# Probability formula for blackjack

Find the probability of flipping exactly two heads on 3 coins. So to figure out this probability, a good place to start is just to think about all of the different possible ways that we can flip 3 coins. So we could get all tails. Tails, tails, tails. We could get tails, tails, heads. We could get ...

The equation assumes an even-money payoff, which is not always the case in blackjack (due to doubling down, pair splitting, and 3-2 payoffs for a blackjack). However, for many reasonable numbers of units of bank, it gives a close approximation of the probability of doubling a bankroll vs. going broke.

If you stand on 21, your expected win = the probability of the dealer getting 17 through 20 or busting; if you hit 21, your expected win = 1/13 x (your expected win with 22) + 1/13 x (your expected win with 23) + ... + 4/13 x (your expected win with 30).

The proven formula of blackjack basics is simple: practice and repetition. All card counting systems and blackjack strategy charts in the world can’t help you when you run out of time. And advanced card counting strategies rely on a running count, so if you forget where you’re at, you’ll have to wait until all of the decks in the shoe have been dealt. This article describes the formula syntax and usage of the PROB function in Microsoft Excel. Description. Returns the probability that values in a range are between two limits. If upper_limit is not supplied, returns the probability that values in x_range are equal to lower_limit. Syntax. PROB(x_range, prob_range, [lower_limit], [upper_limit]) The formula is basically as follows: f = (bp-q)/b. f = the portion of the player’s bankroll they should wager on each bet. b = the odds the player is receiving on each wager (b to 1). p = the probability of winning the wager. q = the probability of losing the wager.