How many bytes are in 1 packet?

Answer 1

I found an answer to this question:

I downloaded a file and then compared the download rate shown in the Download dialog box with the packet received rate shown in the Local Area Connection dialog box. On my computer 1 MB downloaded equated to @ 1000 packets received. In this case one packet = @1000 bytes.

Note: My connection speed is 100.0 Mbps

Answer 2

1 packet contain 1 byte or 8 bit

That answer may be true or not depending on what type of 'packet' you are asking about.

In telecommunications the packet size can vary according to the protocol in use. If I remember correctly a packet size of around 512 bytes is commonly used over Ethernet based networks.