How Many Carbs in Bourbon? What Cyclists Actually Need to Know

Nutritional info on spirits has gotten confusing with all the fitness app tracking and keto diet claims flying around. As someone who pays attention to what goes into the body around training, I’ve learned what the numbers actually mean for bourbon specifically. Short answer: not much. Here’s the longer version.

What Bourbon Is Made Of

Bourbon is at least 51% corn, with rye, barley, and sometimes wheat rounding out the mash bill. Corn is high in carbohydrates in its raw state — but that’s before fermentation does its work.

What Fermentation Does to the Carbs

During fermentation, yeast converts the sugars from the grain mash into alcohol and carbon dioxide. The yeast is thorough. By the time fermentation is complete, most of the carbohydrates have been transformed. Distillation then separates the alcohol from everything else, further stripping out residual non-volatile compounds. What ends up in the bottle has lost nearly all of the original carbohydrate content from the grain.

The Actual Numbers

A standard 1.5-ounce serving of bourbon contains around 0-1 gram of carbohydrates. Probably should have just led with that number, honestly, because that’s the answer most people are looking for. The exact figure varies slightly by brand. Unflavored, straight bourbon consistently lands at the low end of that range. Flavored bourbons with added sweeteners add carbs post-distillation — check labels on those.

How Bourbon Compares to Other Spirits

That’s what makes distilled spirits endearing to us lower-carb drinkers — the fermentation and distillation process strips carbs from almost all of them:

• Vodka: 0-1 gram per serving
• Rum: Unflavored, 0-1 gram per serving
• Gin: 0-1 gram per serving
• Tequila: Pure agave tequila, about 0-1 gram per serving

The spirit itself is rarely the carbohydrate problem in a drink.

The Mixer Problem

Straight bourbon: 0-1 gram of carbs. Bourbon and cola: up to 20 grams, depending on the cola and the pour size. The mixer is where the carbs come from, not the whiskey. I’m apparently someone who tracks macros seriously around training, and sugar-free mixers work for me while regular cola never quite does when I’m in a deficit. Club soda, diet ginger beer, or just neat or on the rocks keeps the carb count at essentially zero.

Low-Carb Bourbon Drink Options

• Bourbon and Club Soda: Adds zero carbs. Add bitters for complexity without sugar.
• Old Fashioned (modified): Use a sugar substitute instead of simple syrup to cut the carb count significantly while keeping the cocktail profile.
• Whiskey Sour (modified): Fresh lemon juice plus a sugar alternative keeps this manageable on a low-carb day.

Where This Fits for Cyclists

For riders on low-carb eating plans or anyone tracking macros around training, straight bourbon is about as low-impact as alcoholic beverages get. The alcohol content still affects recovery — alcohol interferes with protein synthesis and sleep quality, both of which matter for adaptation after hard rides. Moderate consumption, timed away from training, is the relevant context here. The carb count is essentially a non-issue; the alcohol itself is the only variable worth tracking for athletic purposes.

The Bottom Line

Bourbon has 0-1 gram of carbs per 1.5-ounce serving. Flavored variants may have more. Mixers are where the carb count grows. Understand the context, make choices that fit your goals, and don’t worry about the whiskey itself disrupting a low-carb approach.