Written by CalorieData Nutrition TeamReviewed by a Registered DietitianLast Updated: March 2026
Data from USDA FoodData Central | Editorial guidelines

Calories in Flaxseed

Flaxseed contains 534 calories per 100g (53 cal per 1 tablespoon). High in protein with 18g per 100g. Excellent source of fiber with 27g per 100g.

Get the complete nutrition breakdown, macros, serving sizes, and health benefits below.

Nutritional Highlights

🥩

Good Protein Source

18g protein per 100g

🌾

High Fiber

27g fiber per 100g

🍬

Low Sugar

Only 1.6g sugar per 100g

Nutrition Facts

Per 100g serving

Calories534
Total Fat42g
Total Carbohydrate29g
Dietary Fiber27g
Sugars1.6g
Protein18g
Sodium30mg

Macronutrient Distribution

Protein18g (13%)
Carbohydrates29g (22%)
Fat42g (71%)

Calories by Serving Size

100 grams534 cal
1 tablespoon (10g)53 cal
2 tablespoons (20g)107 cal
1/4 cup (42g)224 cal
1 ounce (28g)150 cal

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About Flaxseed Nutrition

Flaxseeds (also called linseeds) are tiny nutritional powerhouses that have been cultivated for over 6,000 years. These small brown or golden seeds are among the richest plant sources of omega-3 fatty acids and contain exceptional amounts of fiber and lignans. Flaxseeds have gained popularity as a superfood for heart and digestive health.

With 534 calories per 100 grams, Flaxseed provides 18g of protein,29g of carbohydrates, and 42g of fat.

Macronutrient Breakdown

  • Protein: 18g - 13% of calories
  • Carbohydrates: 29g - 22% of calories
  • Fat: 42g - 71% of calories

Health Benefits of Flaxseed

  • Richest plant source of alpha-linolenic acid (ALA) omega-3 fatty acids
  • Exceptionally high in both soluble and insoluble fiber (27g per 100g)
  • Contains lignans with antioxidant and phytoestrogen properties
  • High-quality plant protein with 18g per 100g
  • May help lower cholesterol and support heart health
  • Supports digestive regularity and gut health

How to Eat Flaxseed

Ground flaxseed is better absorbed than whole seeds. Add to smoothies, oatmeal, yogurt, or baked goods. Use flax eggs (1 tbsp ground flax + 3 tbsp water) as a vegan egg substitute. Sprinkle on salads or mix into homemade energy bars. Start with 1 tablespoon daily and increase gradually to avoid digestive discomfort.

Selection and Storage

Whole flaxseeds store for up to a year in a cool, dark place. Ground flaxseed spoils quickly due to oils - store in the refrigerator or freezer for up to 3 months. Buy whole seeds and grind small batches as needed. Golden and brown flaxseeds have similar nutrition. Avoid rancid-smelling flaxseed.

Dietary Considerations

Flaxseeds are high in calories (534 per 100g) due to healthy fats, so portion control matters. They're naturally gluten-free, vegan, and keto-friendly. The high fiber may cause bloating initially - increase intake gradually. Drink plenty of water when consuming flaxseed. Those on blood thinners should consult their doctor due to omega-3 content.

Frequently Asked Questions About Flaxseed

How many calories are in a tablespoon of flaxseed?

One tablespoon of whole flaxseed (about 10g) contains approximately 55 calories. Ground flaxseed is slightly more calorie-dense at about 37 calories per tablespoon (7g) because it's more compact. Despite being calorie-dense, flaxseeds are highly nutritious.

Is flaxseed good for weight loss?

Yes, flaxseed can support weight loss despite being calorie-dense. Its high fiber content (27g per 100g) promotes fullness and satiety. The soluble fiber forms a gel that slows digestion, helping you feel full longer. Studies suggest 2-3 tablespoons daily may help reduce body weight.

Should I eat flaxseed whole or ground?

Ground flaxseed is recommended because whole seeds often pass through the digestive system undigested. Grinding breaks the hard outer shell, allowing your body to absorb the omega-3s, fiber, and lignans. Grind fresh or buy pre-ground and store in the freezer.

How much flaxseed should I eat daily?

The recommended amount is 1-2 tablespoons (10-20g) of ground flaxseed daily, providing 55-110 calories. This amount delivers significant omega-3s and fiber without excessive calories. Start with 1 teaspoon and gradually increase to avoid digestive issues.

What are the side effects of eating too much flaxseed?

Consuming too much flaxseed (more than 5 tablespoons daily) may cause bloating, gas, abdominal pain, or diarrhea due to high fiber content. The omega-3s may interact with blood thinners. Always drink plenty of water with flaxseed, as fiber absorbs liquid and may cause constipation if you don't stay hydrated.

Is flaxseed better than chia seeds?

Both are excellent superfoods with different strengths. Flaxseed has more omega-3s (22.8g vs 17.8g per 100g) and is cheaper. Chia seeds have more fiber (34g vs 27g) and don't need grinding. Both support heart health, digestion, and weight management. Consider including both in your diet.

Quick Nutrition Facts

CategoryNuts & Seeds
Calories/100g534
Protein18g
Carbs29g
Fat42g

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Data Accuracy Note: Nutrition values are based on USDA FoodData Central laboratory analysis. Actual values may vary based on growing conditions, preparation methods, and specific product brands. Values are rounded to one decimal place.