What is the difference between KB and KiB?

1 KB (Kilobyte) is 1,000 bytes. 1 KiB (Kibibyte) is 1,024 bytes. Windows uses KiB but labels it "KB".

Why is my 1TB drive showing as 931GB?

Drive makers use decimal TB (1,000,000,000,000 bytes). Computers read binary TiB (1,099,511,627,776 bytes). 1 TB ≈ 0.909 TiB.

Convert between KB, MB, GB, TB and more with support for both base-2 (binary) and base-10 (decimal) unit systems.

Base-2 (Binary) Conversion

Base-10 (Decimal) Conversion

Bytes to KB/MB/GB/TB

KiB/MiB/GiB/TiB Support

Petabyte Conversion

Enter Value: Type a number into any field (e.g., "1" in Gigabytes).
Switch Systems: Toggle between "Base-2 (Binary)" or "Base-10 (Decimal)" tabs to see different standards.
Instant Results: All other fields update automatically to show the equivalent value.
Copy: Click the copy icon next to any result to save it to your clipboard.

Storage Planning: Calculate exactly how many files will fit on a drive.
Debugging: Resolve "not enough space" errors by understanding the KiB vs KB discrepancy.
Education: Learn the difference between binary (1024) and decimal (1000) prefixes.