16 calculators
Betting calculators
Pure-math tools, no signup. Paste an odds line, get the number that matters. American, decimal, fractional — auto-detected.
Odds Converter
Decimal ↔ American ↔ Fractional ↔ Implied %.
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Prediction Market Converter
Prediction price (¢) ↔ American / decimal odds. Kalshi & Polymarket.
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Parlay Calculator
Combined odds, payout, and profit for N legs.
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Hedge Calculator
Hedge stake for cash bets and free bets.
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Arbitrage Calculator
Arb profit % and per-leg stakes.
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Hold Calculator
Book's vig % plus no-vig fair value per side.
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Expected Value
EV per $1 against the posted market price.
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Kelly Criterion
Optimal bet size as a fraction of bankroll.
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Line Shopping
Best price plus full spread across books.
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No-Vig Fair Odds
Strip vig, recover true implied probability.
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Closing Line Value
CLV = your price / closing price − 1.
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Middle Calculator
Profit window when two lines middle.
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Round Robin
All 2-leg or 3-leg parlays from N picks.
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Teaser Calculator
NFL/NBA teaser payouts with points adjustment.
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Futures Calculator
Implied probability and EV on futures bets.
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Bet Tracker
Session P&L, ROI, and win rate across bets.
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