How many bytes in a packet?

Sometime, we found some devices that point out "forwarding rate, Mpps". The "pps" is the short term for packet per second. However, how many bytes in a packet? It depends, there is no specification on how many byte in a packet, you define it by yourself.

In the 100M Ethernet network,
100M bps / 8 = 12.5 MBps = 12500000 Bytes/s(Bps)

If you define the frame size is 64 Bytes (Minimum Ethernet framz size):
8 Bytes (preamble) + 64 Bytes + 12 Bytes (interframe gap) = 84 Bytes

So forwarding rate will be
12500000 Bps / 84 bytes = 148809 pps

If you define the frame size is 1518 Bytes (Maximum Ethernet framz size):
8 Bytes (preamble) + 1518 Bytes + 12 Bytes (interframe gap) = 1538 Bytes

So forwarding rate will be
12500000 Bps / 1538 bytes = 8127 pps

100M Ethernet's forwarding rate formula:
12500000 Bps / ( 8 Bytes (preamble) + (Feame Size) + 12 Bytes (interframe gap)) = forwarding rate, pps