MMA & UFC Odds Calculator
Free betting tools for MMA, UFC, Boxing, NFL, NBA & all sports. Updated 2026.
How to Use This Betting Odds Calculator
Our free betting calculator suite gives you everything you need to make smarter bets. Whether you’re converting American odds to decimal, building a multi-leg parlay, locking in a hedge, or calculating the Kelly Criterion for optimal bet sizing — all six tools are right here in one place.
⇄ 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.
🛡 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 4.5% 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 favourite. The larger the negative number, the bigger the favourite. 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 roughly +595 — about a 6x return on your stake. 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 (favourites): 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 roughly +6000, a 61x return, but the probability of hitting all ten is around 1 in 62. 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 bet-sizing formula that calculates the optimal percentage of your bankroll to wager based on your edge. The formula is: f = (bp – q) / b, where b is net decimal odds, p is your estimated win probability, and q is 1 – p. If the math returns a negative number, there is no edge and you should not bet. Most professional bettors use Half Kelly or Quarter Kelly to reduce variance while still growing a 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.