Enter a contract price and we’ll compute estimated fees per contract for Kalshi (taker/maker), PredictIt, and Polymarket. Values are per $1 payoff (use 0.60 for 60%).
Kalshi (Taker)
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Kalshi (Maker)
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PredictIt
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Polymarket
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Always check official fee schedules and your own execution costs - trade at your own risk! Note: PredictIt’s fee is assessed when you win (10% of profit), while Kalshi’s trading fees are charged when you place the order (taker/maker).
Frequently Asked Questions
This tool estimates the fees per $1 contract for Kalshi (taker/maker), PredictIt, and Polymarket at a given price. Use it to understand how much each platform’s structure will add to your cost or reduce your proceeds.
Because each exchange charges fees differently:
Kalshi: trading fees computed as round up(0.07 × C × P × (1 − P)) for takers and round up(0.0175 × C × P × (1 − P)) for makers (C=contracts, P=price in dollars); we present per-contract fees.
PredictIt: 10% fee on profits when your leg wins (this calculator shows the per-contract equivalent, e.g., at 60¢ the fee is $0.04). Withdrawal fee not included here.
Polymarket: 0% trading fee (assumed 0 here).
Taker = you cross the spread and fill immediately. Fee is computed with the 7% coefficient.
Maker = your order rests and someone else fills it. Fee uses the 1.75% coefficient. We show per-contract fees for both so you can compare.
PredictIt takes 10% of profits on winning positions. For a 60¢ contract that pays $1, the profit is $0.40 and the fee is $0.04. (PredictIt’s 5% withdrawal fee depends on account behavior and isn’t included here.)
Use the per-contract fees to adjust quotes when comparing platforms or sizing trades. For arbitrage, ensure that the combined costs (fees + purchase prices) leave a positive worst‑case net.