Data size converter
Runs entirely in your browser. Your files and data never leave your device.
| Decimal (SI, ×1000) | ||
|---|---|---|
| Bits | 8000000 | |
| B | 1000000 | |
| KB | 1000 | |
| MB | 1 | |
| GB | 0.001 | |
| TB | 0.000001 | |
| PB | 0 | |
| EB | 0 | |
| Binary (IEC, ×1024) | ||
| B | 1000000 | |
| KiB | 976.5625 | |
| MiB | 0.953674 | |
| GiB | 0.000931 | |
| TiB | 0.000001 | |
| PiB | 0 | |
| EiB | 0 | |
About this tool
A data size converter takes one value, such as 500 MB or 2 TiB, and shows it in every common unit at once: bits, bytes, kilobytes, megabytes, gigabytes, and terabytes. It shows two versions of each unit side by side, decimal (KB, MB, GB, TB, based on powers of 1000) and binary (KiB, MiB, GiB, TiB, based on powers of 1024), so you can see exactly how far apart they are for the same amount of data.
Why do decimal and binary sizes disagree?
A “1 TB” hard drive uses the decimal definition: 1,000,000,000,000 bytes. Your operating system, though, often reports the same drive’s capacity using binary math, which is why it shows up as roughly 931 GiB instead of a clean 1000. Neither number is wrong. They’re just two different ways of counting the same bytes, and manufacturers and operating systems have historically picked different ones. The converter lays both scales side by side from bits up to exabytes, so you can enter a value in any unit and see it converted to every other one at once, including the underlying bit and byte totals.
How precise are the conversions?
The tool uses standard double-precision floating point math, the same kind built into every spreadsheet and calculator. That’s exact for values up to about 8 petabytes, and still accurate to several significant digits well beyond that. Numbers are shown as plain decimals rather than scientific notation, with trailing zeros trimmed so a round conversion like 1 GB reads as 1000 MB instead of 1000.000000.
Is my data uploaded anywhere?
No. The conversion is plain arithmetic that runs in your browser as you type, so file sizes, storage quotas, and bandwidth figures never leave your machine or touch a server.
Use it to check whether a download will fit on a drive, compare an ISP’s advertised speed in Mbps against your file size in MB, or figure out why a “512 GB” SSD shows less usable space in the OS. See the Wikipedia article on binary prefixes for the history of the KiB/MiB naming, or IEC 80000-13 for the standard that defines them.