Flax Protein Per 100g Calculator

Flaxseed is one of the most protein-dense plant foods in the pantry, delivering about 18.3 grams of protein per 100 grams. While that number sounds impressive, most people eat flax in small amounts — a sprinkle on yogurt, a tablespoon in smoothies, or a few grams in baked goods. This Flax Protein Per 100g Calculator instantly converts your serving size into actual protein grams, so you can track your daily intake accurately without guessing.

Use it for whole seeds, ground flax meal, or even flaxseed oil (which contains zero protein). The calculator also shows the calorie contribution from protein and lets you override the default protein value with a brand-specific figure from your package label. Whether you're following a plant-based diet, counting macros, or simply curious about flax nutrition, this tool gives you a clear, evidence-based answer in seconds.

⚙️ Enter Your Serving

Amount

Flax product

Protein per 100 g (optional)

Leave blank to use the USDA default.

Quick amounts:

📊 Protein Results

Protein in your serving—

Serving converted to—

Protein per 100 g—

Calories from protein—

How It Works

The calculation follows a simple three-step process. First, your serving size is converted to grams if you entered it in tablespoons or ounces. Second, the protein content is scaled from the per-100-gram reference value using the formula: protein (g) = serving weight (g) ÷ 100 × protein per 100 g. Third, the protein calorie contribution is estimated with the standard Atwater factor of 4 kcal per gram of protein — the same conversion used on nutrition labels and in food databases around the world.

The default protein values come from the USDA FoodData Central database. Whole flaxseed and ground flaxseed both contain about 18.3 g of protein per 100 g, while flaxseed oil contains 0 g because the pressing process separates the oil from the protein-rich meal. The volume-to-weight conversions built into the calculator (1 tbsp whole = 10.3 g, 1 tbsp ground = 7 g, 1 tbsp oil = 13.6 g) are USDA reference weights, so the results stay consistent with official nutrition data.

How to Use This Tool

Using the calculator takes only a few seconds. Type the amount you ate, select the matching unit — grams, tablespoons, or ounces — and choose the flax product that matches what you actually consumed: whole seeds, ground meal, or oil. If your package label lists a protein value that differs from the default (for example, a brand that specifies 20 g per 100 g), enter it in the optional custom field and the calculator will use your number instead. Press Calculate Protein to see the result along with a step-by-step breakdown of every conversion.

Tip: The quick-amount buttons below the inputs instantly fill common portions like 28 g (about 1 oz) or 1 tablespoon, which saves time when you are logging multiple meals. Because flaxseed is usually eaten in small amounts, the protein per serving often looks modest — but it adds up quickly when combined with oats, yogurt, or a smoothie base.

Worked Examples

Example 1: You stir 2 tablespoons of ground flaxseed into your morning oatmeal. Each tablespoon weighs 7 g, so the serving is 14 g. Protein = 14 ÷ 100 × 18.3 = 2.56 g, which supplies about 10 kcal from protein. The calculator performs both conversions for you — first tablespoons to grams, then grams to protein.

Example 2: A bread recipe calls for 85 g of whole flaxseed. Protein = 85 ÷ 100 × 18.3 = 15.6 g, and calories from protein = 15.6 × 4 = 62 kcal. Since the loaf is divided into 10 slices, each slice would contribute roughly 1.6 g of protein from the flaxseed alone — a detail worth knowing when you are balancing the macros of a homemade loaf.

Sample Portions

The table below shows typical serving sizes with their approximate weights and protein content based on the 18.3 g per 100 g default.

Portion	Approx. weight	Protein
1 tbsp ground flax	7 g	1.3 g
1 tbsp whole flax	10.3 g	1.9 g
2 tbsp ground flax	14 g	2.6 g
28 g (1 oz)	28 g	5.1 g
50 g	50 g	9.2 g
100 g (3.5 oz)	100 g	18.3 g

Real-World Applications

Flaxseed protein is a practical piece of plant-based meal planning. Because flax is also a source of omega-3 fatty acids and dietary fiber, a serving contributes several nutrients rather than protein alone. Bake it into muffins and crackers, blend it into smoothies, or sprinkle it over salads and roasted vegetables. Knowing the exact protein per 100 g also helps when converting recipe nutrition estimates or comparing flax with other seeds such as chia, hemp, or pumpkin, each of which has a different protein density. Athletes and macro counters can use this tool to fine-tune daily targets without weighing every sprinkle.

Common Mistakes to Avoid

Don't mix up whole and ground flax tablespoon weights. A tablespoon of whole flaxseed weighs 10.3 g, while a tablespoon of ground flax weighs only 7 g because grinding introduces air and changes the density in the spoon. Swapping one for the other alters both the serving weight and the protein total, so always select the correct product type before calculating.

Check your package label before assuming 18.3 g. Some products blend flax with other seeds, add hulls, or include fortifiers that shift the protein density. The custom field exists precisely for this reason — when a label is available, prefer the label.

Frequently Asked Questions

Is flaxseed a complete protein? No. Like most plant foods, flaxseed is low in lysine, so it is not a complete protein on its own. Pair it with legumes, rice, or other grains across the day to cover the full amino acid profile.

Why does flaxseed oil show zero protein? Protein is bound in the fibrous, water-soluble parts of the seed. During cold pressing, the oil is separated from the meal, so the pure oil fraction contains no protein by definition.

Does grinding flaxseed change its protein content? No. Ground flaxseed has the same protein per 100 g as whole seeds — 18.3 g — because grinding only changes the physical form. What changes is the volume-to-weight ratio: a tablespoon of ground flax simply weighs less than a tablespoon of whole seeds. The NIH Office of Dietary Supplements notes that grinding improves digestion and nutrient absorption without altering the macronutrient content.