What is a Data Size Converter?
Storage marketing uses decimal units (1 GB = 10⁹ bytes) while operating systems often report binary ones (1 GiB = 2³⁰ bytes) — which is exactly why a “1 TB” drive shows as 931 GB.
Enter a value in any unit and see it in every unit of both systems simultaneously.
How to use the Data Size Converter
- Enter a value.
- Pick its unit.
- Read the full conversion table across both systems.
Frequently asked questions
Why does my 1 TB drive show 931 GB?
The drive holds 10¹² bytes; your OS divides by 2⁴⁰ and calls it GiB (labeled GB). Both are “right” — the units differ.
KB vs KiB?
KB = 1000 bytes (decimal, SI); KiB = 1024 bytes (binary). The i marks the binary unit.
Which convention should I use?
Networking and storage sales: decimal. Memory and many OS displays: binary. When precision matters, write the unit explicitly.
How large can values be?
Anything sensible — very large or small values switch to scientific notation for exactness.