number

    Specifies a 32-bit (or smaller) number to convert.

 from-units

    Specifies the unit of measure from which to convert. When only
    first argument is present, the default option for this field is
    BLOCKS. Supported options for this field are BLOCKS, B, KB, MB,
    GB, and TB.

 to-units

    Specifies the unit of measure to which to convert. When only
    first argument is present, or the second argument is BLOCKS,
    the default option for this field is BYTES and the result gets
    rounded off to appropriate "to-unit". Supported options for this
    field are BLOCKS, BYTES, B, KB, MB, GB, and TB. Keyword "BYTES"
    is supported only for BLOCKS to BYTES conversion.