Tools & data

Calculators that show the real price.

Free to use with no sign-up. Every tool runs in your browser, so you get results instantly.

Blackjack tools

Chart, house edge and true count.

The three tools that matter most for blackjack. The chart comes from the same engine as the drill table and Ace, so all three always agree.

Basic strategy chart

6 decks, dealer stands on soft 17, double after split allowed. Tap any cell to see why.

You	2	3	4	5	6	7	8	9	10	A
Hard totals
5	H	H	H	H	H	H	H	H	H	H
6	H	H	H	H	H	H	H	H	H	H
7	H	H	H	H	H	H	H	H	H	H
8	H	H	H	H	H	H	H	H	H	H
9	H	D	D	D	D	H	H	H	H	H
10	D	D	D	D	D	D	D	D	H	H
11	D	D	D	D	D	D	D	D	D	H
12	H	H	S	S	S	H	H	H	H	H
13	S	S	S	S	S	H	H	H	H	H
14	S	S	S	S	S	H	H	H	H	H
15	S	S	S	S	S	H	H	H	H	H
16	S	S	S	S	S	H	H	H	H	H
17+	S	S	S	S	S	S	S	S	S	S
Soft totals
A,2	H	H	H	D	D	H	H	H	H	H
A,3	H	H	H	D	D	H	H	H	H	H
A,4	H	H	D	D	D	H	H	H	H	H
A,5	H	H	D	D	D	H	H	H	H	H
A,6	H	D	D	D	D	H	H	H	H	H
A,7	S	D	D	D	D	S	S	H	H	H
A,8	S	S	S	S	S	S	S	S	S	S
A,9	S	S	S	S	S	S	S	S	S	S
Pairs
2,2	P	P	P	P	P	P	H	H	H	H
3,3	P	P	P	P	P	P	H	H	H	H
4,4	H	H	H	P	P	H	H	H	H	H
5,5	D	D	D	D	D	D	D	D	H	H
6,6	P	P	P	P	P	H	H	H	H	H
7,7	P	P	P	P	P	P	H	H	H	H
8,8	P	P	P	P	P	P	P	P	P	P
9,9	P	P	P	P	P	S	P	P	S	S
10,10	S	S	S	S	S	S	S	S	S	S
A,A	P	P	P	P	P	P	P	P	P	P

H HitS StandD Double (if not allowed: hit, or stand on soft 18)P Split

Tap a cell to see the reasoning.

House edge calculator

Change the table rules and see how much each one costs you. Assumes perfect basic strategy.

Decks

Dealer on soft 17

Blackjack pays

Double down on

Double after split

Late surrender

Re-split aces

Approximate. Each figure comes from standard rule-effect tables and starts from a baseline of about 0.42% (6 decks, S17, DAS, 3:2). Real games can differ by a few hundredths of a percent.

True count calculator

Hi-Lo running count divided by the decks left to play. Counting in your head is legal in the US and UK, though casinos can refuse to deal to you.

Running count

Decks remaining

Rule of thumb: each +1 of true count moves the edge about 0.5% towards the player, starting from about −0.5% at a count of 0. Real results swing a lot, and no count guarantees a profit.

Betting maths

Odds, vig and parlays.

Odds converter

Enter American (+150), decimal (2.50) or fractional (3/2) odds.

Decimal–

Fraction–

Implied–

Vig calculator

Enter both sides of a two-way market to see the bookmaker's margin and the fair odds.

Side A

Side B

Parlay calculator

Add each leg's odds. You'll see the payout, plus the true win chance once the bookmaker's margin is removed from every leg.

Stake ($)

Margin per leg (%)

The house edge meter

Every game has a price. Here's what each one costs.

Pick a game and set your total wagered. The number shows what you should expect to lose on average over the long run.

Blackjack (basic strategy)

Expected cost on

$1,000total wagered

Expected loss

Bankroll simulator

Run 500 sessions in about a second and see where your money goes.

This is a Monte Carlo simulation. Each line on the chart is a possible future. Short-run luck varies a lot, but the house edge always wins over time.

Median10th–90th percentileStart

Ended up–

Busted–

Median end–

Safer play studio

No strategy guarantees profit. Plan your limits first.

Set a budget and a time limit before you play anywhere, then stick to both.

Budget planner

Monthly entertainment budget ($)

Sessions per month

Per-session limit

$37.50

Reality-check timer

Start this when you start a session anywhere. We'll remind you to stop at your limit.

00:00

Need to talk?

If gambling has stopped being fun, free and confidential help is available 24/7.

US: 1-800-GAMBLER
UK: 0808 8020 133

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