Free betting tools
Fast, free calculators — no signup required. Built on the same engine that powers Bankroll Guardian.
Parlay calculator
Enter each leg in American odds to get the combined price, decimal odds, payout and profit.
Open tool →Odds converter
Convert between American, decimal and fractional odds, and see the implied win probability.
Open tool →Bet calculator
Enter American odds and your stake to see the profit, total payout and implied win probability.
Open tool →Expected value (EV) calculator
Enter the odds and the win probability you believe to see whether a bet is positive expected value.
Open tool →No-vig & hold calculator
Enter both sides of a market to see the bookmaker’s hold and the fair, no-vig odds and probabilities.
Open tool →Closing Line Value (CLV) calculator
Compare the price you got to the closing line to see your CLV — the clearest sign of a long-term edge.
Open tool →Hedge calculator
Size a hedge bet on the opposite outcome so your profit is the same whichever way it lands.
Open tool →Stop calculating by hand
Bankroll Guardian tracks every bet and shows your P&L, ROI, CLV and where you’re leaking — free to start.