Betting & Prediction Market Tools

Convert between American, decimal, fractional, implied probability, and prediction market cents.

Calculate combined odds and payouts for multi-leg parlays across any odds format.

Find expected value by comparing your estimated probability against the market price.

Compare trading fees across Kalshi, Polymarket, Crypto.com, FanDuel, and DraftKings.

Calculate the vig (juice) built into a two-way or multi-way market and extract fair odds.

Find the optimal hedge bet size to lock in profit or minimize loss across outcomes.

Detect and size arbitrage opportunities across platforms for guaranteed profit.

Determine optimal position size using the Kelly Criterion based on your edge and bankroll.

Track profit and loss across positions with support for partial exits and fee adjustments.

Find the exact probability needed to break even at a given price, including platform fees.

Simulate bankroll growth over hundreds of bets using Monte Carlo methods and Kelly sizing.

Paste odds in any format and get a plain-English explanation of what they mean.

See your real return after all platform fees, deposits, and withdrawals are factored in.