Conversions
Data size converter
Storage makers count in powers of 1,000 and many operating systems count in powers of 1,024. This converter keeps both standards apart so you can see why a 1 TB drive shows less space.
What this means
- 1 TB is 931.32257462 GiB.
- 1 TB = 931.32257462 GiB.
- Factors are exact definitions where one exists, so results are as precise as the display allows.
What if
About this calculator
What this calculator does
It converts between units by going through one base unit, the byte. Every unit has a fixed factor to the base.
How it is calculated
result = value * (factor of From) / (factor of To)
Decimal (SI) units: 1 KB = 1,000 bytes, 1 MB = 1,000,000 bytes. Binary (IEC) units: 1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes. A byte is 8 bits.
How to read the result
The main result is rounded for display to at most eight decimal places. The other-units line shows the same value in several common units at once.
Sources and method
Decimal units use powers of 1,000 and binary units use powers of 1,024, following the SI and IEC prefix conventions. Unit tests check both.
This page uses arithmetic only, with no outside data.
Questions
Why does my 1 TB drive show about 931 GB?
The drive is 10^12 bytes. Many systems divide by 1,024 three times and label the result GB, which is really GiB. 1 TB is about 931.32 GiB.
How many MB are in a GB?
1,000 in decimal units. 1 GiB is 1,024 MiB.
What is the difference between Mb and MB?
Mb is megabits and MB is megabytes. A byte is 8 bits, so 100 Mb is 12.5 MB.
Which standard is correct?
Both are standards. KB, MB, and GB are decimal. KiB, MiB, and GiB are binary.