Data size converter.

Convert a size between decimal units (powers of 1000) and binary units (powers of 1024), and compare both results side by side.

The same size, two definitions

Almost every “missing space” mystery and surprise bandwidth bill traces back to one fact: a GB can mean 1,000,000,000 bytes or 1,073,741,824 bytes depending on who is counting. Storage vendors and network bills use decimal; operating systems and RAM use binary but often borrow the decimal label. The gap is about 7% at GB and grows with scale. Seeing both columns at once turns a confusing discrepancy into an obvious, expected one — and reminds you to write GiB when you mean GiB.