Calculators
Prediction market calculators.
Free tools for Kalshi and Polymarket traders, with each platform’s fees built in.
Expected value calculator
Enter a price, your probability and the fee. See the expected profit per contract, the break-even probability and the return on your money.
Kelly criterion calculator
Enter your bankroll, the price and your probability. See how much to bet, in dollars and in whole contracts, at full, half or quarter Kelly.
Stop guessing.Read the market.Stop guessing. Read the market.
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