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Data Storage Converter

Why is your 1 TB drive showing 931 GB? Convert decimal and binary units here.

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MB to GBGB to MBGB to TBGB to GiB

GB versus GiB

Drive makers use decimal units (1 GB = 1,000,000,000 bytes). Windows reports sizes in binary units (1 GiB = 1,073,741,824 bytes) but labels them GB, which is why a 1 TB drive appears as 931 GB.

Frequently asked questions

How many MB in a GB?

1,000 MB (decimal) or 1,024 MiB in a GiB (binary).

Why does my 1 TB drive show 931 GB?

Because 1 TB (decimal) is 931 GiB (binary), which Windows labels GB.