Calculators and utilities to help you find opportunities, size positions, and trade smarter across prediction markets.
Built-in calculators and utilities
Calculate cross-platform arbitrage opportunities with fee adjustments. Find guaranteed profits across Polymarket, Kalshi, and other platforms.
Calculate expected value based on your estimated probability vs. market price. Find +EV betting opportunities.
Calculate how much to bet on the opposite outcome to lock in guaranteed profit when prices move in your favor.
Calculate the house edge (vigorish/juice) built into market prices. Understand how much you're paying in hidden fees.
Calculate the win rate you need to break even at a given market price, accounting for platform fees.
Optimize your position sizing based on your edge. Calculate the optimal bet size to maximize long-term growth.
Convert between odds formats (decimal, moneyline, fractional) and implied probability percentages.
Useful tools from prediction market platforms
Real-time whale watching and volume tracking. See large trades as they happen.
Official Kalshi trading API documentation for building automated strategies.
Official Polymarket Central Limit Order Book API for programmatic trading.
Check out our comprehensive guides on arbitrage, position sizing, and trading strategies.