ArmourCalc is a very straightforward program. 

Enter the armour thickness in millimetres then the angle of the armours slope then press calculate 
and the answer is displayed in the Result box. To use that in the game round down any result under 5. 
For example , a result of 105mm would equal 11 in the game and a result of 104 would equal 10.

We DO NOT recommend the initial value be entered as centimetres already rounded up or down as this can skew the final result

Examples 

101mm of armour at 45 degrees = 143mm . That would translate to an armour rating of 14 in the game.

105mm of armour at 45 degrees = 148mm or 15 cm in game terms. 
