In war
The sum of the deck is worth 416 this is because

2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
J = 11
Q = 12
K = 13
A = 14

So if you add all those together you get 104 which is the sum of one suit. Since theirs 4 suits in a deck you multiply it by 4 and you get 416, the sum of the deck.

The game ends when one player's deck is the sum of 416 and their opponents is 0.

However when you break down the mathematics of war into simple number it quickly becomes apparent that the game is ENTIRELY predetermined since the players draw all the cards from the TOP of the deck. Providing if player 1's cards are always added before player 2's card to the bottom of the winners stack or vise versa the game will remain predetermined. It changes when the cards are readded to the deck in a different order.