Calculate exactly what you'll earn (or lose) after fees on Kalshi, Polymarket, and Robinhood. Compare early exit vs. hold to settlement. Stop losing money to hidden fees.
Platforms
11
Fee Models
5
Updated
Apr 2026
Tool Type
Calculator
Prediction market fees vary by platform and can turn a winning trade into a loss. Enter your trade details below to see exactly what you'll earn after fees.
Compare a fee-adjusted market price to a sportsbook-style odds equivalent before treating a displayed contract price like an executable ticket.
Open the sportsbook true-price guideSell Early @ $0.72
Hold to Settlement (wins)
Hold is significantly better
Selling early at $0.72 earns $0.30. Holding to settlement earns $3.30 if you're right. Early exit costs you $3.00 in potential profit.
Flat $0.02 fee per contract per trade ($0.01 commission + $0.01 exchange). Total round-trip cost: $0.04/contract regardless of price.
View full fee guideBeginners often have the right prediction but lose money by selling early because the fee drag looks small until it compounds across both sides.
Side-by-side fee breakdown across the main venues traders compare most often.
Holding to settlement
Buy fee: ~0.6–1.75¢/contract* (trading fee on entry)
Sell fee: None (exit is free)
Settlement: None
Round-trip: ~0.6–1.75¢ one-way (formula-based entry fee only)
Geopolitics/world events (free); active traders using limit orders
Buy fee: Sports 0.75% peak; Crypto 1.80% peak; Politics/Finance/Tech 1.00%; most fee-free at extremes
Sell fee: None (taker fee charged on entry only)
Settlement: None
Round-trip: Taker fee at entry; 0 exit fee (geopolitics: free both ways)
Convenience if already on Robinhood
Buy fee: Variable, max $0.01/contract + exchange fee
Sell fee: Variable, max $0.01/contract + exchange fee
Settlement: None
Round-trip: Variable commission up to $0.01/contract (lower near contract extremes near $0.01 or $0.99), plus exchange fee (Rothera, Kalshi, or ForecastEx depending on contract). Gold subscribers receive up to 50% commission discount. Effective June 1, 2026. flat
Sports fans in non-betting states
Buy fee: 2% of potential payout
Sell fee: 2% of potential payout (on early cash-out)
Settlement: None
Round-trip: 2% each way (CME-powered)
DraftKings users in eligible states
Buy fee: $0.01/contract platform fee (+ CME exchange fees)
Sell fee: $0.01/contract platform fee (+ CME exchange fees)
Settlement: None
Round-trip: $0.01/contract platform fee (+ CME exchange fees)
US politics watchers (caps at $850/position)
Buy fee: None
Sell fee: 10% of profit (only if profitable)
Settlement: 10% of profit
Round-trip: 10% on gains + 5% withdrawal fee
Crypto.com users; tech-fee waiver favors holding to win
Buy fee: $0.02/contract ($1 markets)
Sell fee: $0.02/contract ($1 markets)
Settlement: $0.01 on wins (tech fee waived); $0 on losses
Round-trip: ~$0.04/contract on $1 markets
Webull users trading sports event contracts
Buy fee: $0.01/contract (exchange)
Sell fee: $0.01/contract (exchange)
Settlement: None
Round-trip: ~$0.02/contract (Kalshi rail)
Sleeper fantasy users
Buy fee: $0.02/contract
Sell fee: $0.02/contract
Settlement: None
Round-trip: ~$0.04/contract (Kalshi rail)
Underdog Fantasy users
Buy fee: $0.02/contract (built into entry)
Sell fee: $0.02/contract
Settlement: None
Round-trip: ~$0.04/contract
OG Predictions users
Buy fee: $0.02/contract
Sell fee: $0.02/contract
Settlement: None
Round-trip: ~$0.04/contract (CDNA structure)
In plain English:
Real dollar amounts so you know exactly what you'll pay before the trade is placed.
Kalshi — Formula: 0.07 × P × (1 − P)
The fee scales with uncertainty. Closest to 50/50 = highest fee. Extremes cost almost nothing.
Polymarket — Most markets: $0 fee
Politics? Free. Elections? Free. Only crypto price bets (≤1.80% at 50¢) and NCAAB/Serie A sports (≤0.75% at 50¢) have fees.
Robinhood / Coinbase / Sleeper — $0.02/contract flat; Crypto.com/OG — $0.02 ($1 contracts) or $0.20 ($10 contracts)
Two cents per contract, every time — buy or sell. No formula, no percentage.
FanDuel — 2% of potential payout
Charged upfront on your potential winnings, not your stake.
DraftKings — $0.01/contract to buy + $0.01/contract to sell + CME exchange fees
A penny in, a penny out, plus a variable exchange fee from CME Group.
PredictIt — 10% of profits + 5% of withdrawals
A dime from every dollar you profit, then another nickel from every dollar you withdraw.
Interactive Brokers ForecastEx — $0 commission + $0.01/contract exchange fee
The cheapest option. On their own ForecastEx exchange, fees are under a penny per contract.
Use this as the quick recommendation layer once you understand the fee structure.
Kalshi
Holding to settlement
Polymarket
Geopolitics/world events (free); active traders using limit orders
Robinhood
Convenience if already on Robinhood
FanDuel Predicts
Sports fans in non-betting states
DraftKings Predictions
DraftKings users in eligible states
PredictIt
US politics watchers (caps at $850/position)
Crypto.com
Crypto.com users; tech-fee waiver favors holding to win
Webull
Webull users trading sports event contracts
Sleeper
Sleeper fantasy users
Underdog
Underdog Fantasy users
OG Predictions
OG Predictions users
4 common questions answered
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