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