Do you have the odds to call with a flush draw?

A flush draw has 9 outs: 19.1% on the turn, 19.6% on the river, and 35.0% by the river when both cards are guaranteed.

9 Outs

19.1% Hit on the next card (flop)

19.6% Hit on the river (turn)

35.0% By the river, both cards guaranteed

Table shortcut, outs × 2 for each card you see: 9 × 2 = 18% for a one-card call, and 9 × 4 = 36% when this flop call guarantees both cards. Both land within 1.6 points of the exact 19.1% and 35.0%, close enough to use at the table.

One-card direct odds assume you fold after a miss and pay no further bets. Use by-the-river odds when this call guarantees both cards, such as an all-in or a guaranteed free river.

Nine cards complete your flush. If you fold after a miss and pay no later bets, price the turn card. The turn completes it 9 times in 47, 19.1%, so on direct odds a flush draw can call about a third of the pot. The 35.0% you see quoted is the chance of hitting by the river, and prices a call that guarantees both cards, such as an all-in or a free river. On the turn the river hits 19.6% of the time, the same price problem again. Calling bigger bets is about implied odds: how much more you win when the flush comes in.

On one-card direct odds, 9 outs can call a bet up to about 31% of the pot on the flop and up to about 32% of the pot on the turn on direct odds alone. When a flop call guarantees both cards, including all-in or a free river, both cards count, and then 9 outs can call a bet up to about 1.2x the pot. Anything bigger has to be paid back by what you win when you hit.

Quick tip: A flush draw hits the next card 19.1% of the time. Without implied odds it calls about a third of the pot, not a pot-sized bet.