Blackjack Datasets
We publish the numbers behind this site as free, machine-readable datasets so anyone — students, researchers, developers, writers — can use them. Everything here is computed by our own odds model (deterministic, with documented approximations) and released under a CC BY 4.0 license: reuse it however you like, just credit Blackjack Odds Trainer with a link back.
Expected value by hand, action & rule
Our flagship dataset: the modeled EV of every action (stand, hit, double, split) for every starting hand — hard totals, soft hands, and pairs — against every dealer up-card, across five deck counts and both soft-17 rules. It also gives the best play and its EV per row. This is the full data behind our EV heatmap, but parameterized by rules.
Columns: decks (1/2/4/6/8) · dealer_rule (H17/S17) · category (hard/soft/pair) · hand · dealer_upcard (2–A) · stand_ev · hit_ev · double_ev · split_ev · best_action (S/H/D/P) · best_ev. All EV columns are in cents won or lost per $1 of the original bet — e.g. -54.0 means you lose 54¢ on the dollar. Double and split EVs already account for the extra money wagered; split_ev is blank for non-pairs.
| decks | rule | hand | vs | stand | hit | double | best |
|---|---|---|---|---|---|---|---|
| 6 | H17 | 16 | 10 | −54.2 | −53.5 | −106.9 | H |
| 6 | H17 | 11 | 6 | −12.4 | +33.9 | +67.8 | D |
| 1 | H17 | 11 | 6 | −10.1 | +37.5 | +74.9 | D |
| 6 | S17 | A,7 | 2 | +11.8 | +3.9 | +9.9 | S |
Preview — the file has all 3,300 rows. The interactive version is the EV chart (with an H17/S17 toggle) and the count-adjusted heatmap.
Dealer outcome distribution
The modeled probability the dealer finishes on each total (17–21) or busts, by up-card, across five deck counts and both soft-17 rules, for a US-peek game. 100 rows.
Columns: decks · dealer_rule · dealer_upcard · 17_percent … 21_percent · bust_percent. Values are percentages.
| decks | rule | up-card | 17 | 18 | 19 | 20 | 21 | bust |
|---|---|---|---|---|---|---|---|---|
| 6 | H17 | 6 | 11.5 | 11.5 | 11.5 | 11.0 | 10.6 | 43.9 |
| 6 | H17 | 10 | 12.1 | 12.1 | 12.1 | 37.1 | 3.7 | 23.0 |
| 6 | H17 | A | 8.3 | 20.7 | 20.7 | 20.7 | 9.6 | 20.1 |
Preview. The interactive version with charts is on the dealer bust odds page.
Blackjack payout table
Payout amounts for the common outcomes — a 3:2 and 6:5 blackjack (net and total return), a regular 1:1 win, a won double, a surrender return, and insurance cost — across a range of bet sizes. 10 rows.
Columns: bet · blackjack_3_to_2_net · blackjack_3_to_2_total_return · blackjack_6_to_5_net · blackjack_6_to_5_total_return · regular_win_net · won_double_net · surrender_return · insurance_cost.
How to cite & reuse
These datasets are free under Creative Commons Attribution 4.0. Use them in articles, videos, apps, research, or anywhere else — the only ask is a credit and a link, for example:
Blackjack Odds Trainer, "Blackjack Datasets" (v1.0, 2026). blackjackoddstrainer.com/data/ — CC BY 4.0.
Method & limitations
The figures are modeled, not simulated: a deterministic combinatorial model computes the dealer's outcome distribution and the value of each play. It is not a full finite-shoe solver — future draws use fixed shoe proportions and split valuation is approximate — so treat the numbers as accurate to a fraction of a percent, not exact to the last cent. The full method, assumptions, validation checkpoints, and known approximations are documented on the methodology page. Version history and corrections are noted there and on the About page. Found an error? Please tell us — the correction process is public.