Shows both decimal and binary-style reference units where useful.
Data & storage
Data Storage Converter
Convert GB, TB, PB and TiB so you can compare cloud storage, drives and server space without guessing.
Short answer: 1 TB is 1,000 GB and 1 PB is 1,000 TB. 1 TiB (a tebibyte) is slightly bigger, exactly 1,099.51 GB.
Decimal versus binary
Drive makers use decimal units. Many operating systems count in binary and still write “GB” or “TB” when they really mean GiB or TiB. That is why a 1 TB drive shows up as roughly 931 in the file manager. The calculator shows both so you can compare like with like.
Where it helps
- Comparing cloud storage plans (2 TB versus 5 TB)
- Planning a NAS or server purchase
- Checking how much of a drive you will really get
Example
A 4 TB drive is 4,000 GB in decimal. In binary units that is about 3.64 TiB, which is why your system may say 3.6 TB free on a fresh disk.
Smaller numbers? Use the File Size Converter.
FAQ
Frequently asked questions about the Data Storage Converter
How many GB are in 1 TiB?
1,099.51 GB.
Is a TB bigger than a TiB?
No. A TiB is about 10% bigger than a TB.
How many TB in a PB?
1,000 TB.
Why does Windows show less space than the label says?
It counts in binary units but labels them as GB or TB. The drive is fine.
KEEP GOING
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Use this toolResults are estimates for planning. Last reviewed 2 October 2026.