A contract quoted at 63 cents can look straightforward: pay $0.63, receive $1 if the event happens. But that is only the clean version. To understand how to calculate contract payoff, you need to separate settlement value from trading profit, then account for quantity, fees, exits, and the rulebook that decides what actually happened.
Prediction-market interfaces are very good at showing a number that resembles a probability. They are less reliable as teachers of cash-flow arithmetic. The difference matters. A contract can settle correctly and still produce a disappointing net result once fees and execution are included. Conversely, a trader can profit before the event occurs without ever collecting the full settlement payout.
Start with the contract's settlement terms
Most event contracts are binary. A contract resolves to a fixed amount - commonly $1 for YES and $0 for NO - when the stated event meets the platform's resolution criteria. If you own 100 YES contracts at settlement and the answer is YES, their gross value is $100. If the answer is NO, they are worth $0.
The basic settlement-payoff formula is:
`Gross settlement payoff = Number of contracts × Settlement value × Resolution result`
For a standard $1 binary contract, the resolution result is 1 when your side wins and 0 when it loses.
Suppose you buy 40 YES contracts for $0.58 each on a market asking whether a specified economic report will exceed a stated figure.
If YES resolves true:
`40 × $1 × 1 = $40 gross settlement payoff`
If YES resolves false:
`40 × $1 × 0 = $0 gross settlement payoff`
That $40 is not your profit. You paid $23.20 to acquire the contracts. A surprising number of promotional explainers blur this distinction, perhaps because gross payouts look friendlier than actual returns.
Calculate profit, not just the contract payoff
For a contract you buy and hold to settlement, use this formula:
`Net profit or loss = Contracts × (Settlement value × Resolution result - Purchase price) - Total fees`
Using the 40-contract example, a correct YES outcome produces:
`40 × ($1 - $0.58) = $16.80 before fees`
If entry and settlement-related fees total $0.70, your net profit is $16.10. Your gross settlement proceeds remain $40, but your total cash outlay was $23.90.
If the contract resolves NO, the calculation is:
`40 × ($0 - $0.58) - $0.70 = -$23.90`
Your maximum loss on a straightforward long position is usually the amount paid plus applicable fees. Your maximum pre-fee gain on a $1 contract is $1 minus your purchase price, per winning contract. Buy at 58 cents, and the most you can make by holding to a winning settlement is 42 cents per contract before fees.
A quick return-on-cost check
Dollar profit is useful, but return on capital often gives the clearer comparison between trades.
`Return on cost = Net profit ÷ Total amount paid`
In the example above, a $16.10 gain on a $23.90 total cost is roughly a 67.4% return. That is not a 42% return just because the contract moved from $0.58 to $1. Price movement and return on the capital committed are different measurements.
This calculation also exposes a basic reality of short-dated, high-price contracts. Buying YES at $0.95 may have a high implied probability, but a win yields only 5 cents per contract before fees. A small fee can take a meaningful bite out of that narrow upside.
How to calculate contract payoff when you exit early
You do not need to wait for resolution. If you buy contracts and later sell them, your realized result depends on the sale price rather than the final outcome.
`Trading profit or loss = Contracts × (Sale price - Purchase price) - Entry fees - Exit fees`
Say you purchase 75 YES contracts at $0.42 and later sell them at $0.57.
`75 × ($0.57 - $0.42) = $11.25 before fees`
If your combined fees are $1.05, your realized gain is $10.20. Whether the event eventually happens is no longer relevant to that closed position. You sold the claim; someone else now owns the settlement risk.
This distinction becomes especially useful in markets that react quickly to a poll, court filing, earnings release, or news report. A favorable price move can be monetized before settlement, but only if the displayed price is actually executable for your size. A last-traded price is evidence that one trade happened, not a promise that 75 contracts are waiting for you at that price.
Fees change the math more than traders expect
Before calculating a payoff, identify how the venue charges. Regulated exchanges, broker-distributed products, and on-chain protocols can apply very different cost structures. Some charge a transaction fee, some charge at settlement, some embed costs in spreads, and some add network fees or conversion costs. “Zero commission” is not a full cost disclosure. It is often the beginning of one.
For each trade, check four possible cost points: entry fees, exit fees, settlement fees, and funding or withdrawal costs. The last category may not change the payoff of one contract, but it absolutely changes the economics of a small account.
If a platform calculates fees as a percentage of potential profit rather than trade value, the result may differ depending on whether you buy at 15 cents or 85 cents. Read the fee schedule and run the numbers using the platform's stated method. If the platform does not publish enough detail to reproduce the charge, treat that as unresolved information rather than filling in the blanks with optimism.
Contract wording decides what counts as a win
The arithmetic is easy. Resolution is where the interesting problems live.
A market titled “Will Candidate A win the election?” may resolve according to an official certification, a named news organization, or a platform-designated source. A contract on inflation may specify a particular release date, index, geographic scope, adjustment method, and rounding rule. “Above 3.0%” is not the same as “3.0% or higher.” One character can move the payout from $1 to $0.
Read the full contract rules before trading, particularly the resolution source, deadline, definitions, treatment of revisions, cancellation policy, and dispute process. The headline is a label. The rules are the instrument.
A voided or canceled market can also produce a different outcome from either YES or NO. Many venues return collateral or settle under a stated cancellation procedure. Do not assume a canceled contract pays $1 merely because the event was likely to occur. Markets do not settle on vibes, however compelling the vibes may be.
Multi-outcome and non-$1 contracts need adjusted formulas
Not every market is a simple YES/NO contract. Some platforms offer multiple possible outcomes, ranges, ranked selections, or contracts with a stated value other than $1. The same framework works, but you must use the actual settlement value and the rules for mutually exclusive outcomes.
For a $10 contract purchased at $3.40, the maximum pre-fee profit from a winning settlement is $6.60 per contract, not 66 cents. For a market with several outcome contracts, only the correct outcome may pay the full settlement amount, while every other outcome settles at zero.
Some market structures also allow complementary positions. In a standard binary market, buying one YES and one NO contract for a combined price below the guaranteed combined settlement value can create a locked-in gross spread before costs. If the combined price is above that value, you are paying more than the maximum combined payoff. Fees, available size, and settlement mechanics determine whether either observation is tradable rather than merely cute spreadsheet trivia.
Use a pre-trade worksheet, not mental math
Before placing an order, write down the contract side, contract count, purchase price, maximum settlement value, all known fees, and the exact condition that resolves the market. Then calculate three numbers: loss if wrong, profit if held to a favorable settlement, and profit or loss at your planned early exit price.
For example, buying 120 contracts at $0.31 with $1.20 in total expected fees produces a maximum loss of $38.40. If the contracts settle at $1, the net profit is `120 × ($1 - $0.31) - $1.20`, or $81.60. If you plan to sell at $0.45 instead, the estimated trading profit is `120 × ($0.45 - $0.31) - applicable entry and exit fees`.
That worksheet is also a useful way to compare platforms. A lower quoted price is not automatically a better trade if the venue has thin liquidity, higher settlement fees, restricted access in your location, or contract rules you cannot verify. PredictHub's general rule is less exciting but more durable: compare the documented product, not the marketing screenshot.
The final check is simple: make sure you know whether you are looking at payout, proceeds, or profit. They are not interchangeable, and treating them as interchangeable is how a 63-cent contract becomes an unexpectedly expensive lesson.