Onion Calories and Macros — Nutrition Facts per 1 medium (110g)

Onion contains 44 calories per 1 medium (110g), with 1.2g of protein, 10.2g of carbs, and 0.1g of fat. Here's the full nutrient breakdown — sourced from USDA FoodData Central — and how it fits into common tracking goals.

Onion nutrition facts

*Percent Daily Values are based on a 2,000-calorie diet. Source: USDA FoodData Central.

How does onion fit your goals?

Onion is a carb-dominant food, with 10.2g of carbohydrate per 1 medium (110g). That makes it a useful pre- or post-training fuel source, especially for endurance work or higher-volume strength sessions. If you're tracking for fat loss, the lever isn't avoiding carbs — it's portioning them around the parts of your day where the energy is actually used.

Diet-wise, onion fits low-carb and vegan and vegetarian eating patterns.

How onion compares to other vegetables

Tracking onion in Bento Bunny

Logging foods like onion manually means digging through a database, picking the right entry, and adjusting the serving size — multiple taps per meal. With Bento Bunny's AI photo tracking, you snap one picture and the macros land in your daily total automatically. For onion specifically, the model recognises typical portion sizes well, so the numbers above will land within a few percent of what you'd get from manual weighing.

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Browse all vegetables in the food database.