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Fee per contract
Kalshi fee calculator
On small-edge trades, the fee is not a footnote — it's the difference between a plan that works and one that bleeds. Kalshi's taker fee per contract is 0.07 × P × (1 − P), rounded up to the next cent, where P is the contract price in dollars. It's largest at 50¢ and shrinks toward the extremes.
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Total fees
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Total cost (price + fees)
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Profit if it wins
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Loss if it loses
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Break-even win rate
A winning contract pays $1.00. Break-even win rate = (price + fee per contract) ÷ $1 — the win probability a trade at this price must beat, after fees, just to come out flat. Try 90¢: the fee looks tiny, but you need to win about 91 times in 100. That asymmetry is why our rules cap entry prices — see the record for how it's handled.
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This calculator covers the taker (market-order) fee for a single buy at one price. Maker orders, sell-side exits, and portfolio-level rounding can differ — check Kalshi's published fee schedule for your exact case. Educational only, not financial advice.