Byte / Bit Unit Converter
Convert between bits, bytes, KB, MB, GB, TB, PB — decimal (SI) and binary (IEC) standards.
Input Value
File Size Reference
Decimal Units (SI)
Powers of 10| Unit | Symbol | = Bytes | Result |
|---|---|---|---|
| Bit | bit | 0.125 | 8,000,000,000 |
| Byte | B | 1 | 1,000,000,000 |
| Kilobyte | KB | 1,000 | 1,000,000 |
| Megabyte | MB | 1,000,000 | 1,000 |
| Gigabyte | GB | 1,000,000,000 | 1 |
| Terabyte | TB | 1,000,000,000,000 | 0.00100000 |
| Petabyte | PB | 1,000,000,000,000,000 | 0.00000100000 |
Binary Units (IEC)
Powers of 1024| Unit | Symbol | = Bytes | Result |
|---|---|---|---|
| Bit | bit | 0.125 | 8,000,000,000 |
| Byte | B | 1 | 1,000,000,000 |
| Kibibyte | KiB | 1,024 | 976,562.5 |
| Mebibyte | MiB | 1,048,576 | 953.6743164 |
| Gibibyte | GiB | 1,073,741,824 | 0.931323 |
| Tebibyte | TiB | 1.10e+12 | 0.000909495 |
| Pebibyte | PiB | 1.13e+15 | 8.88178e-7 |
Download Time Calculator
How long to transfer this file at a given connection speed?
Download time at 100 Mbps
1m 20s
1,000,000,000 bytes
÷ 12,500,000 B/s
1 Mbps
2h 13m
10 Mbps
13m 20s
100 Mbps
1m 20s
Storage Comparison
1,000,000,000 bytes is equivalent to approximately:
💿
CD-ROM
700 MB
×1.4
🧬
Human genome
3.2 GB
31.3%
📀
Standard DVD
4.7 GB
21.3%
🔵
Blu-ray disc
25 GB
4.0%
🎵
MP3 song (~5 MB)
5 MB
×200
🖼️
JPEG photo (~4 MB)
4 MB
×250
📱
iPhone 256 GB
256 GB
0.4%
💾
Floppy disk
1.44 MB
×694
Quick Conversions
1 GB
1 TB
1 MB
SI vs IEC — Why does my 1 TB drive show 931 GiB?
Decimal (SI) — used by manufacturers
1 KB = 1,000 bytes · 1 MB = 1,000,000 bytes · 1 GB = 1,000,000,000 bytes. A "1 TB" hard drive = exactly 1,000,000,000,000 bytes.
Binary (IEC) — used by operating systems
1 KiB = 1,024 bytes · 1 MiB = 1,048,576 bytes · 1 GiB = 1,073,741,824 bytes. Windows/macOS divide by 1,024 repeatedly.
Example: 1 TB drive step by step