Data Size Converter
Convert between bytes, KB, MB, GB, and TB.
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About the Data Size Converter
Convert file and storage sizes free — bytes to MB, MB to GB, KB to MB, and up through TB and PB — with a toggle between binary (1024, how your OS counts) and decimal (1000, how drives are sold). That toggle answers the eternal question of why a “1 TB” drive shows up as ~931 GB. Useful for storage planning, upload limits, and bandwidth math.
How to use the Data Size Converter
- 01Enter a value and its unit.
- 02Toggle binary (1024) or decimal (1000).
- 03Read every unit and copy what you need.
Frequently asked questions
Binary or decimal — which should I use?
Operating systems usually report storage in binary (1 KB = 1024 B); drive manufacturers use decimal (1 KB = 1000 B).
Why is my drive smaller than advertised?
Because manufacturers count in decimal while your OS counts in binary, so a “1 TB” drive shows as ~931 GB.
How many MB in a GB?
1,000 MB in decimal (how storage is sold) or 1,024 MiB in binary (how your OS usually counts). This tool shows both.