If I have 700 MB how many GB is that?

There are less than one gb in 702mb because you need a 1000MB to make 1 GB.

BUT

{{Technically, there are 0.68555 gb in 702 mb}}

using the chart below

1 Byte = 8 Bit

1 Kilobyte = 1024 Bytes

1 Megabyte = 1048576 Bytes

1 Gigabyte = 1073741824 Bytes