Trafficdata from RRDDATA

Hello,

how can I format the trafficdata (netin/netout) from the rrddata via api2 (for example: https://123.123.123.123:8006/api2/js...timeframe=hour) to a real format?
So in megabyte or gigabyte. If I simply expect the values ​​by 1024 I'm on totally incorrect values​​.

Thanks! :-)