Odds of Flopping a Flush: 0.84% — Every Flush Number That Matters

The exact math

With two suited hole cards, 11 cards of your suit remain among the 50 unseen. A flopped flush needs all three flop cards from those 11: C(11,3)/C(50,3) = 165/19,600 = 0.842%. The full picture across the hand:

• •Flop a flush: 0.84% — 1 in 119.
• •Flop a flush draw (exactly two of your suit): C(11,2) x 39 / 19,600 = 10.94% — 1 in 9.
• •Flop exactly one of your suit (backdoor territory): 41.6%.
• •Make a flush by the river (three or more of your suit across all five board cards): 6.40% — 1 in 15.6.

How often the draw gets there

Flopping the draw is the common case, so the completion numbers matter more than the flop-a-flush number: from the flop with 9 outs and two cards to come, the flush completes 35.0% of the time (1 − 38/47 × 37/46); from the turn with one card to come, 19.6% (9/46). The rule of 4 estimates 36% — close enough for the table. Two warnings the raw numbers hide: with 4-to-a-flush on board, everyone plays scared and your implied odds shrink; and a non-nut flush that completes can cost you a stack against the ace-high version — flush-over-flush lands somewhere at a 9-handed table about 1 in 583 deals (computed on our odds hub).

What 'suited' is really worth

Players massively overrate suitedness because flushes are memorable. From our preflop equity dataset (300k Monte Carlo trials per matchup with the site evaluator): A-K suited has 67.2% equity against one random hand versus 65.3% for A-K offsuit — suitedness is worth about 2 percentage points heads-up. It's real value, mostly from the 6.4% river-flush chance plus playability (a 10.9% chance of flopping a strong draw you can semi-bluff), but it doesn't rescue bad hands: Q-4 suited is still a fold nearly everywhere. 'Any two suited' costs money precisely because 93.6% of the time, the flush never arrives.

Play the draw, not the dream

The practical hierarchy on a two-tone flop: a flush draw with 9 clean outs and ~35% equity plays great as a semi-bluff — betting or raising gives you two ways to win (fold-outs now, flush later), while calling relies on pot odds alone. Check your price against the 35%/19.6% completion numbers, upgrade nut draws (ace-high) and combo draws (flush draw + pair, or + straight draw) aggressively, and downgrade weak draws in multiway pots where a second-best flush is a disaster. Our odds chart has the full outs-to-equity table for every draw type.