Data Storage Size Converter

Convert bytes, KB, MB, GB, TB, PB — binary (1024) or decimal (1000).

Stays on your device. This tool runs in your browser — nothing you paste or open ever leaves it. Nothing uploaded, nothing to leak.

Binary (1 KB = 1024 B) — uncheck for decimal (1000)

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How to use it

Enter an amount, choose the unit you have and the unit you want, and the result updates instantly. Use the ⇄ button to swap the two units. Toggle Binary off for decimal (SI) units.

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A data size converter changes a value from one storage unit to another — bytes, kilobytes, megabytes, gigabytes, terabytes and petabytes. Switch between binary (1 KB = 1024 bytes, how operating systems count) and decimal (1 KB = 1000 bytes, how drives are sold). It runs in your browser.

Binary vs decimal

Operating systems usually count in binary — 1 KB = 1024 bytes — while storage makers advertise in decimal — 1 KB = 1000 bytes. That is why a “1 TB” drive shows as roughly 931 GB in your OS. This tool does both so you can reconcile the two.

FAQ

Why does my drive show less space than advertised?Drives are sold in decimal (1000) units but your OS reports in binary (1024), so a 1 TB drive shows about 931 GiB. Toggle the modes here to see both.

Which mode should I use?Binary (1024) matches what Windows, macOS and Linux report; decimal (1000) matches drive marketing and network speeds.

Is anything uploaded?No — it converts entirely in your browser.