How to Convert UFC Odds to Implied Probability: Examples

Quick answer

UFC odds convert into implied probability with two simple formulas. For negative American odds, divide the number's absolute value by that value plus 100, while positive odds use 100 divided by the odds plus 100. A -200 favorite implies 66.7%, while a +200 underdog implies 33.3%.

Those are break-even rates at the quoted prices, not clean forecasts, and sportsbook margin usually pushes the two fighters' combined percentage above 100%. Estimate a no-vig market probability by dividing each raw percentage by their combined total.

Data snapshot: Exact odds formulas and one DraftKings UFC 330 price snapshot accessed through RotoWire on July 27, 2026. Market context comes from a 2026 study of 4,244 MMA observations.

How do UFC odds encode probability?

Every UFC moneyline answers two questions: how much a winning ticket returns, and how often that side must win for the price to break even.

Implied probability translates the second answer into a percentage, making UFC favorites and underdogs easier to compare with a statistical model.

The percentage isn't a promise from the sportsbook because it is a price with margin built into it. The distinction matters whenever you compare UFC odds with an AgentMMA prediction.

What do plus and minus UFC odds mean?

American odds use a $100 reference point, and CBS Sports explains the convention with a standard UFC moneyline.

A negative price shows the risk needed for $100 profit, and at -150 a $150 stake returns $250 when it wins. That total contains the original $150 stake and $100 profit.

A positive price shows the profit from a $100 stake, and at +150 a winning $100 stake returns $250 in total. The profit is $150.

The sign describes payout, not certainty: a negative number usually marks a favorite, while a positive number marks an underdog. Near-even markets can price both sides below zero, so neither side is guaranteed.

How do you convert American UFC odds into a percentage?

Use the absolute value of a negative number because keeping the minus sign inside the fraction is a common calculator mistake.

For negative odds:

implied probability = |odds| / (|odds| + 100)

For positive odds:

implied probability = 100 / (odds + 100)

Here are the most useful reference prices:

For -150, the absolute value is 150, and the calculation 150 / 250 equals 60.0%.

For +150, the calculation 100 / 250 equals 40.0%. In a fair market with no margin, -150 and +150 would therefore form a 60-40 pair.

How do decimal and fractional UFC odds convert?

Decimal odds include the returned stake, so divide one by the decimal price to get raw implied probability.

At 2.50, the calculation is 1 / 2.50 = 40.0%, and a $100 winning stake returns $250, including $150 profit.

Fractional odds show profit relative to stake, and for odds written as a/b, use b / (a + b).

At 3/2, the calculation is 2 / (3 + 2) = 40.0%. The same price appears as +150, 2.50 or 3/2, with only the display changing.

Why do UFC implied probabilities add up to more than 100%?

The prices include vig, or juice, and their combined raw probabilities create the overround. Raw implied probabilities are break-even rates for each offered price, so they aren't designed to sum to 100%.

In a common -110 versus -110 market, each side converts to 52.38%. Together they make 104.76%, leaving 4.76 percentage points above 100%.

That 4.76-point excess is the overround, but it isn't automatically the sportsbook's exact profit rate. Actual hold depends on how money is split, the prices accepted and how the margin is distributed.

A single fighter's raw implied probability can therefore misstate the market view, so you need both sides from the same sportsbook at the same moment.

How do you remove the vig from a UFC moneyline?

The simplest method is proportional normalization: convert both prices into raw percentages, add them, then divide each percentage by that sum.

no-vig probability = raw implied probability / total raw probability

Fighter A may be 60% raw while Fighter B is 45% raw. Their 105% total produces no-vig estimates of 57.1% and 42.9%.

Those estimates sum to 100%, making them more useful for comparing a market view with a model forecast.

Although "no-vig" doesn't mean "true," Erik Štrumbelj tested several ways to recover probability forecasts from bookmaker odds. His 2014 paper found that the chosen adjustment method can affect accuracy.

Proportional normalization can miss unequal margin between favorites and longshots.

What do the Makhachev-Garry odds imply?

UFC 330 gives us a current, concrete example because the UFC lists welterweight champion Islam Makhachev against Ian Machado Garry for August 15, 2026.

On July 27, RotoWire displayed DraftKings prices of Makhachev -345 and Machado Garry +275, so convert each side before reading the market.

The raw percentages total 104.2%, so the overround is 4.2 percentage points. After proportional normalization, the market estimate becomes about 74.4% for Makhachev and 25.6% for Machado Garry.

That doesn't mean Makhachev wins 74 times in a future set of 100 identical fights because those fights can't exist. The two same-book prices, after a simple margin adjustment, instead encode roughly a 74-26 market split.

Prices can move before fight night, while other books may post different numbers. Always date the quote and keep both sides together.

Which probability should you compare with an AgentMMA model?

Use the number that answers your exact question.

Raw probability handles break-even math, no-vig probability gives a cleaner market benchmark, and model probability offers an independent estimate.

Don't label the gap between model and market as guaranteed value because model error, line movement and uncertainty remain. A one-point gap may be rounding noise, and even a two-point gap can be too small to trust.

What does a UFC line move tell you?

A line move tells you that the available price changed, but it does not reveal one single cause.

A price can move after wagers or new injury information, and it can also reflect a sportsbook changing its view.

Convert both old and new prices to see the change: moving from -200 to -250 raises raw implied probability from 66.7% to 71.4%. That is a 4.8-point move, not a 50-point move.

Don't compare a favorite from one book with an underdog from another when estimating vig because that creates a synthetic market no sportsbook offered.

How does implied probability relate to break-even value?

Break-even probability is the long-run win rate among bets settled as wins or losses.

Across 100 settled $100 bets at +150, 40 wins produce $6,000 in profit and 60 losses lose $6,000.

Real UFC fights aren't repeatable trials, and your probability estimate can be wrong, so this example only explains the price.

Miller and Nichols studied MMA betting-market efficiency and found the market was largely efficient. Their out-of-sample tests produced few statistically significant positive returns, which warns against treating a small model gap as easy money.

Which UFC odds mistakes cause the most confusion?

• Reading -200 as a 200% chance. It means 66.7% raw implied probability.
• Forgetting that return includes your original stake. Profit and total payout differ.
• Treating one side's raw percentage as a no-vig market forecast.
• Mixing prices from different sportsbooks, dates or market types.
• Calling a favorite a lock because its price is negative.
• Comparing a method-of-victory prop with a fight moneyline. They price different events.
• Saying probability rose by 20% when it rose by 20 percentage points.

How solid is this data?

The conversion formulas are exact: if the input price is correct, its raw implied probability and payout are fixed by arithmetic.

The UFC 330 example is less permanent because it is one DraftKings snapshot accessed through RotoWire on July 27, 2026. It is not a closing line, consensus price or prediction of the result.

The proportional no-vig method is also an estimate that forces the two probabilities to total 100% while assuming proportional margin. Štrumbelj's research shows other adjustment methods can perform better in some bookmaker datasets.

The MMA efficiency paper adds broad context, not a conversion rule, because market quality can vary by promotion, timing, sportsbook and bet type. Thin props may behave differently from major UFC moneylines.

The strongest part is the math, while the weakest is any claim that the adjusted percentage reveals an unknowable true chance.

FAQ

What does -200 mean in UFC odds?

At UFC odds of -200, risking $200 returns $100 profit, and raw implied probability is 200 / (200 + 100), or 66.7%.

What does +150 mean in UFC odds?

At +150, a winning $100 stake returns $250 with $150 profit, and raw implied probability is 100 / (150 + 100), or 40.0%.

Why do UFC implied probabilities exceed 100%?

The two raw percentages total more than 100% because sportsbook prices include vig. The amount above 100% is the market's overround, not an extra possible fight outcome.

How do you calculate no-vig UFC probability?

Convert both fighters' odds into raw implied probabilities, add them, then divide each fighter's percentage by the combined total. The two adjusted figures will sum to 100%.

Are UFC odds the same as a prediction?

No: UFC odds are market prices that determine payouts and break-even rates. A no-vig conversion estimates the market view, while a prediction model makes a separate probability forecast.