Armour ratings

[Marcello]

If you are into the "do it by yourself" the formula for LOS thickness is: plate thickness/cosine of the angle (or the sine, depending on the convention you are following for measuring sloped armor).
Some examples:
1) T-34 glacis: 4.5cm/0.5 = 9cm = SPMBT value 9
2) T-62 glacis: 10.2cm/0.5 = 20.4cm = SPMBT value 20
3) Jagdpanther front superstructure: 8cm/0.57 = 14.04cm = SPMBT value = 14