Why does my 1TB hard drive only show 931GB in Windows?

Hard drive manufacturers market in decimal base (1,000,000,000,000 bytes = 1TB), while Windows calculates file systems in binary base (1024^3), yielding ~931 GiB.

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File Size Converter

Convert data storage units between Bytes, KB, MB, GB, TB, and binary IEC units.

How to Use File Size Converter

1Enter a numeric file size amount.
2Select the starting unit (Bytes, KB, MB, GB, TB).
3Choose calculation base: Binary (1024) or Decimal (1000).
4View instant conversion across all storage units.

Key Features & Benefits

Converts across Bytes, KB, MB, GB, TB, and PB
Toggle between Binary (1024 KiB/MiB) and Decimal (1000 KB/MB)
High-precision output with clean copying
Real-time calculations as you type

About File Size Converter

Data storage calculator. Convert between Bytes, Kilobytes, Megabytes, Gigabytes, Terabytes, and Petabytes in both decimal (base 1000) and binary computer memory (base 1024 / KiB, MiB).

Unlike traditional web tools that send your personal data, uploaded photos, or sensitive text to remote cloud servers, our File Size Converter operates strictly inside your client browser sandbox. This guarantees high processing speeds without network throttling, and ensures your data privacy is completely preserved.