Bet calculator at Oddschecker helps you work out odds and winnings for multiple bets. Combine the bets to calculate the acca and permutation betting totals. Free online Odds Ratio (OR) statistical calculator calculates Odds Ratio with 95% Confidence Interval from a 2x2 table. Use the Accumulator return calculator to work out your winnings online for all sports. Free, easy to use and mobile friendly bet calculator.