Use this free tool to instantly convert between decimal odds, fractional odds, American (moneyline) odds, and implied probability. Type into any field and every other format updates automatically. Includes a payout calculator so you can see your exact return for any stake.
How to Use This Converter
Type your odds into any of the four fields — decimal, fractional, American, or implied probability — and all other formats update instantly. You don't need to select a "from" format. Click any of the three example boxes above to load common UFC odds directly into the tool.
The payout calculator lets you enter any stake and instantly see your total return and profit. The break-even win rate shows the minimum win percentage needed to profit at those odds.
The Four Odds Formats Explained
Decimal odds
The dominant format in Europe, Australia, and on betting exchanges. The number represents your total return per unit staked — profit plus your stake back. Decimal 2.50 on a $100 bet returns $250 total ($150 profit + your $100 stake).
Calculation: Stake × Decimal = Total return
$100 × 2.50 = $250 return · $150 profit
Below 2.00 = favourite. Above 2.00 = underdog. Exactly 2.00 = evens.
Fractional odds
The traditional UK and Irish format. The left number is profit, the right is stake. Unlike decimal, your stake is not included in the return figure — it's returned separately on top.
Example: 6/4 means stake $4, win $6 profit, collect $10 total.
Convert to decimal: (numerator ÷ denominator) + 1 → (6÷4) + 1 = 2.50
American (moneyline) odds
Standard on US sportsbooks — DraftKings, FanDuel, ESPN BET. Positive odds show profit on a $100 stake. Negative odds show how much you must stake to profit $100.
+150 → profit $150 on a $100 stake · total return $250
-200 → stake $200 to profit $100 · total return $300
Implied probability
The win percentage built into the odds by the sportsbook. Comparing it to your own probability assessment is how you find value bets. Both sides of any market always sum to more than 100% because of the vig.
Decimal 2.50 → 1 ÷ 2.50 × 100 = 40.0%
-110 each side → 52.4% + 52.4% = 104.8% total · vig = 4.8%
Conversion Formulas
Every calculation this tool makes uses these exact formulas.
e.g. 1÷2.50×100 = 40%
e.g. (3÷2) + 1 = 2.50
e.g. 1+(150÷100) = 2.50
e.g. 1−(100÷−200) = 1.50
e.g. 100÷40 = 2.50
e.g. −100÷(1.50−1) = −200
Odds Conversion Table
Common UFC and MMA odds across all four formats. Favourites above the evens line, underdogs below.
| Fractional | Decimal | American | Implied probability |
|---|
Why Implied Probability Is the Number That Actually Matters
The format your sportsbook uses is just presentation. The number that determines whether a bet has value is the implied probability. Once you can translate any format into a percentage, you can make the only comparison that matters: does the market's implied probability match your own assessment?
If a UFC fighter is priced at +150 (40% implied) and your analysis says they win 52% of the time, you have a 12-point edge. That gap is where long-term profit lives. It is also the foundation of closing line value (CLV) — the metric that separates genuine bettors from lucky streaks.
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