Find risk-free arbitrage opportunities between Kalshi and other prediction markets. Calculate stakes and guaranteed profit after fees.
Kalshi's CFTC-regulated prices sometimes differ from Polymarket, Robinhood, or DraftKings on the same events. Price discrepancies create arbitrage opportunities — but Kalshi's taker fees must be factored in to confirm the arb survives after costs.
Monitor the same event contract across Kalshi and another platform (e.g., Polymarket).
When the Yes price on one platform + the No price on the other < $1.00 (minus fees), an arb exists.
Enter both prices into the Arb Calculator along with each platform's fee structure.
Review the guaranteed profit after fees. If positive, the arb is real.
Size your positions according to the calculator's recommended stake allocation.
Event: 'Will X happen?' Kalshi Yes at $0.42 (fee: $0.02). Polymarket No at $0.52 (fee: $0.01). Total cost: $0.42 + $0.02 + $0.52 + $0.01 = $0.97. Guaranteed payout: $1.00. Arb profit: $0.03/contract (3%).
Fee model: 7% × p × (1−p) per contract (taker)
Formula: ceil(0.07 × P × (1-P) × 100) / 100
Timing: Charged at time of trade
Find and calculate arbitrage between Polymarket and other prediction markets. Account for Polymarket's unique fee structure.
Kalshi Fee Calculator — Taker & Maker Fees ExplainedCalculate exact Kalshi fees for any contract price. Compare taker vs maker fees and find your true break-even.
Kalshi Break-Even Calculator — Win Rate After FeesFind the minimum win rate you need on Kalshi after accounting for taker and maker fees.
Kalshi Expected Value CalculatorCalculate expected value and Kelly bet sizing for Kalshi contracts, including taker and maker fee adjustments.
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