How to analyse calling an all-in vs 2 opponents?

Rule of 2 and 4 is good for the flop and turn you can't really extend it to preflop.

You need to refine the rule of 4 a bit when you have lots of outs. For more than 8 outs, mutliply by 4 and then subtract the number of outs beyond 8. So if you have 12 outs otf, that's 4 outs beyond 8 and you have about
12*4 - 4 = 48 - 4 = 44% equity.

Originally Posted by seven-deuce

Thanks MMM,

So as a rough guide post flop you have your outs*2 = your equity?

Only when the equity is really low. With only 2 outs, or 4% per draw, the approximation holds pretty true. When it gets close to or over 50%, then the approximation fails badly.
Like, AK vs QQ is close to 48% vs 52% equity, respectively, but if you try to use the approximation of 2% per out per draw, you'd come up with 6*2%*5 = 60% equity for AK, instead of 48%.

Originally Posted by daviddem

Rule of 2 and 4 is good for the flop and turn you can't really extend it to preflop.

You need to refine the rule of 4 a bit when you have lots of outs. For more than 8 outs, mutliply by 4 and then subtract the number of outs beyond 8. So if you have 12 outs otf, that's 4 outs beyond 8 and you have about
12*4 - 4 = 48 - 4 = 44% equity.

Agreed, severely limited use pre.

Just because I can't stress it enough: the rule of 4 only applies to all-in calls OTF. Otherwise, you should use the rule of 2 OTF as well.