KB is 1,000 bytes; KiB is 1,024. They diverge as they grow — a 1 TB drive holds about 931 GiB, and that missing 7 per cent is arithmetic rather than a defect.

Byte Size Converter

Convert between bytes, KB/MB/GB and KiB/MiB/GiB.

Loading tool…

About this tool

Converts between byte units in both the decimal family, where a kilobyte is 1,000 bytes, and the binary family, where a kibibyte is 1,024. Storage vendors use the first and operating systems often use the second, which is why a new drive always looks smaller than the box promised.

Limitations

Decimal units are powers of 1000; binary units are powers of 1024. Both are shown because vendors disagree.

Questions

KB or KiB?: KB is 1,000 bytes; KiB is 1,024. They diverge as they grow — a 1 TB drive holds about 931 GiB, and that missing 7 per cent is arithmetic rather than a defect.

Privacy

This page does its work in your browser. What you paste is processed by JavaScript running on your own device and is never sent to a DevToolery server — there is no server that could receive it. The page itself is a static file delivered by a CDN. See exactly what is stored.