Tools · client-side
Polymarket payout calculator
Enter side, buy price, and dollar stake. Get contracts, payout if you win, profit, and ROI. Winning shares pay $1 with no payout fee on Polymarket.
If YES wins
If YES loses
Polymarket does not charge a fee on winning payouts. A winning share pays $1; profit is payout minus what you paid. This is research math in your browser — not a trade ticket. If venue fees change, update this copy. The other side of a 34¢ YES is about 66¢.
Worked example
$100 on YES at 34¢ buys about 294.12 shares. If YES resolves, payout is $294.12, profit $194.12, ROI +194%. If YES loses, the shares are worth $0 (−100% ROI). Spread, slippage, and early exit are not modeled — this is settlement math, not a backtest.
FAQ
How is Polymarket payout calculated?
Divide your stake by the share price in dollars to get the number of contracts. If that side wins, each share pays $1, so payout equals the contract count. Profit is payout minus stake; ROI is profit ÷ stake.
Does Polymarket take a fee on winning payouts?
No. As of 2026 Polymarket does not charge a fee when a winning share pays $1. Your profit is the difference between $1 per share and the price you paid. If venue fees change, treat this page as stale until we update the copy.
Does buying NO work the same way?
Yes. Enter the NO share price (about 100¢ minus the YES price, ignoring spread). Contracts, payout, and ROI use the same formulas — the side label is only for your notes.
Is this a trade ticket?
No. Polydata never executes trades. The calculator does not hit an API. Use it to size a hypothetical, then trade on Polymarket if you choose.
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