*Originally posted by LacsapR*

Once I have the number of outs - how do I calculate if I can call or not as for example in this case?

And is there a way how to do that quick and easy while playing?

A quick way is the rule of 2 and the rule of 4.

They are rough rules of thumb that give you the equity as a %. So you multiply the outs by 2 if you’re calling a bet to see one more street, which gives roughly 24% with 12 outs. Since you were calling all-in, and guaranteed to see two more streets, then you multiply the outs by 4 to get your equity. That’s 48% here.

My more precise calculation above is 1 - (the chance we don’t hit an out OTT AND we don’t hit an out OTR), which gives me the chances of hitting on one or both streets. Of course, you can’t do that in real time, so we can just use the rough rules.