Maths
Rule of two and four in poker
Multiply outs by four with two cards to come, or by two with one, to estimate equity.
A shortcut for turning outs into equity at the table.
With two cards to come, multiply your outs by four. With one card to come, multiply by two. Nine outs on the flop gives an estimate of 36%; the exact figure is 35.0%. Nine outs on the turn gives 18%; the exact figure is 19.6%.
The approximation drifts upward as the number of outs grows, with 15 outs it overstates flop equity by about six points, so treat it as a fast sanity check rather than a precise answer. For a close decision, use the calculator.
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