Prediction Market Fee Calculator — Know Your Real Profit
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
8
Fee Models
5
Updated
Apr 2026
Tool Type
Calculator
Quick Summary
The key takeaway from this page
Last updated: April 2026
Fee Reality Calculator
Know your real profit before you trade
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.
Fee Reality Check
Sell Early @ 72¢
Hold to Settlement (wins)
Hold is significantly better
Selling early at 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 guideWhy This Matters
Every week, Reddit sees new posts from beginners who had the right prediction but lost money by selling early. The most common mistake: selling a +7¢ gain on Robinhood, only to net less than $1 after round-trip fees. Holding to settlement would have earned 5x more.
Platform Fee Comparison
Side-by-side fee breakdown across all platforms
| Platform | Buy Fee | Sell Fee | Settlement | Round-trip |
|---|---|---|---|---|
| Kalshi | ~0.6–1.75¢/contract* (trading fee on entry) | None (exit is free) | None | ~0.6–1.75¢ one-way (formula-based entry fee only) |
| Polymarket | Sports 0.75% peak; Crypto 1.80% peak; Politics/Finance/Tech 1.00%; most fee-free at extremes | None (taker fee charged on entry only) | None | Taker fee at entry; 0 exit fee (geopolitics: free both ways) |
| Robinhood | $0.02/contract ($0.01 RH + $0.01 Kalshi) | $0.02/contract ($0.01 RH + $0.01 Kalshi) | None | $0.01 Robinhood commission + $0.01 Kalshi exchange fee = $0.02 total per contract per side flat |
| FanDuel Predicts | 2% of potential payout | 2% of potential payout (on early cash-out) | None | 2% each way (CME-powered) |
| DraftKings Predictions | $0.01/contract/side + exchange fees (~$0.02+ round-trip) | $0.01/contract/side + exchange fees (~$0.02+ round-trip) | None | $0.01/contract/side + exchange fees (~$0.02+ round-trip) |
| PredictIt | None | 10% of profit (only if profitable) | 10% of profit | 10% on gains + 5% withdrawal fee |
| Crypto.com | $0.02/contract ($1 markets) | $0.02/contract ($1 markets) | $0.01 on wins (tech fee waived); $0 on losses | ~$0.04/contract on $1 markets |
| Sporttrade | None | 2% of net winnings | 2% of net winnings | 2% only when you win; $0 on losses |
| Webull | $0.01/contract (exchange) | $0.01/contract (exchange) | None | ~$0.02/contract (Kalshi rail) |
| Sleeper | $0.02/contract | $0.02/contract | None | ~$0.04/contract (Kalshi rail) |
| Underdog | $0.02/contract (built into entry) | $0.02/contract | None | ~$0.04/contract |
| OG Predictions | $0.02/contract | $0.02/contract | None | ~$0.04/contract (CDNA structure) |
Fees as of April 2026. *Kalshi entry fee formula: 0.07 × P × (1 − P) per contract; peaks at 1.75¢/contract at 50¢. Polymarket (as of March 30, 2026) charges probability-based taker fees across most categories: Sports 0.75% peak, Crypto 1.80% peak, Politics/Finance/Tech 1.00%, Economics 1.50%, Culture 1.25%; geopolitics remains free. DraftKings Predictions charges a $0.01 transaction fee for each contract bought or sold, plus a separate exchange fee. Check each platform's official fee page for the latest.
In plain English:
- Kalshi: The closer to a coin flip (50/50 odds), the higher the fee — max 1.75¢. Longshots and near-certainties cost almost nothing. Politics and policy markets: zero taker fees, zero maker fees.
- Polymarket: Most bets are completely free. Only crypto price predictions (up to ~1.6¢/dollar) and a few sports markets (under 0.5¢/dollar) have fees.
- Robinhood: Two cents per contract every time. Simple and predictable.
- FanDuel: Takes 2% of what you could win, charged upfront. If you could win $50, they take $1.
- DraftKings: A penny when you buy, a penny when you sell, plus a small exchange fee.
Fee Examples by Platform
Real dollar amounts so you know exactly what you'll pay
Kalshi — Formula: 0.07 × P × (1 − P)
The fee scales with uncertainty. Closest to 50/50 = highest fee. Extremes cost almost nothing.
Dollar example: Buy 100 contracts at 50¢ = $1.75 total. Entry only — no exit fee.
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.
US venue (CFTC-regulated, QCX LLC DCM): Probability-based taker fees, peaking at 0.75% for sports near 50/50. Makers receive a 25% rebate on sports. Place limit orders to earn the rebate instead of paying the taker fee.
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.
Dollar example: Buy 100 contracts = $2.00 fee. Sell them = another $2.00. Round-trip = $4.00.
FanDuel — 2% of potential payout
Charged upfront on your potential winnings, not your stake.
Dollar example: Trying to win $50? They take $1 at checkout. 100 contracts × $1 payout = $100 potential → $2 fee upfront.
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.
Dollar example: 100 contracts round-trip = $2 in DK fees (+ CME exchange fees on top).
PredictIt — 10% of profits + 5% of withdrawals
A dime from every dollar you profit, then another nickel from every dollar you withdraw.
Dollar example: Win $100 → PredictIt takes $10. Withdraw that $90 → they take $4.50. You keep $85.50.
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.
Dollar example: 100 contracts on ForecastEx = $1.00 in exchange fees, zero commission. CME contracts through IBKR: $0.10/contract + $0.15 exchange fee, but pay $100 per contract.
Sporttrade — 2% of net winnings only
You only pay if you win. 2 cents from every dollar of profit. Lose? Pay nothing.
Dollar example: Bet $100, win $50 in profit → Sporttrade takes $1. Bet $100 and lose → $0 in fees.
Best Platform by Use Case
Which platform fits your trading style
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
Sporttrade
Sports traders who want commission-only pricing
Webull
Webull users trading sports event contracts
Sleeper
Sleeper fantasy users
Underdog
Underdog Fantasy users
OG Predictions
OG Predictions users
Frequently Asked Questions
4 common questions answered
Related Resources
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