I was wondering what the correct formula for raising fractions of the pot is.

If pot is 50, and someone bets 50 (so pot now is 100) and we want to raise half pot:

fraction * (pot + 2 * bet) = 0.5 * (100 + 2 * 50) = 100

or

fraction * pot + 2 * bet = 0.5 * 100 + 2 * 50 = 150

Seems like diffrent softwares calculate it diffrently. Ofcource 0.5 could be any number (1 for full pot).

TBH, the only reason I've never played PLO at my local casino is that I have NO clue how to raise pot. XD

For pot size raises: Preflop, take the last bet, multiply by 3, and add any remaining money that is not the last bet. Post-flop, take the last bet, multiply by 4, and add any remaining money. For a half pot raise, maybe just divide the pot sized raise by two? It gets you pretty close, but isn't exact obviously.

Imagine you're playing live; toss in the amount a call would be, count the pot, then add 50% of the total pot after that.

eg: facing a 50 bet into a 100 pot, add an imaginary call to make the pot 200 (100+50+50). Then put in 100 more for the raise, giving 150 total.

That's the way that works cleanest in my head.

Pot = 50
Bet = 50
Total = 100

We match the bet, that makes the pot = 150
we raise half of that = 75

50 + 75 = 125

So 125 is our raise size if I'm correct.

You guys have different starting pot sizes (100 in Qulliam's post, and 50 in Sappie's) Both of you have the right answer, just to different questions.

Your numbers are correct, but your last sentence should replace "raise size" with "bet". The raise is 75. The total bet is 125. Saying the raise size is 125 would mean the next minumum raise would have to be 125 more, when it is really 75 more.

correct

This is the way I think about it, pretty simple.

- Full pot:

Amount to call + (actual size of the pot + amount to call) = pot sized raise

aka

Amount to call*2 + actual size of the pot = pot sized raise.

- Fraction of pot:

Amount to call + (actual size of the pot + amount to call) * F

Where F is the fraction of the pot you want to raise. If you want to raise half pot, then F=0.5. Want to raise 3/4 then F=0.75. And so on.

^^ Notice that the value you get from these equiations is the number of chips you have to add to the pot, not the number you have to raise the pot "to".

BTW, this is how table ninja calulates raises of % of the pot:

"In situations where someone else has bet in front of you TableNinja calculates a pot-percentage bet as the amount of chips that have been bet prior to your action plus half of a minimum raise times the specified percentage, plus half of a minimum raise. For example, if you are first to act on the flop and the pot is 1000 and 80% pot bet would 800. As a second example, if the small blind and the big blind post the blinds and two players limp an 80% pot sized bet would be 4.6 big blinds. That's 80% of 4.5 big blinds plus one additional big blind."

It's very similar to the equation I posted above but I wonder if there is any practical difference between using "half of a minimum raise" instead of "amount to call".

Calculate your bet size when you want to Raise Pot:

Say the pot is 100 and a villain bets 50 into it. You want to raise the pot.
Where P = original pot and B = Villain’s bet
P = 100; B = 50
P + 3*B = Total amount to bet to raise pot.
P = 100 B = 50
100 + 3*50 = 250

Calculate your Bet size to raise half pot:
0.5*P + 2*B = Total amount to bet to raise half pot.
P = 100; B = 50
0.5*100 + 2*50 = 150

Calculate your Bet size to raise quarter pot:
0.25*P + 1.5*B = Total amount to bet to raise half pot.
P = 100; B = 50
0.25*100 + 1.5*50 = 100

Timely.

LOL!

I googled how to calculate a half pot raise and all I got was this thread. I knew about the P+3*B formula for raising a full pot but couldn't find anything about raising half or quarter. After playing around with the P+3*B formula I came up with the half pot and quarter pot versions. I'm amazed that all those years of algebra finally paid off.

Edit: I had a copy paste error when explaining quarter pot.

Calculate your Bet size to raise quarter pot:

0.25*P + 1.5*B = Total amount to bet to raise quarter pot.

P = 100; B = 50

0.25*100 + 1.5*50 = 100

I made a document with full derivation and explanation along with mental shortcut

hope this helps

buncha nerds in here

Reviving a 2-year-old thread just to call them nerds lol. You must have gone out of your way to find this information