Free Betting Tools
The calculators every serious bettor needs, free and instant, no signup, no email, all math runs in your browser. The same formulas SmartBet Lab applies to your synced bets.
Odds Converter
Convert betting odds between decimal, American and fractional formats and see the implied probability. Free, instant, no signup.
CLV Calculator
Enter the odds you took and the closing odds to compute your closing line value, using the same formula SmartBet Lab applies to synced bets.
Kelly Criterion Calculator
Compute the Kelly stake for your bankroll from decimal odds and your estimated win probability, with fractional Kelly options.
Parlay Calculator
Compute accumulator odds and payout for up to 12 legs, plus the implied win probability and why the bookmaker margin compounds per leg. Free, no signup.
Bookmaker Margin Calculator
Enter a complete market to see the bookmaker margin and the devigged fair odds for every outcome, using the same normalization behind our fair odds boards.
Expected Value (EV) Calculator
Compute a bet’s expected value from decimal odds and your win probability, plus the break-even rate and your edge over the market. Free, no signup.
Break-Even Win Rate Calculator
Enter your typical odds to see the win rate you must sustain to break even, and what your actual win rate earns or loses per bet long-run.