File Size Converter
Convert between B, KB, MB, GB, TB (and their binary KiB/MiB cousins).
How to Use
- Type a number in any row.
- All others update live.
- Decimal (KB=1000) and binary (KiB=1024) shown separately.
Decimal (SI)
Binary (IEC)
Reference
KB
1000 B (SI)
KiB
1024 B (IEC)
MB vs MiB
~4.9% diff
GB vs GiB
~7.4% diff
Byte
8 bits
Data rate
Mbps vs MBps (÷8)
Frequently Asked Questions
KB or KiB?
Drives/manufacturers use KB=1000. Operating systems typically use KiB=1024 but mislabel it "KB".
Common Use Cases
Bandwidth
Plan transfer sizes.
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