How to calculate fair odds for the 2026 Kentucky Derby

The wide-open nature of the 2026 Kentucky Derby (G1) makes calculating a mathematically sound fair odds line more important than ever.

A fair odds line converts your handicapping opinions into tangible numbers you can compare against the post-time odds to determine which Kentucky Derby horses are worth betting.

I’m going to walk you step-by-step through my process for creating a 2026 Kentucky Derby fair odds line. Whether you agree or disagree with my conclusions, you can follow my approach to calculate your own fair odds and increase your chances of making strong bets on the first Saturday in May.

Defining a fair odds line

A fair odds line is simple. It shows you the minimum odds you should accept when betting a horse to win, based on how well you like your chances. If you believe a horse has a 20% chance of winning, the fair odds are 4-1, which represents one win for every four losses—a 1 in 5 (or 20%) chance of winning.

The table below shows common odds and the chances of winning they represent:

Calculating a fair odds line for the 2026 Kentucky Derby

Calculating a fair odds line for the 2026 Kentucky Derby isn’t difficult. You must assign win probabilities to all 20 horses in the field, and these probabilities must add up to 100%, give or take a few tenths of a percentage.

I recommend starting with longshots. Pick out the 10 or so horses you believe have little to no chance of winning the Kentucky Derby, and assign them win probabilities anyway. I like their aggregate win chances to total around 20%, since roughly one out of five Kentucky Derby winners over the last 20-30 years were horses I wouldn’t have considered betting.

This year, the horses in my longshots category are Emerging Market, Fulleffort, Incredibolt, Pavlovian, Stark Contrast, Wonder Dean, Albus, Chip Honcho, Right to Party, and Six Speed. I’ve assigned them odds ranging from 40-1 to 100-1. Their aggregate chance of winning comes out to 17.16%; I’m fine with it being a little lower than 20% since quality runs deep at the top of this year’s Kentucky Derby field.

If any of these longshots start at meaningfully higher prices than the fair odds I’ve assigned, they are worth considering for win bets.

Next, consider the horses you view as win contenders. Florida Derby (G1) winner Commandment is my narrow top choice to win the 2026 Kentucky Derby, but I won’t be surprised at all to see five other horses visit the winner’s circle. Eye-catching Arkansas Derby (G1) winner Renegade, Japan’s unbeaten Fukuryu S. winner Danon Bourbon, runaway Blue Grass (G1) winner Further Ado, and Florida Derby 2-3 finishers The Puma and Chief Wallabee are others I would consider betting at the right price.

Ultimately, I assigned these six horses win chances ranging from 14.29% to 10%, which translates into fair odds from 6-1 to 9-1. I’m skeptical whether I’ll see such high odds come race day. Nick Tammaro, the morning-line oddsmaker for Churchill Downs, speculates that Renegade will be 9-2, Commandment 5-1, and Further Ado 6-1. Those prices are too low according to my fair odds.

I rounded out my fair odds by assigning 3.85% win chances to Golden Tempo, Potente, Silent Tactic, and So Happy, which equates to 25-1 odds. Potentially, one or more of these four could start at higher than 25-1, making them interesting from a win bet standpoint.

One horse I’m certain will offer fair odds is Danon Bourbon. He’s unbeaten and unchallenged in three starts in Japan, and he boasts a combination of tactical speed and a strong finishing kick. Despite his impressive credentials, Danon Bourbon isn’t receiving much hype, and I think there’s a good chance he’ll start at 15-1 or so.

This is where a fair odds line becomes so valuable in a wide-open race. My top choice might be Commandment, but if I’ve assessed him correctly, then he isn’t a great bet at under 6-1. Danon Bourbon, on the other hand, should offer excellent value. Given the expected odds, I’m better off betting Danon Bourbon than Commandment in the win pool.

One final note: my fair odds pertain to win chances only. Even if a horse is too short a price in the win pool, they can still be worth playing in exotic wagers like the exacta and trifecta.

Good luck!