According the frame format of Ethernet
Minimum Frame Size should be :
7Bytes + 1Bytes + 6Bytes + 6Bytes + 2Bytes + 46Bytes +4Bytes = 72Bytes
Maximum Frame Size should be :
7Bytes + 1Bytes + 6Bytes+ 6Bytes + 2Bytes + 1500Bytes + 4Bytes = 1526Bytes
But it is said that the minimum frame size is $64Bytes$ while the maximum frame size is $1518 Bytes$.
How the frame sizes are calculated ?