How Many Calories Are in Asparagus? | Real Serving Facts

The calorie counter on your phone makes roasted asparagus look like a rounding error. You load a plate, expecting the fibrous stalks to carry some kind of hidden energy penalty, but the total barely moves. It feels like a loophole in the basic rules of eating.

That intuition matches the data. Asparagus is genuinely one of the lowest-calorie vegetables in the produce aisle. A single spear holds about 3 calories. This article covers the exact calorie counts for raw and cooked asparagus, how those numbers change with preparation, and what those few calories actually deliver nutritionally.

Asparagus Calories by Serving Size

The base calorie number depends mostly on serving size and whether the asparagus is raw or cooked. A medium spear weighing roughly 16 grams contains just 3 calories raw.

Pour a full cup of raw asparagus pieces, about 134 grams, and you land at 27 calories. Cook it down — a half-cup of cooked asparagus at 90 grams — and you get about 20 calories. The difference comes from water loss during cooking, which concentrates the vegetable without adding energy.

Cooking method nudges the number slightly. Steaming or boiling adds nothing. Roasting with a drizzle of oil adds whatever oil you use. But the vegetable itself stays energetically lean, regardless of how you prepare it.

Why the Calorie Count Feels Misleadingly Low

The low calorie count surprises most people because asparagus feels substantial on the plate. How can something so fibrous and filling have so few calories? The answer comes down to its unique composition.

• High water volume: Asparagus is over 90% water, which adds bulk and weight without adding meaningful calories. Water fills your stomach without contributing energy.
• Significant fiber: A half-cup of cooked asparagus delivers 1.8 grams of fiber, helping you feel full longer — fiber slows digestion and smooths out energy release.
• Unusually high protein for a veggie: That same half-cup provides 2.2 grams of protein, more than many leafy greens, which supports satiety and helps maintain muscle mass.
• The chewing factor: The fibrous texture requires real chewing, which gives your brain time to register fullness signals from your stomach before you overeat.

This combination makes asparagus a powerful tool for anyone managing their weight. You get the sensory experience of eating a real, hearty vegetable for almost no caloric cost.

Macronutrient and Vitamin Breakdown

Those 20 to 27 calories per serving carry a surprising amount of nutrition. The same volume that keeps your calorie count low also delivers meaningful micronutrients that many other vegetables lack.

A half-cup of cooked asparagus provides 57% of the daily value for vitamin K, which plays a role in blood clotting and bone health. It also supplies 18% of the RDI for vitamin A and 12% for vitamin C. The USDA breaks down the exact numbers per spear in its calories per asparagus spear guide, confirming its low-calorie density alongside this nutrient profile.

Ten cooked shoots deliver close to 50% of the daily folate requirement, making asparagus a strong choice for anyone focused on cell growth and development. The folate content alone — roughly 225 micrograms per serving — sets it apart from most other common vegetables.

Serving Size	Weight	Calories
1 medium spear (raw)	16 g	3
1 cup raw	134 g	27
½ cup cooked (plain)	90 g	20
1 cup cooked (plain)	180 g	40
10 cooked shoots	~180 g	~40
100 g raw	100 g	20

These numbers assume no added fat or salt. A teaspoon of olive oil kicks the calorie total by about 40 calories per serving, so check your prep method if you are counting precisely.

How Preparation Changes the Count

The base calorie count changes quickly once you add cooking fats, sauces, or wrappers. Here is what typical additions do to a half-cup serving of cooked asparagus.

1. Steamed or grilled plain: Stays at 20 calories. This is the purest way to eat it if you are counting strictly and want the vegetable’s natural flavor.
2. Roasted with olive oil: A single tablespoon of olive oil drizzled over a batch adds roughly 120 calories total. Per serving, that could mean 40 to 60 extra calories depending on how much clings to each stalk.
3. Wrapped in bacon or prosciutto: One slice of bacon adds about 40 to 50 calories per spear. Prosciutto is slightly lower, around 30 calories per slice, depending on thickness.
4. Served with hollandaise or butter sauce: A tablespoon of melted butter adds about 100 calories. Hollandaise is similar, around 80 to 100 calories depending on the recipe and fat content.

The vegetable itself remains low-calorie in every preparation. The calories you add come almost entirely from the fats and meats you pair with it, not from the asparagus.

Asparagus vs Other Low-Calorie Vegetables

How does asparagus rank against other common low-calorie vegetables? It holds its own, especially in certain key nutrients that support overall health.

Asparagus is slightly higher in fiber and folate than broccoli or green beans. Broccoli, by contrast, offers more vitamin C per serving. Spinach is lower in calories overall but also lower in texture and fiber density.

NC State Extension provides a full nutrient profile for cooked asparagus, noting its cooked asparagus calories as well as its vitamin and mineral density. The main takeaway is that few vegetables give you this much folate, vitamin K, and fiber for such a low total energy cost.

Vegetable (1 cup raw)	Calories	Key Nutritional Highlight
Asparagus	27	High folate & vitamin K
Broccoli	31	High vitamin C & vitamin K
Spinach	7	High iron & vitamin A
Green beans	31	Good fiber & vitamin C

The Bottom Line

Asparagus is a nutrient-dense choice with a genuinely low calorie profile. A half-cup of cooked asparagus delivers fiber, protein, and a strong dose of vitamins K and A for just 20 calories. It can support weight management and overall nutrition tracking without straining your daily energy budget.

For personalized dietary planning — especially if you are managing specific health conditions or tracking macronutrients precisely — a registered dietitian can help you fit asparagus and other vegetables into your daily targets without guesswork.