Mustard is one of the lowest-calorie condiments, but it isn’t protein-free. This Mustard Protein Per 100g Calculator tells you exactly how much protein is in the mustard you actually use — whether it’s a dab on a sandwich, a spoonful in a vinaigrette, or a full 100 g batch in a marinade.
Prepared mustard varieties contain roughly 4 to 5 g of protein per 100 g. Because mustard is usually eaten in tiny servings, that translates to about 0.2 g per teaspoon. This tool lets you select a mustard type or enter your own protein value, then calculates protein for teaspoons, tablespoons, grams, or ounces. It also shows how that protein fits into your daily target.
Use it for meal prep, macro tracking, or just satisfying your curiosity about a condiment that often slips under the nutrition radar.
🥫 Mustard Protein Per 100g Calculator
Work out the protein in any serving of mustard and see how it fits your daily protein target.
How to Use This Tool
Select a mustard variety from the dropdown, or choose Custom protein value if your brand lists a different number on its nutrition label. Next, enter the amount you plan to use — the calculator accepts teaspoons, tablespoons, grams, or ounces. If you want to see how the mustard fits into your daily protein intake, add your goal in grams. Press Calculate to see the estimated protein, and use the reset or copy buttons to start over or save the result.
How It Works: Protein in Prepared Mustard
Mustard seeds are naturally rich in protein — around 25–30 g per 100 g of whole seeds. But prepared mustard is mostly water and vinegar, so the protein concentration drops to roughly 4–5 g per 100 g depending on the variety and recipe. The calculator uses this standard formula:
Protein (g) = (protein per 100 g ÷ 100) × amount in grams
For volume-based servings, the calculator converts using common approximations: 1 teaspoon ≈ 5 g, 1 tablespoon ≈ 15 g, and 1 ounce ≈ 28.35 g.
Because mustard is almost always eaten in small amounts, the final protein number is typically modest. Even a generous tablespoon of yellow mustard supplies around 0.7 g of protein — less than 1% of a 120 g daily target, yet still worth tracking if you log everything.
Worked Examples
Example 1: You add 1 tbsp of Dijon mustard to a salad dressing. Dijon contains about 4.0 g protein per 100 g. Weight = 15 g. Protein = (4.0 ÷ 100) × 15 = 0.60 g.
Example 2: You eat 2 tsp of whole grain mustard on a sandwich. Whole grain mustard has about 5.0 g protein per 100 g. Weight = 10 g. Protein = (5.0 ÷ 100) × 10 = 0.50 g.
Scaling a recipe: A marinade calls for 100 g of yellow mustard. At 4.4 g protein per 100 g, the entire marinade adds 4.4 g protein. If the marinade serves four, that's 1.1 g protein per serving from mustard alone.
Reference Table: Protein by Mustard Type
| Mustard type | Protein per 100 g | Protein per tsp (5 g) | Protein per tbsp (15 g) |
|---|---|---|---|
| Yellow / American | 4.4 g | 0.22 g | 0.66 g |
| Dijon | 4.0 g | 0.20 g | 0.60 g |
| Spicy brown | 4.6 g | 0.23 g | 0.69 g |
| Whole grain | 5.0 g | 0.25 g | 0.75 g |
| Mustard powder (dry) | 23–30 g | 1.2–1.5 g | 3.5–4.5 g |
Values are averages from U.S. Department of Agriculture FoodData Central entries and common brand labels; your brand may vary by a fraction of a gram.
Accuracy and Practical Limits
Prepared mustard is not a standardized product. Different brands use different seed blends, vinegar dilutions, sweeteners, and thickeners, so the protein can range from about 3.5 to 6 g per 100 g. If precise tracking matters, read the label on your jar and use the custom protein field.
Volume conversions are approximate. Mustard density can vary, and a rounded teaspoon holds more than a level teaspoon. Weighing mustard in grams is the most accurate method, especially for large recipe quantities.
Watch out: Mustard powders and mustard seeds are much more protein-dense than prepared mustards. If you are using dry mustard powder in spice rubs or pickling brine, do not use the prepared-mustard value — use the custom field with the powder's label value.
Frequently Asked Questions
Is mustard a meaningful protein source?
Not really. A typical serving provides less than 1 g of protein, so mustard should not be counted on as a protein source. It is better understood as a flavor enhancer with negligible protein and calories. For actual protein-dense plant foods, compare it with tools like this fruit protein per 100g calculator or a corn protein calculator.
Why does dry mustard powder have so much more protein?
Powder is the ground seed with moisture removed. Because the seed is roughly one-quarter protein, dry powder contains about 23–30 g protein per 100 g, while prepared mustard is diluted with vinegar and water to a spreadable consistency. That dilution explains the five-fold difference.
Does cooking destroy mustard protein?
No. Protein is not destroyed by normal cooking temperatures in any meaningful way. Heat can denature proteins, which changes their shape, but the amino acids and the protein count remain essentially the same, so cooked mustard dishes still contain the protein listed on the label.
Where do the reference values come from?
The preset values are based on typical USDA FoodData Central entries for prepared yellow mustard, Dijon mustard, and mustard seed, cross-checked with common brand nutrition labels. You can search specific foods at USDA FoodData Central.