[5NL] JJ, IP, 3bet pot, river spot.

[rpm]

Stop thinking in terms of how many times his bet you are raising to, this is irrelevant. If he bet 0.05 into 1.25, would it make any sense for you to raise only to 0.30, even though this is 6 times his bet? Look at how much you bet/raise in relation to the pot, this is the proper way.
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this is flawed imo. your example definitely highlights an important point (not focussing solely on how many multiples of an opponents bet we are raising), but i think a far better way to think about bet/raise sizes is to consider firstly ranges. that is, what will villain call/raise/fold with when we make it this size? what about this one? second we need to consider the EV of different sizes, which is obviously determined by what our opponents C/R/F ranges are. which size makes us the most money? against which bet/raise size will villain make the most mistakes (in $ terms)?

knowing how to calculate what the pot is and knowing what odds certain sizes give our opponents to call is definitely useful. but i think an understanding of the above will make a far better poker player

[daviddem]

this is flawed imo. your example definitely highlights an important point (not focussing solely on how many multiples of an opponents bet we are raising), but i think a far better way to think about bet/raise sizes is to consider firstly ranges. that is, what will villain call/raise/fold with when we make it this size? what about this one? second we need to consider the EV of different sizes, which is obviously determined by what our opponents C/R/F ranges are. which size makes us the most money? against which bet/raise size will villain make the most mistakes (in $ terms)?

knowing how to calculate what the pot is and knowing what odds certain sizes give our opponents to call is definitely useful. but i think an understanding of the above will make a far better poker player

Completely agree, but as usual it's important to understand the basic math behind it to be able to make effective sizing variations. What's the point teaching how to optimize a raise size vs a range, or EV of various sizes before teaching what is the minimum that should be bet to correctly charge drawing hands and why?

In other words: read Sklansky before you read "let there be range" or "easy game".