Free trading utilities
Prediction market calculators
Six free tools for converting odds, removing market margin, hedging positions, finding arbitrage, measuring expected value and sizing trades
Hedging Calculator
Find the exact hedge position needed to lock in a guaranteed return whichever way the market resolves.
No-Vig Fair Odds
Remove the market margin to reveal fair odds and the underlying probability of each outcome.
Odds Converter
Convert American, decimal and fractional odds into implied probability and prediction-market prices.
Arbitrage Calculator
Check whether prices create an arbitrage opportunity and calculate the stakes for each position.
Expected Value
Compare your estimated probability with the current market price to measure expected value and edge.
Kelly Criterion
Calculate a risk-aware position size from your bankroll, estimated edge and preferred Kelly fraction.