Background:
I don't normally play an Ax flush draw from early position, but the other players at the table were playing a lot of flops with limping or minraising pre-flop. So, I figured I could see a cheap flop with multiway action.

I didn't have pot odds for the flop call, but, with the way listriton and jojoiswired played post flop, I felt they would continue betting hard, even if the flush hit. So, I was reasonably confident that I had implied odds to make the call.

Now that I have had some time to analyze my hands for the week, I have been thinking about what is the minimum the two other players would have needed to bet if the flush hit, in order for me to have the implied odds to make the call.

Is there a simple calculation for this?

Thanks

***** Hand History for Game 1922189962 *****
$50 NL Hold'em - Wednesday, April 20, 02:09:24 EDT 2005
Table Table 36953 (6 max) (Real Money)
Seat 5 is the button
Total number of players : 6
Seat 1: sky_h22 ( $44.09 )
Seat 2: spin_md ( $43.65 )
Seat 3: listriton ( $105.1 )
Seat 4: jojoiswired ( $62.8 )
Seat 6: Filth4uranus ( $31.5 )
Seat 5: mila1960 ( $46.25 )
Filth4uranus posts small blind [$0.25].
sky_h22 posts big blind [$0.5].
** Dealing down cards **
Dealt to spin_md [ Ad 4d ]
spin_md calls [$0.5].
listriton raises [$1].
jojoiswired calls [$1].
mila1960 calls [$1].
Filth4uranus folds.
sky_h22 calls [$0.5].
spin_md calls [$0.5].
** Dealing Flop ** [ Ks, Qd, Td ]
sky_h22 checks.
spin_md checks.
listriton bets [$15].
jojoiswired calls [$15].
mila1960 folds.
sky_h22 folds.
spin_md calls [$15].
** Dealing Turn ** [ 7d ]
spin_md checks.
listriton bets [$0.5].
jojoiswired raises [$20].
spin_md is all-In.
listriton calls [$27.15].
jojoiswired calls [$7.65].
** Dealing River ** [ Kh ]
listriton bets [$60].
jojoiswired is all-In.
listriton shows [ Tc, Jc ] two pairs, kings and tens.
jojoiswired shows [ 9d, Kd ] a flush, king high.
spin_md shows [ Ad, 4d ] a flush, ace high.
listriton wins $40.85 from side pot #2 with two pairs, kings and tens.
jojoiswired wins $38.3 from side pot #1 with a flush, king high.
spin_md wins $131.2 from the main pot with a flush, ace high with ace kicker.