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Free Kalshi tools

Quick calculators for prediction-market traders. Work out your fees, odds, payout, edge, and position size in seconds. No signup, nothing leaves your browser.

Want the full picture across your whole history? See the guides, or try ContractTax.

Kalshi fee calculator
Estimate the trading fee on any Kalshi order.
Kalshi odds converter
Convert a Kalshi price to probability and betting odds.
Kalshi payout calculator
See your cost, payout, profit, and ROI on a trade.
Expected value (EV) calculator
Find your edge: compare your probability to the price.
Arbitrage calculator
Check if two prices lock in a guaranteed profit.
Position size calculator
Size a trade by bankroll percent or the Kelly criterion.
Kalshi tax calculator
Estimate federal tax on your Kalshi profit.
Breakeven win rate calculator
Find the win rate a contract price requires.
Bankroll growth simulator
Project how a steady edge compounds over time.
No-vig fair odds calculator
Strip the vig from a sportsbook line and compare it to Kalshi.
Risk of ruin calculator
The odds your bankroll hits zero before your horizon.
Prediction market state tax calculator
Estimate federal plus state tax on your Kalshi profit.