Sharp Math & Betting Calculators
Strip out sportsbook hold to uncover true no-vig win probabilities, size bankroll stakes with fractional Kelly Criterion math, price multi-leg parlays, and calculate exact live hedge and arbitrage splits before locking in your ticket.
Individual Calculator Pages & Mathematical Formulas
Free arbitrage betting calculator. Enter the odds for each outcome and your total stake to get the exact stake split and guaranteed profit on a risk-free arb.
Free parlay calculator. Add each leg's odds and your stake to get combined parlay odds, total payout, and profit - for 2-leg to large multi-leg bets.
Free hedge betting calculator. Enter your original bet and the current opposite-side odds to get the exact hedge stake and your guaranteed profit or minimized loss.
Free Kelly Criterion calculator. Enter the odds and your true win probability to get the optimal fraction of your bankroll to bet, with full, half, and quarter Kelly.
Free no-vig calculator. Enter both sides of a market to strip out the sportsbook's margin and reveal the fair odds and true no-vig probability of each outcome.
Free hold calculator. Enter both sides of a market to see the sportsbook's hold - the built-in margin, or vig - so you can tell sharp low-margin books from expensive ones.
Free-bet calculator. See how much guaranteed cash a 'bet and get' free bet is worth and the exact hedge to convert it, since free bets don't return the stake.
Free odds converter. Translate American, decimal, and fractional odds and see the implied win probability of any price instantly.