Data Size Converter
Type a number once — see it in every data unit, decimal and binary, instantly.
Enter a number to see it in every unit.
All units at once
| Bit (b) | — |
| Byte (B) | — |
Decimal (SI, 1000) vs Binary (IEC, 1024)
| Decimal (SI · ×1000) | Binary (IEC · ×1024) |
|---|---|
| kB— | KiB— |
| MB— | MiB— |
| GB— | GiB— |
| TB— | TiB— |
| PB— | PiB— |
자주 묻는 질문
MB to GB — is it 1000 or 1024?
Both are used, which is exactly the confusion this converter clears up. In the decimal SI system (used by drive makers, networks and most marketing), 1 GB = 1000 MB and 1 MB = 1000 kB. In the binary IEC system (used by Windows and RAM), the correct names are KiB, MiB and GiB, where 1 GiB = 1024 MiB. So 1 GB (decimal) = 0.9313 GiB (binary). This tool shows both columns side by side so you never have to guess which one a number means.
Why does my 1 TB drive show as only ~931 GB?
Because the drive maker counts in decimal (1 TB = 1,000,000,000,000 bytes) while your operating system divides by 1024 and still labels the result "GB". 1 TB = 1000 GB in decimal, but only 0.9095 TB when measured in binary tebibytes — that is 931.32 GiB, which Windows displays as "931 GB". No space is missing; the two systems just count differently. Type 1 and pick TB to see the TiB / GiB figure instantly.
Megabit (Mb) vs megabyte (MB) — what is the difference?
One byte is 8 bits, so a megabyte is 8× a megabit. Internet speeds are quoted in megabits per second (Mbps), while file sizes and download managers use megabytes (MB). That is why a 100 Mbps connection tops out around 12.5 MB/s. Enter a value with the bit unit selected to convert between the two and avoid the 8× trap.
How precise are the results?
Every conversion keeps up to 10 significant figures, then trailing zeros are trimmed for readability. Very large or very small numbers (roughly 1e15 and above, or below 1e-9) switch to scientific notation, so nothing is silently rounded away to zero. All values come from the exact byte definition of each unit — decimal units are powers of 1000, binary units are powers of 1024.
Is my input sent to a server?
No. This data size converter runs entirely in your browser — the number you type is never uploaded anywhere. The only thing saved is your last chosen unit pair (for example MB → GB), kept in your browser's local storage so it is ready next time. The value itself is not stored.