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Also question is, what is the average packet size?

The average size of the packet would depend on the application. @DrZoo is largely right - a typical packet on the internet is 1476 - 1500 bytes, however bigger or smaller packets are possible. This answer does not take into account when a small amount of data is sent in a packet - for example in a chat session.

One may also ask, what is in a packet? Packet. A packet is a small amount of data sent over a network, such as a LAN or the Internet. Similar to a real-life package, each packet includes a source and destination as well as the content (or data) being transferred.

Furthermore, how do you calculate packet size?

The IP header has a 'Total Length' field that gives you the length of the entire IP packet in bytes. If you subtract the number of 32-bit words that make up the header (given by the Header Length field in the IP header) you will know the size of the TCP packet.

Is MTU a packet size?

A maximum transmission unit (MTU) is the largest packet or frame size, specified in octets (eight-bit bytes) that can be sent in a packet- or frame-based network such as the internet. The internet's transmission control protocol (TCP) uses the MTU to determine the maximum size of each packet in any transmission.