The same math that sharps run before every wager — built into clean, fast tools you can bookmark and use on any betting site. No sign-up, no ads, no data leaves your browser.
Combine up to 12 legs in any odds format. Get instant payout, profit, and combined American line.
Open →American ↔ Decimal ↔ Fractional ↔ Implied probability. One conversion, all four formats.
Open →Lock in profit on a futures or live bet. Get the exact stake to lay on the other side.
Open →Quantify your edge: +EV, break-even probability, and profit-if-win in one shot.
Open →Optimal bet sizing for long-term growth. Full Kelly and fractional Kelly supported.
Open →Spot risk-free arbs between two books. Get stakes, payout, and locked profit %.
Open →Ten more tools for specific situations and advanced math.
Calculate the bookmaker's commission on any market.
Track your sports-betting return on investment over time.
Convert any odds to its implied win probability.
The only honest signal of long-term sports-betting profitability.
Recommended stake based on bankroll, edge, and risk preference.
Compute payouts for round-robin parlays.
Calculate teaser payouts and key-number-aware strategy.
Quarter and half-line Asian handicap payout calculator.
Combined HT/FT bet payout calculator.
Liability and profit for lay bets on betting exchanges.
The single biggest separator between recreational bettors and long-term winners isn't picks — it's process. Sharp bettors run the math on every wager: implied probability, EV, Kelly stake, hedge price, arbitrage scan. The calculations take 30 seconds with the right tools and they tell you whether a bet is worth placing at all.
These six calculators cover every essential math problem in sports betting. They run entirely in your browser. Your inputs aren't logged. Bookmark this page and use them on every bet.