Free professional-grade calculators for expected value, fair odds, parlay building, and bankroll sizing. The same math sharp bettors use β no signup, no fluff.
Enter the odds your sportsbook is offering and the true win probability (use the No-Vig tool below to find it from a sharp book's line). If EV is positive, the bet makes money long-term.
Sportsbooks bake a fee (the "vig") into every line. Enter both sides of a market β ideally from a sharp book like Pinnacle β and this strips the vig to reveal the fair probability of each side. Feed that number into the EV calculator.
Add each leg with the odds you're offered and its true win probability. EdgeCalc multiplies the legs to show the parlay's real chance of hitting, what fair payout would be, and whether the parlay is +EV β plus what the book should pay vs. what it's offering. Only stack legs that are +EV on their own, and check the correlation guide for combos that boost each other.
Pulls live player props from FanDuel, DraftKings, BetMGM, ESPN BET, and Caesars, plus pick'em lines from PrizePicks, Underdog, DraftKings Pick6, and Betr Picks. EdgeCalc strips the vig from every book's price, averages them into a consensus true hit probability for each prop, and ranks the whole board from highest to lowest hit rate. A live board lists every player the books have posted across every game and prop type β finished games automatically drop off with every refresh, and each row shows its game's start time or a π΄ LIVE badge. Use the tabs to browse the full consensus board, flip to your sportsbook to see its exact lines and prices, or switch to the Player Pick'em tab and pick your platform. Live data needs a free API key from the-odds-api.com (takes 1 minute, 500 free credits/month) β or hit Load sample data to see exactly how it works right now.
Once you've found a +EV bet, Kelly tells you how much of your bankroll to stake to grow it fastest without going broke. Most pros use quarter or half Kelly to smooth out variance.
A $50 bonus bet is not $50 β unless you convert it. The pro strategy: place the bonus on a longshot at one book, hedge the other side with cash at another book, and lock in the same profit no matter who wins. 70%+ conversion is excellent; longer odds usually convert better because the bonus (which doesn't return its stake) does more of the work.
Type odds in any one format β the other formats and the implied probability update instantly.
Parlay legs aren't always independent. When one leg hitting makes another more likely to hit, the combo is positively correlated β the parlay's true probability is higher than just multiplying the legs, which can create hidden value (books price popular ones into same-game parlays). Negatively correlated legs fight each other and are almost always bad parlays.
Expected value is the average amount you'd win or lose on a bet if you could place it thousands of times. A +EV bet pays out more than the true probability says it should β the only kind of bet that makes money long-term. Sportsbooks profit because most bets are -EV after the vig; finding +EV means finding lines where the book's price is wrong.
The formula: EV = (win probability Γ profit if you win) β (loss probability Γ stake). The hard part isn't the math β it's estimating the true probability. The standard approach is to take the no-vig line from the sharpest market available and treat that as the truth.
Use the No-Vig calculator with both sides of the line from a sharp, high-limit sportsbook. Removing the vig from a sharp book's market is the most reliable free estimate of a bet's real probability. Then check what a softer book is offering β if they're paying more than the fair odds, you've found +EV.
Parlays made of -EV legs compound the house edge and are among the worst bets in sports. But a parlay of genuinely +EV legs compounds your edge instead. The builder above shows the fair payout for your legs β if a book offers more than fair, the parlay is +EV.
Full Kelly maximizes growth but assumes your probability estimate is perfect. Since it never is, betting half the Kelly stake gives up very little growth while cutting the swings dramatically. Overbetting a wrong edge is how bankrolls die.
Yes β every tool on EdgeCalc is free with no signup.