Bytes to mb: Is there any way

Is there any way to find out how much free space is left in a tablespace? After some research (I am not a DBA), I tried the following: select max_bytes- bytes from user_ts_quotas; select sum(nvl( bytes ,0)) from user_free_space; but those queries return completely different results. 1KB表示1K个Byte，也就是1024个字节。 MB：计量单位中的M (兆)是10的6次方，见到M自然想起要在该数值的后边续上六个0，即扩大一百万倍。 在二进制中，MB也表示到了百万级的数量级，但1MB不正好等于1000000字节，而是1048576字节，即 1MB = 2E+20 Bytes = 1048576Bytes。 @fiat in case someone decides to give the UnitsNet package a try, there's the Information class that implements the FromBytes method, which allows you to convert from bytes to another unit, e.g. double result = Information.FromBytes(1547821).Megabytes; => this will return 1.547 ( MB ). I got this code to covert size in bytes via PHP. Now I want to convert those sizes to human readable sizes using JavaScript. I tried to convert this code to JavaScript, which looks like this: fun...