Data Storage Converter

Convert bytes, KB, MB, GB, and TB — and see why your 1 TB drive shows 931 GB.

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 new 1 TB drive shows about 931 GB.