Is this 1000 or 1024 based?

It uses 1024 (binary) steps, matching most operating systems.

Byte Size Converter

Convert between B, KB, MB, GB, TB and PB.

ValueUnit

B1,048,576

KB1,024

MB1

GB0.000977

TB0.000001

PB0

Uses binary (1024) steps.

Convert data sizes between bytes and larger units using 1024-based steps.

Is this 1000 or 1024 based?: It uses 1024 (binary) steps, matching most operating systems.
What's the largest unit?: Petabytes (PB).