A £40 call into a pot containing £160 offers 4:1 pot odds. Converting that price to a break-even percentage gives 20%, not 25%. The extra £40 joins the pot if the call is made, so the percentage uses £200 as its denominator.
The two figures answer different questions. The ratio compares the money already available with the additional call. The percentage expresses that call as a share of the total after it has been paid.
Neither figure measures the strength of a hand. This is an accounting explanation of a fictional poker decision, not a recommendation to call or a method for earning money.
Where the £160 comes from
Suppose a hand between two players has reached the river, after the final community card. The pot contains £120 before the opponent bets another £40. The player facing that bet has not yet paid anything in this betting round and would need £40 to call. Both players can cover that amount.
Assume a valid call ends the betting and the entire pot goes to the winning hand, with an equal division if the hands tie. There is no rake, other deduction or side pot in this first example. The pounds are teaching units, not a claim about a particular room or permission to play in a jurisdiction.
| Point in the hand | Amount in the middle | Additional amount needed to call |
|---|---|---|
| Before the opponent's river bet | £120 | No bet to match yet |
| After the opponent bets £40 | £160 | £40 |
| After a £40 call | £200 | The call is paid; betting ends |
The opponent's bet is already in the £160. Adding it again would count the same £40 twice. Conversely, using the old £120 would leave out money that is now part of the contest.
PokerStars Learn's pot-odds lesson includes the opponent's current bet in the pot before comparing it with the call. It then converts the ratio into a percentage by including the call in the total. Our £120/£40 ledger applies that convention to a separate invented example.
Here, £160 divided by £40 gives four. The offered ratio is therefore 4:1. For the percentage, £40 divided by (£160 plus £40) gives one fifth, or 20%. Dividing £40 by £160 instead gives 25%, but that is the call relative to the money already there, not its share of the completed £200 pot.
A returned call is part of the award
At the instant of the decision, folding costs no additional money. It also gives up any claim to the pot. Money contributed earlier remains part of the hand's history; it cannot be recovered by relabelling it as part of the new call.
If the player calls and wins alone, the £200 award includes the £40 just paid. Relative to the decision point, the gain is £160. If the call loses, the additional loss is £40. These are incremental results from this decision, not the profit or loss on the whole hand.
Let p be the assumed probability of winning outright in a model with no ties. The average incremental result is p × £160 minus (1 minus p) × £40. That simplifies to £200 × p minus £40. It equals zero when p is 0.20.
That is the source of the 20% break-even figure. It is a condition inside the stated model. The pot and call amount do not tell us whether any real hand has that probability.
Equity needs information the pot does not contain
Equity describes an expected share of a pot under an assumed set of possible outcomes. In this two-player model, a sole win receives the whole pot, a tie receives half and a loss receives none. If ties are possible, the expected share is the probability of a sole win plus half the probability of a tie.
For an invented distribution of 10% sole wins, 20% ties and 70% losses, that share is 20%: 10% plus half of 20%. Applied to a £200 pot, the average award is £40. Subtract the £40 call and the incremental expectation is zero.
The same result follows by accounting for each outcome. A sole win gains £160 from the decision point; a tie returns £100 for a gain of £60; a loss costs £40. Weighting those amounts gives £16 plus £12 minus £28, again zero.
Those probabilities are assumptions used to demonstrate the arithmetic, not an estimate for any cards. Estimating a real hand's equity requires information about the cards and possible opposing hands. Completing a draw does not automatically mean winning the pot, and a guessed percentage does not become reliable because it sits beside an exact calculation.
The distinction between an expectation and an individual result also appears in our casino expected-loss example. A probability-weighted average does not specify the outcome of the next hand.
A deduction changes the distributable amount
Now change one assumption. Suppose the room takes a fixed £10 from the completed £200 pot before awarding it. This is a hypothetical deduction, not a quoted rake rate. The distributable pot is £190 while the call still costs £40.
With no ties and no further costs, the incremental expectation is now £190 × p minus £40. Its zero point is £40/£190, about 21.05%. At the earlier assumed 20% win probability, the average award is £38 and the incremental result is minus £2.
PokerStars' commission explanation distinguishes withholding rake from cash-game pots from charges collected through tournament buy-ins. It does not make our flat £10 deduction a real tariff. Actual collection rules, caps and rounding require the applicable room's schedule, as our poker rake explainer shows.
A separate time charge or an entry fee needs its own accounting. Subtracting an arbitrary percentage from every pot would misdescribe a fee collected on another basis.
Future chips are not in the current pot
The worked hand ends its betting after the call. Earlier in a hand, paying one bet may leave another round in which more money can be required. Comparing the price of seeing one card with an assumed chance across two cards would combine different situations.
The PokerStars lesson discusses possible later winnings as implied odds and treats them as estimates. Future contributions depend on later action. They cannot be added to the existing pot as if the money had already been committed.
Eligibility matters too. A short stack may have no claim on a separate side pot, even if the screen displays one combined amount. Our side-pot example separates those claims; the simple £200 calculation here assumes both players are eligible for all of it.
For this fictional river decision, the numbers reconcile without a forecast: £120 already in the pot, £40 bet, £40 call, £200 before deductions. The 4:1 ratio and the 20% break-even share describe that same ledger. Neither supplies the missing assessment of a hand's equity.
