Sunflower seeds, kernels, and sunflower seed butter pack a surprising amount of plant protein into a small serving. This calculator converts any amount of sunflower product you actually eat into protein per 100 grams and into a full gram-and-calorie breakdown, so you can compare seeds, roasted kernels, hulled hearts, and sunflower butter on the same scale.
Enter the weight of your portion, pick the sunflower form, and optionally add oil, salt, or roasting notes. The tool returns protein per 100 g, total protein in your serving, calories from protein, and how that serving stacks against a typical 50 g daily plant-protein target. It is built for meal preppers, vegetarians, athletes tracking macros, and anyone comparing sunflower seeds with other high-protein snacks.
Use the preset buttons for common grocery packs — a 28 g handful, a 50 g trail-mix scoop, or a 32 g tablespoon of sunflower butter — then adjust units between grams and ounces. Results stay on a 100 g basis so labels, recipes, and food logs stay comparable.
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The Math Behind It
Protein per 100 grams is a density figure: grams of protein divided by grams of edible food, then scaled to 100. For sunflower products the USDA FoodData Central averages sit near 20.8 g protein per 100 g of hulled kernels, 19.3 g per 100 g of sunflower seed butter, and about 48 g per 100 g of defatted sunflower seed flour. The calculator multiplies your edible grams by that density and divides by 100.
In-shell seeds need an extra yield step. The woody hull is not eaten. Typical kernel yield is about 46% of in-shell weight, so 50 g of in-shell seeds contribute roughly 23 g of edible kernel and about 4.8 g of protein. Oil roasting slightly dilutes protein because added oil increases weight without adding protein; dry roasting concentrates protein a little as moisture leaves. Those adjustments are small (a few percent) but they keep roasted snack packs honest next to raw kernels.
If you are comparing sunflower seeds with other snack proteins, keep the same 100 g basis. A 28 g handful of hulled kernels delivers about 5.8 g of protein. Two tablespoons (32 g) of sunflower butter deliver about 6.2 g. A 20 g scoop of sunflower flour mixed into oatmeal can add nearly 10 g. The 100 g figure lets you line those portions up without mixing household units.
Worked Examples
Example 1 — afternoon handful. You eat 28 g of dry-roasted hulled kernels. Protein density is about 21.2 g/100 g after a small roast concentration. Protein = 28 × 21.2 / 100 = 5.9 g. That is roughly 12% of a 50 g plant-protein target and about 164 kcal if you include energy context.
Example 3 — in-shell ballpark snack. A 50 g bag of in-shell seeds yields about 23 g of kernels. Protein = 23 × 20.8 / 100 = 4.8 g. People often overestimate in-shell portions because the hulls look bulky; the yield correction prevents that.
Example 4 — baking with sunflower flour. A muffin recipe uses 40 g of sunflower seed flour. At 48.1 g protein per 100 g, that single ingredient adds 19.2 g of protein across the batch. Split into four muffins and each muffin carries about 4.8 g from the flour alone, before eggs or dairy.
Standard Values
These reference densities are rounded USDA-style averages for commonly sold products. Brand labels can differ by a gram or two depending on roast, added oil, and how finely the seed is milled.
| Product (edible) | Protein (g/100 g) | Energy (kcal/100 g) | Fat (g/100 g) |
|---|---|---|---|
| Hulled kernels, raw | 20.8 | 584 | 51.5 |
| Hulled kernels, dry roasted | 21.2 | 592 | 51.3 |
| Hulled kernels, oil roasted | 20.0 | 619 | 55.5 |
| Sunflower seed butter | 19.3 | 617 | 55.2 |
| Sunflower seed flour / meal | 48.1 | 326 | 1.6 |
| Sprouted hulled kernels | 22.8 | 546 | 47.0 |
A 28 g (1 oz) label serving of hulled kernels is the grocery-store default in the United States. That serving is about 5.8 g protein, 163 kcal, and 14 g fat. Sunflower butter is usually labeled per 2 tablespoons (32 g). If you log food in ounces, 1 oz equals 28.35 g; the calculator converts automatically so you do not have to.
Tips & Best Practices
Weigh kernels after hulling if you buy in-shell. Counting whole seeds by the bag overstates protein because half the weight never gets eaten. For butter, level the spoon; heaping tablespoons can jump from 16 g to 22 g and add another gram of protein plus extra oil calories.
Watch sodium on salted snack packs. Protein barely changes, but 200–300 mg of sodium per handful adds up if you also use salted butter or crackers. Unsalted dry-roasted kernels keep the same protein density with far less sodium.
If you are building a calorie budget around seed snacks, remember that sunflower kernels are closer to nuts than to lean protein foods. Five to six grams of protein arrive with 160-plus calories. For a leaner protein-per-calorie ratio, sunflower flour in cooked dishes beats a straight handful of oil-roasted seeds. People comparing snack calories may also like the chip protein calculator when deciding between seeds and savory chips.
Common Mistakes to Avoid
Do not treat “per 100 g” as “per serving.” A 100 g pile of kernels is about 3.5 typical handfuls and more than 580 kcal. Logging 20.8 g of protein against a 28 g handful inflates your protein by a factor of three. Always scale to the grams you actually ate.
Another frequent error is mixing wet and dry weights. Soaked or sprouted kernels pick up water; protein per 100 g of the wet product falls even though the seed’s original protein is unchanged. If you sprout at home, weigh after draining and use the sprouted option, or weigh the dry kernels before soaking and use the hulled value.
Oil-roasted “honey roasted” mixes often include sugar coatings. Protein per 100 g drops because sugar and oil dilute the seed. If the label lists protein, prefer the label over a generic kernel figure. The calculator’s oil-roast adjustment covers plain oil, not candy coatings.
Frequently Asked Questions
Are sunflower seeds a good protein source? They are a solid plant source for snacks and baking, typically 19–23 g protein per 100 g of kernels or butter. They are not as protein-dense per calorie as chicken, Greek yogurt, or isolated protein powders, but they add fiber, vitamin E, magnesium, and unsaturated fat at the same time.
How do sunflower seeds compare with chia or flax? Hulled sunflower kernels usually beat chia and flax on protein per 100 g (chia is often around 17 g; flax around 18 g) while those seeds win on fiber and omega-3s. If fiber is your main goal, try the chia fiber per 100g calculator alongside this one.
Does roasting destroy protein? Normal kitchen or factory roasting does not meaningfully destroy sunflower protein. It can change texture and slightly concentrate or dilute the number depending on moisture loss and added oil. Extreme burning is a flavor problem, not a protein-math problem.
Where do the numbers come from? Baseline densities follow USDA FoodData Central entries for sunflower seed kernels, roasted kernels, sunflower butter, and sunflower seed flour. Brand formulas vary; when a Nutrition Facts panel is on the jar, use that protein-per-serving figure and this tool to rescale it to 100 g if you need a common basis.
Authoritative references include the USDA FoodData Central database and the Dietary Guidelines for Americans protein discussion. Wikipedia’s overview of sunflower seed composition is a readable starting point for seed anatomy and typical uses.