Calculate expected value for Robinhood event contracts including the flat per-contract fee.
Robinhood's flat $0.02 per contract fee makes EV calculations straightforward. The fee is the same regardless of contract price, so your EV analysis focuses purely on your edge estimate versus the market price.
Enter the Robinhood contract price.
Input your estimated true probability.
Review the EV per contract after the $0.02 fee.
Compare against the same contract on Kalshi or Polymarket.
Use Kelly sizing to determine how many contracts to buy.
Robinhood Yes at $0.50, true probability 57%. Fee = $0.02. EV = (0.57 × $1.00) - $0.52 = $0.05/contract. Kelly = (0.57 × 0.48 - 0.43 × 0.52) / 0.48 ≈ 10.4% of bankroll.
Fee model: $0.01–$0.02 per contract
Formula: $0.01 Robinhood fee + up to $0.01 exchange fee per contract
Timing: Charged at time of trade
Calculate expected value and Kelly bet sizing for Kalshi contracts, including taker and maker fee adjustments.
Polymarket Expected Value CalculatorCalculate EV and optimal sizing for Polymarket positions, accounting for the 2% profit fee.
Robinhood Event Contract Fees ExplainedCalculate Robinhood's flat $0.01-$0.02 per contract fee and compare to other platforms.
Robinhood Event Contracts Break-Even CalculatorCalculate the minimum win rate on Robinhood event contracts after the flat per-contract fee.
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