Poker calculators
Seven tools covering all the maths around poker: bankroll, variance, pot odds, hand equity, fold equity and combinatorics. Every one of them runs straight in the browser with no sign-up, and under each is an explanation of how the sum is done by hand.
These are trainers for work away from the tables. Using assistance while you play is against the rules, and there is no need for it either: after some practice here all this arithmetic takes a couple of seconds in your head.
Before you play: bankroll and the long run
Planning with a clear head: what bankroll each stake requires and what will happen to it after a year of play. This is where you decide which stake can be profitable for you at all.
Bankroll
Is my bankroll enough for this stake?
Works out the minimum bankroll from your win rate, your variance and the risk of ruin you are willing to accept — separately for cash and tournaments. The answer comes in money and in buy-ins.
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Variance simulator
What does my year look like in numbers?
Monte Carlo over your tournament schedule: the profit distribution, how long downswings run, the risk of ruin and the bankroll it takes to survive them. There is a cash mode too.
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After you play: reviewing hands
The session is over, so you come back to the awkward spots with a calculator. Three of these tools work out the same bet-to-pot ratio from different sides of the hand: whether the odds cover a call, whether your bet generates enough folds, and how value and bluffs balance in your range. The fourth teaches you to plan bet sizes street by street so the line arrives where you want it. The fifth teaches you to think in ranges rather than single combinations. Reviewing hands regularly is what turns all this into mental arithmetic.
Outs and pot odds
Does calling with my draw pay off?
Exact odds of getting there from the flop and from the turn, the equity a call needs by pot odds, and the rule of 4 and 2 with its margin of error. Comes with a cheat sheet for the common draws.
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Fold equity
How many folds does my bet need?
How often your opponent has to fold for the bet to pay for itself. Three tabs: a pure bluff, a semi-bluff with a draw, and raising someone else's bet. Plus MDF, the bluff share and a mini drill.
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Value and bluffs
Is my betting range balanced?
Turns your sizing into a value-to-bluff ratio: how many bluff combos to add to your value hands — or how much value to keep for each bluff.
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Line planner
What will the pot be by the river?
Set your flop, turn and river sizings and see the final pot, everything the line costs you, and the folds each street demands.
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Combinatorics
How many combos does my opponent have on this board?
A 13×13 grid, the board and your own cards: how many combos of the range survive, and which of them are made hands, draws or air. Blockers included.
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Where to start
If you are opening these pages for the first time, this is the order. Start with the bankroll — it decides which stake you can beat over the long run at all. Then outs and pot odds: the most frequent arithmetic in a hand — whether the odds justify paying for the card. And only then fold equity — the same fraction read from the side of the player doing the betting.
Three of the pages carry mini drills: a spot, your answer and the working step by step. That is what the calculator is for — training the arithmetic until, at the table, it is a skill you apply without thinking.
The terms and the theory behind the formulas are covered in the poker ABC.