Decimal and binary units
The default calculator uses decimal units: each step is 1,000. Storage labels on drives and many download sizes use this system.
Binary units use 1,024. Switch to Binary units to calculate KiB, MiB, GiB, and TiB. The result always stays inside the system you selected.
This is not an upload tool
Nothing is uploaded because no file is required. The page multiplies and divides the number you type.