Free betting calculators

Ten tools that do the maths for you. They run in your browser, so nothing you type is sent to us.

• Odds Converter
  Decimal, fractional, American and implied probability. · implied % = 100 ÷ oddsOpen →
• Arbitrage Calculator
  Check if two prices lock in a profit, and split the stake. · 1/o₁ + 1/o₂ < 1Open →
• EV Calculator
  See whether a bet pays over time, from your own estimate. · EV = p × odds − 1Open →
• Parlay Calculator
  Combined odds, payout and the margin you pay per leg. · odds = o₁ × o₂ × … × oₙOpen →
• Hedge Calculator
  The stake that gives the same result whichever side wins. · hedge = stake × odds ÷ hedge oddsOpen →
• Kelly Criterion
  How much of your bankroll a bet deserves. · f = (b·p − q) ÷ bOpen →
• Vig Calculator
  The bookmaker margin, and fair odds without it. · margin = Σ 1/oᵢ − 1Open →
• Bonus Rollover
  Whether a deposit bonus is worth its wagering. · value = bonus − turnover × marginOpen →
• Poisson Predictor
  Home, draw, away, goals and BTTS chances from xG. · P(k) = λᵏ e⁻λ ÷ k!Open →
• Bet Tracker
  Log every bet and see your real ROI and profit line. · ROI = profit ÷ stakedOpen →