Bytes Converter
Bytes, kilobytes, megabytes, gigabytes, terabytes.
Hard drives use decimal (1 GB = 1,000,000,000 bytes). Operating systems often use binary (1 GiB = 1,073,741,824 bytes). That is why your “1 TB” drive shows as 931 GB.
About
Type any value and unit. See the same value in every common storage unit, both decimal (1 KB = 1,000 B) and binary (1 KiB = 1,024 B). Both conventions are used in the wild and they disagree by a few percent at GB scale.
How to use
- Type a value.
- Pick the source unit.
- Read every unit on both scales.
FAQ
Why do my hard drive's stated size and Windows disagree?+
Drive manufacturers use decimal (1 TB = 10^12 bytes). Windows reports binary (1 TiB = 2^40 bytes). A '1 TB' drive shows as 931 GiB. Same bytes, different label.
Which one is 'correct'?+
Both are. The IEC standardized binary suffixes (KiB, MiB, GiB) in 1998, but most software still says 'GB' when it means 'GiB'. Treat the difference as a 7% rule of thumb at TB scale.