ZiB).
Where the zettabyte sits among data units
The zettabyte is number 55 of 64 on our scale of data units, ordered from smallest to largest.
Zettabytes in real life
- Humanity creates on the order of 150–200 zettabytes of data a year.
Top zettabyte conversions
Common amounts of zettabytes
Convert zettabytes to all 63 other units
Bits & bytes
- ZB to B
- ZB to bit
- ZB to nibble
- ZB to o
- ZB to block
- ZB to word (16-bit)
- ZB to DWORD
- ZB to QWORD
- ZB to crumb
- ZB to memory page
- ZB to octaword
Decimal (SI)
- ZB to GB
- ZB to MB
- ZB to TB
- ZB to kB
- ZB to Gbit
- ZB to Mbit
- ZB to Tbit
- ZB to kbit
- ZB to PB
- ZB to Pbit
- ZB to EB
- ZB to Ebit
- ZB to YB
- ZB to Zbit
- ZB to Ybit
- ZB to QB
- ZB to RB
- ZB to Qbit
- ZB to Rbit
Binary (IEC)
- ZB to GiB
- ZB to MiB
- ZB to KiB
- ZB to TiB
- ZB to PiB
- ZB to Gibit
- ZB to Mibit
- ZB to EiB
- ZB to Kibit
- ZB to Tibit
- ZB to YiB
- ZB to ZiB
- ZB to Pibit
- ZB to Eibit
- ZB to Yibit
- ZB to Zibit
Legacy binary (JEDEC)
Information theory
Media & everyday comparisons
Convert to zettabytes
Frequently asked questions
What is a zettabyte?
The zettabyte (ZB) is 1,000,000,000,000,000,000,000 bytes under the SI (decimal) definition used by storage manufacturers, network equipment and macOS.
How is the zettabyte defined?
1,000,000,000,000,000,000,000 bytes (10^21), the SI definition.
How many gigabytes are in a zettabyte?
One zettabyte equals 1,000,000,000,000 gigabytes.
How many megabytes are in a zettabyte?
One zettabyte equals 1e15 megabytes.
How many bytes are in a zettabyte?
One zettabyte equals 1e21 bytes.