Data Size Converter
Convert digital storage sizes — decimal (KB=1000 B) and binary (KiB=1024 B) units side by side.
Decimal (SI)
KB: 1,000,000
MB: 1,000
GB: 1
TB: 0.001
Binary (IEC)
KiB: 0.001
MiB: 0
GiB: 0
TiB: 0
Formula
1 GB = 10⁹ bytes; 1 GiB = 2³⁰ bytes = 1.073741824 GBHow to use the Data Size Converter
- 1Enter a size and pick a unit
- 2Read the decimal (SI) conversions
- 3Compare with binary (IEC) units
Frequently Asked Questions
Why does my 1 TB drive show 931 GB?
Drive makers use decimal TB (10¹² bytes) while Windows displays binary TiB. 1 TB = 0.909 TiB ≈ 931 'GB' in Windows.
What's the difference between MB and MiB?
MB = 10⁶ bytes (SI), MiB = 2²⁰ bytes (IEC) ≈ 1.048576 MB. Marketing uses MB; operating systems often use MiB.