Free Betting Tools
Five professional-grade calculators built for bettors who treat sports betting as a craft. No sign-up required, just open and use.
When two sportsbooks price the same game differently enough that the implied probabilities total under 100%, a correctly split stake covers every outcome. This calculator finds the exact stake on each side, 2-way and 3-way markets, and shows the margin before execution risk.
Add 2 to 12 legs, mix any odds formats, and instantly see the combined odds, exact payout, and true win probability. Includes a warning when parlays become lottery tickets.
Enter a number in any format (American, decimal, fractional, or implied probability) and see it instantly converted to all others. Includes a reference table of 15 common lines.
Already have a bet running and want to hedge? Find the exact amount to bet on the other side to guarantee profit (or minimize loss). Supports free bet hedges and three strategic modes.
Input your estimated win probability and the book's offered odds. The calculator shows expected value per $100 wagered, your edge percentage, and Full / Half / Quarter Kelly bet sizes with dollar amounts.
Professional sports bettors don't wing it, they quantify every decision. These calculators make that accessible.
Before evaluating any bet, convert the odds to implied probability. If you think a team has a 55% chance of winning but the odds imply 52%, you have a 3% edge.
The Kelly Criterion tells you what percentage of your bankroll to bet based on your edge. Betting too much relative to edge destroys bankrolls. Kelly keeps you in the game long-term.
When the combined implied probability from two books totals under 100%, the prices form a theoretical arbitrage. The calculator returns the exact stake split, but the math is only the first half; both bets still have to be accepted at those prices.
If a parlay leg or futures bet is still live, an opposing bet reduces the exposure. The hedge calculator shows the stake for a given target, whether that leaves a gain depends entirely on the two prices involved.
Calculators are only as powerful as your understanding of the underlying strategy.
The formula, the American-to-decimal conversions, and worked 2-leg and 3-leg examples.
Combined price, implied probability and payout for every leg count at −110 and at even money.
Why one book almost never prices both sides under 100%, and how arbitrage differs from a middle or a hedge.
What controls the frequency, how long they last, and why no universal daily number is reliable.
What ±1.5 means, how overtime settles it, and how puck-line prices relate to the moneyline.
How arbs form, how to find them, which books to use, and how to manage your accounts for longevity.
Why CLV predicts long-term profitability better than your win/loss record, and how to track it.
Line movement tracking, opening-to-closing history and multi-book odds comparison, plus what CLV and arbitrage actually mean.