$1 \text{ GB} = 1024 \text{ MB}$. Digital storage units follow powers of 2: $1 \text{ KB} = 1024 \text{ bytes}$, $1 \text{ MB} = 1024 \text{ KB}$, $1 \text{ GB} = 1024 \text{ MB}$, $1 \text{ TB} = 1024 \text{ GB}$. These binary multiples are used because computers operate in base-2 (binary).