Shit, how's it calculated?
I know of 2 ways. I usually use the second out of habit. To make a pot-sized raise:
1) Determine the amount that you need to call. Calculate the pot, counting all the active bets (including your call) and the chips in the middle. That's your raise. You need to add the raise to call to get the total amount of your bet.
Example 1a: $10 in the pot at the start of the street. A opens for $5, B raises pot = ($5 for B's call) + (A's $5 bet) + ($10 in the middle) = a raise OF $20 for a total bet of $25.
Example 1b: $10 in the pot at the start of the street. A opens for $5, B raises to $25, C raises pot = ($25 for C's call) + ($25 for B's bet) + ($5 for A's bet) + ($10 in the middle) = a raise OF $65 for a total bet of $90.
2) Determine the amount of the bet you are facing (disregard any chips that you've already bet on this street). Multiply that by 3, and add it to the amount of all active bets on this street (exclude the bet you just called) plus the chips in the middle (the "trail"). This method is known as 3x plus the trail.
Example 2a: $10 in the pot at the start of the street. A opens for $5, B raises pot. B faces a bet of $5. 3 x $5 = $15. Add that to the $10 in the middle for a total bet, including the call and the raise, of $25.
Example 2b: $10 in the pot at the start of the street. A opens for $5, B raises to $25. C faces a bet of $25. 3 x $25 = $75. Add that to the trail of $15 (A's bet of $5 + the $10 in the middle) for a total bet, including the call and the raise, of $90.
I think of method #2 as being in two parts. First, consider the last person to bet or raise in front of us. Calling that person's bet is $x, at which point that part of the pot is $2x. We then match that with a pot-sized raise of $2x, making that part of the pot $4x. We subtract $1x from $4x to get our total bet of $3x (so far), which comprises our call of $1x and our raise of $2x. Second, we need to match the remaining chips on the table, the trail, which comprises all other active bets on this street plus the chips in the middle. This takes much longer to explain than to do.
A note on terminology: Pay attention to the difference between a raise
OF $x and a raise
TO $x. A verbal declaration of "Raise, $75" is generally interpreted as a raise
TO $75, equivalent to "Raise, make it $75."
It took me forever to type this, and I see that the two preceding posts cover the same material. Oh, well, I'm posting this anyway.