Research Tools · Manual Quote Comparison
Manual YES/NO Pair Calculator
Enter an executable YES ask, an executable NO ask, and your fee estimate. The calculator reports only theoretical gross and after-fee margin; it does not infer quotes, confirm contract equivalence, or execute trades.
Theoretical comparison only
Gross margin
+5.0¢
100¢ − YES ask − NO ask
After entered fees
+3.0¢
3.1% of entered total cost
A positive result means only that the entered arithmetic is below 100¢. It does not show that both asks remain available, that your size can fill, or that the two contracts settle identically.
Before acting, verify available depth, partial-fill risk, slippage, the venue-specific fee schedule, outcome wording and resolution sources, void/cancellation rules, custody and funding constraints, settlement timing, and jurisdiction. Prices can move between legs.
Arithmetic is the start of the review
A similar headline on two venues is not enough to call the contracts equivalent. Compare each listing’s outcome wording, resolution source, deadlines, void rules, fees, and available depth. Browse venue-attributed listings on the predictions desk or check what fees do to a single position with the breakeven calculator.
Frequently asked questions
How does the theoretical YES/NO pair calculation work?
For two contracts that truly settle the same binary outcome, a YES leg and a NO leg have a theoretical combined settlement value of 100¢. This calculator subtracts user-entered executable asks and fees from that amount. It does not verify equivalence, availability, fills, or settlement.
Why do Kalshi and Polymarket price the same market differently?
Different pools of traders, liquidity, fee schedules, contract wording, resolution sources, and settlement timing can all produce different quotes. Similar headlines do not establish equivalent contracts; read both rulebooks and verify the exact outcome.
Does a positive calculator result guarantee a return?
No. It is arithmetic over entered values. Real outcomes depend on available depth, partial fills, slippage, current fees, contract equivalence, void and cancellation rules, custody and funding, venue access, and settlement timing. Prices can move before both legs fill.
Educational tool, not advice. Prediction market trading involves risk of loss; venues may be restricted in your jurisdiction. 18+.