MMA & UFC Odds Calculator
Free MMA and UFC betting tools: odds converter, parlay, hedge, no-vig, Kelly and expected value. Betting on boxing? Use the boxing odds calculator.
How to Use This Betting Odds Calculator
Six tools, one page. Convert a price between formats, price up a parlay, work out a hedge, strip the vig out of a line, size a bet with the Kelly Criterion, or check whether a number is worth betting at all.
⇄ Odds Converter
The Odds Converter instantly converts between American (moneyline), Decimal, Fractional, and Implied Probability formats. Type into any field and all others update in real time. Enter a bet amount to see your exact profit and total payout. American odds show favorites as negative numbers (e.g. -110 means you risk $110 to win $100) and underdogs as positive (e.g. +150 means a $100 bet wins $150).
🔗 Parlay Calculator
A parlay combines multiple bets into one wager where every leg must win. The upside is much larger payouts — the downside is higher risk. Our parlay calculator supports up to 12 legs in American, Decimal, or Fractional format. It shows you the combined parlay odds, implied probability, total payout, and profit if all legs hit. For worked UFC examples, what a canceled fight does to a ticket and why same-fight legs are priced differently, see the UFC parlay calculator.
🛡 Hedge Bet Calculator
Hedging means placing a bet on the opposite side of your original wager to guarantee a profit or minimize a loss. This is most common when you have a live parlay that has hit several legs and want to secure profit before the final leg. Enter your original bet and the opposing odds to see exactly how much to hedge and what you will profit either way.
📊 No-Vig Fair Odds Calculator
Every sportsbook builds a vig (also called juice or hold) into their odds, meaning the implied probabilities of both sides add up to more than 100%. The No-Vig Calculator strips out the bookmaker’s margin to reveal the true implied probabilities and what the fair odds should be without juice. A typical -110/-110 line carries about 4.8% vig.
📐 Kelly Criterion Calculator
The Kelly Criterion is a bankroll management formula that calculates the mathematically optimal percentage of your bankroll to bet given your edge. Enter your bankroll, your estimated win probability, and the bet odds — the calculator shows the recommended bet size. Most professional bettors use Half Kelly (50% of the full Kelly recommendation) to reduce variance while still growing their bankroll efficiently.
⚡ Expected Value (EV) Calculator
Expected Value tells you whether a bet is profitable over the long run. If your true win probability is higher than the implied probability baked into the odds, you have a positive expected value (+EV) bet. Enter your odds, your estimated win probability, and bet size to see your EV per bet and projected profit over any number of bets.
Frequently Asked Questions
What does -150 mean in sports betting?
A -150 line means you must bet $150 to win $100 in profit. The fighter or team at -150 is the favorite. The larger the negative number, the bigger the favorite. A -300 line means you are risking $300 to win $100.
What does +200 mean in MMA betting?
A +200 line means a $100 bet returns $200 in profit, plus your original $100 stake back, for a total of $300. The fighter listed at a positive number is the underdog. The larger the positive number, the bigger the underdog.
How do I calculate a parlay payout?
Convert each leg’s American odds to decimal odds, multiply them all together, then multiply by your stake. To convert American odds to decimal: for a positive line, divide by 100 and add 1 (so +200 becomes 3.0). For a negative line, divide 100 by the absolute value and add 1 (so -150 becomes 1.667). A three-leg parlay at -110 / -110 / -110 pays about +596, which is just under seven times your stake back. Use the parlay tab above to calculate any combination instantly.
How do I convert American odds to decimal odds?
For positive odds (underdogs): divide by 100 and add 1. Example: +250 becomes (250 / 100) + 1 = 3.50. For negative odds (favorites): divide 100 by the number and add 1. Example: -200 becomes (100 / 200) + 1 = 1.50. Decimal odds represent your total return per $1 wagered, including your stake.
What is implied probability in sports betting?
Implied probability is the win percentage the sportsbook’s odds suggest for a given outcome. For negative odds: implied probability = |odds| / (|odds| + 100). So -150 implies 60% (150 / 250). For positive odds: implied probability = 100 / (odds + 100). So +200 implies 33.3% (100 / 300). When your own estimated win probability is higher than the implied probability, you have a value bet.
What does it mean to bet on a 10-team parlay?
A 10-team parlay combines 10 individual bets into one wager. All 10 legs must win for the parlay to pay out. The upside is a much larger payout than any single bet. The downside is that one loss kills the entire ticket. Ten legs at -110 each pays about +64200, which is roughly 643 times your stake back, but the odds of hitting all ten are about 1 in 643. Use the parlay calculator above to model any combination and see the exact payout before placing a bet.
What is a hedge bet?
Hedging means betting the opposite side of an existing wager to guarantee a profit or reduce your risk. The most common scenario is a parlay down to its final leg: you have a large locked-in profit but one loss ends it. Betting the opposing side with the right stake locks in a guaranteed return regardless of outcome. The hedge calculator above shows exactly how much to wager to achieve equal profit on both sides, breakeven protection, or maximum profit for your risk tolerance.
What is no-vig pricing?
Every sportsbook builds a margin, called the vig or juice, into their odds so the house profits regardless of outcome. No-vig pricing strips that margin out to show what the true odds would be in a fair market. If a fight is listed at -130 / +110, the no-vig prices reveal each fighter’s actual implied probability with no house edge baked in. Comparing the no-vig price against the best available line tells you which side, if any, has positive expected value.
What is the Kelly Criterion?
The Kelly Criterion is a bankroll management formula that tells you the optimal bet size based on your statistical edge in a wager. It’s calculated as f = (bp – q) / b, where b is net decimal odds, p is your estimated win probability, and q is 1 – p. A negative result means there’s no edge, so skip the bet. Most professional bettors use Half Kelly or Quarter Kelly to reduce variance while still growing their bankroll efficiently over time.
What is expected value (EV) in sports betting?
Expected value measures whether a bet is profitable in the long run. A positive EV bet means you are getting better odds than the true probability warrants and should profit over a large sample. A negative EV bet means the house has the edge. EV is calculated as: EV = (probability of winning x profit) – (probability of losing x stake). Consistently finding and betting positive EV lines is the foundation of long-term profitable betting.
This calculator is for informational and entertainment purposes only and does not guarantee betting outcomes. You must meet the legal gambling age in your jurisdiction to wager. If you or someone you know has a gambling problem, call or text 1-800-MY-RESET (National Problem Gambling Helpline) for free, confidential help.