Data Size Converter

The Data Size Converter changes a quantity of data from one unit to another and makes the most confusing part of the job explicit: whether a "kilobyte" means 1000 bytes or 1024.

It supports decimal SI units (B, KB, MB, GB, TB, PB), which step by powers of 1000, and binary IEC units (KiB, MiB, GiB, TiB, PiB), which step by powers of 1024.

That distinction is the source of endless confusion.

Storage manufacturers advertise a 1 TB drive using decimal terabytes, while many operating systems report capacity in binary units — which is exactly why a "1 TB" disk shows up as roughly 931 GiB.

Memory, file sizes and network speeds each tend to follow their own convention.

By labelling both families clearly and letting you convert freely between them, this tool lets you reconcile the numbers instead of guessing.

Enter a value, choose the unit you have and the unit you want, and the converted figure appears instantly.

Cross-family conversions — say KiB to MB — are handled correctly by routing everything through bytes.

The calculation is pure and runs entirely in your browser, so there is nothing to upload and it works offline.

It is a quick, dependable answer whenever the difference between a megabyte and a mebibyte actually matters.