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    Tool
    April 20265 min read

    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

    12

    Fee Models

    5

    Updated

    Apr 2026

    Tool Type

    Calculator

    Run the fee check

    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.

    Coming from sportsbooks?

    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 guide
    Fee schedule version receipts

    Before you trust the calculator: pick the fee surface

    A fee calculator is only useful when its venue, token/category, wrapper, and timestamp assumptions match the trade you are checking.

    SurfaceFee sourceFreshnessBest user next step
    Direct venueOfficial fee page or centralized platform factsChecked date requiredCalculate net price using the venue actually traded.
    Token marketOfficial fee-rate endpoint or endpoint documentationLive or pending lookupFetch the token-specific fee rate before trusting edge math.
    Wrapper appCentralized platform facts plus wrapper disclosureChecked date requiredCompare the all-in wrapper cost against underlying exchange economics.
    Old screenshotNone or static imageStaleDo not rely on it for live strategy or calculator assumptions.

    Source policy

    Primary sources or centralized platform facts only. Reddit, X, competitors, affiliates, screenshots, and secondary summaries are demand signals only and must not render as factual proof.

    Audit bot/backtest fee assumptions

    Do not use for calculator trust

    • Reddit fee complaints as factual proof
    • competitor or affiliate fee tables
    • unverified numeric fee constants
    • old screenshots
    • strategy recommendations or expected-profit claims

    Fee Reality Check

    Sell Early @ $0.72

    Buy cost$6.50
    Buy fee-$0.20
    Gross sell$7.20
    Exit fee ($0.02/contract)-$0.20
    Profit+$0.30

    Hold to Settlement (wins)

    Buy cost$6.70
    Payout$10.00
    Profit+$3.30
    No exit fee on settlement

    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 guide

    Why this matters

    Beginners often have the right prediction but lose money by selling early because the fee drag looks small until it compounds across both sides.

    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 the main venues traders compare most often.

    Kalshi

    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)

    Polymarket

    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)

    Robinhood

    Convenience if already on Robinhood

    Buy fee: $0.02/contract ($0.01 RH + $0.01 Kalshi)

    Sell fee: $0.02/contract ($0.01 RH + $0.01 Kalshi)

    Settlement: None

    Round-trip: $0.01 Robinhood commission + $0.01 Kalshi exchange fee = $0.02 total per contract per side flat

    FanDuel Predicts

    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 Predictions

    DraftKings users in eligible states

    Buy fee: $0.01/contract/side + exchange fees (~$0.02+ round-trip)

    Sell fee: $0.01/contract/side + exchange fees (~$0.02+ round-trip)

    Settlement: None

    Round-trip: $0.01/contract/side + exchange fees (~$0.02+ round-trip)

    PredictIt

    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

    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

    Sporttrade

    Sports traders who want commission-only pricing

    Buy fee: None

    Sell fee: 2% of net winnings

    Settlement: 2% of net winnings

    Round-trip: 2% only when you win; $0 on losses

    Webull

    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

    Sleeper fantasy users

    Buy fee: $0.02/contract

    Sell fee: $0.02/contract

    Settlement: None

    Round-trip: ~$0.04/contract (Kalshi rail)

    Underdog

    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

    OG Predictions users

    Buy fee: $0.02/contract

    Sell fee: $0.02/contract

    Settlement: None

    Round-trip: ~$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 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.

    10¢
    0.63¢
    30¢
    1.47¢
    50¢
    1.75¢ (max)
    70¢
    1.47¢
    90¢
    0.63¢
    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.

    Dollar example: 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

    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

    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

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