Flaxseed is famous for fiber and omega-3s, but it also brings a quiet but useful amount of potassium. A 100-gram serving of raw flaxseed delivers about 813 mg of potassium — roughly 17% of the recommended Daily Value. That number matters if you are tracking electrolytes, planning a plant-based diet, or working toward a daily potassium goal.
This calculator converts any portion of flaxseed — grams, ounces, or tablespoons — into milligrams of potassium and shows how much of the Daily Value it covers. Whether you sprinkle ground flax on oatmeal, blend it into smoothies, or bake it into muffins, enter your usual portion and get an instant estimate. You will also see the equivalent grams and a clear percentage of the 4,700 mg Daily Value.
Built for meal trackers, nutrition students, and anyone curious about the micronutrient profile of this small seed, the tool uses USDA nutrient data for raw flaxseed and gives you a fast, practical number you can log with confidence.
How Flaxseed Potassium Is Calculated
The calculator starts with the USDA nutrient value for raw flaxseed: 813 mg of potassium per 100 grams. That is the same value used in the USDA FoodData Central database and on many modern nutrition labels. To find your portion's potassium, the calculator first converts your selected unit into grams, then applies this simple ratio:
So a 10 g serving gives 81.3 mg, and a 50 g serving gives 406.5 mg. For ounce and tablespoon entries, the conversion uses 28.35 g per ounce and 7 g per tablespoon of ground flaxseed. If you scoop whole flaxseed, a tablespoon may weigh closer to 10.9 g, so you can switch the unit to grams and enter the exact scale weight for a more precise result. The Daily Value used for the percentage is 4,700 mg, the FDA reference amount for potassium on food labels.
Note that grinding, soaking, or baking flaxseed does not change its potassium concentration. Water and oil displace calories and fat, but not the mineral content of the seed itself.
Worked Examples
Example 1 — Smoothie scoop (2 tablespoons / 14 g)
Potassium = 14 g × 8.13 = 113.8 mg, about 2.4% of the Daily Value.
Example 2 — A 40 g bag of ground flaxseed
Potassium = 40 × 8.13 = 325.2 mg, about 6.9% of the Daily Value.
Example 3 — A 28.35 g ounce of flaxseed
Potassium = 28.35 × 8.13 = 230.5 mg, about 4.9% of the Daily Value.
These examples show that flaxseed is not a potassium heavyweight the way potatoes or white beans are, but it contributes meaningful amounts when eaten consistently. Because flax is often added to oats, yogurt, pancakes, and smoothie bowls, it can quietly add 100–300 mg to your daily total.
Reference Table: Potassium in Common Flaxseed Portions
| Portion | Weight | Potassium | % Daily Value |
|---|---|---|---|
| 1 tablespoon ground | 7 g | 56.9 mg | 1.2% |
| 2 tablespoons ground | 14 g | 113.8 mg | 2.4% |
| 1 ounce | 28.35 g | 230.5 mg | 4.9% |
| 50 g | 50 g | 406.5 mg | 8.6% |
| 100 g | 100 g | 813 mg | 17.3% |
All values are rounded and based on raw flaxseed. If your package label shows a slightly different number, trust the label — flax varieties and processing can cause small differences.
When This Calculator Is Actually Useful
Flaxseed rarely appears on potassium-focused food lists, but this estimate matters in a few real situations. If you follow a high-potassium eating plan for blood pressure support, track electrolytes for endurance training, or use a nutrition app that asks for foods in grams and ounces, these numbers help you fill in gaps. It is especially handy for people on a renal or kidney-friendly diet, where potassium limits are strict and even a tablespoon needs to be counted. Running the numbers once for your usual portion gives you a reusable mental reference for every future meal.
The calculator also helps if you eat flaxseed daily and wonder whether it is meaningfully moving your potassium total. A typical 2-tablespoon portion covers only about 2.4% of the Daily Value, so it is a supporting player, not a primary source.
Tips for Accurate Tracking
- Weigh flaxseed on a digital scale. Volume measurements are convenient but can vary by more than 20% depending on grind and how densely the spoon is packed.
- Use ground flaxseed if you want the nutrition you measure. Whole seeds can pass through the digestive tract partially intact, so you may not absorb all the potassium they contain.
- Treat the Daily Value as a general target. Endurance athletes, people who sweat heavily, and those taking certain medications may have different potassium needs.
- Check the label on packaged flax products. Ground flax mixed with chia, seeds, seasonings, or protein powder will have a different potassium value than plain flaxseed.
Frequently Asked Questions
Is flaxseed a good source of potassium compared with other foods?
It is moderate. A 2-tablespoon serving provides about 114 mg, while a medium banana gives roughly 422 mg and a 100 g serving of baked potato provides around 535 mg. Flaxseed's main strengths are fiber, the omega-3 alpha-linolenic acid, and lignans; potassium is a useful bonus rather than the primary reason to eat it.
Can I use this calculator for flaxseed oil?
No. Flaxseed oil contains almost no potassium because potassium is water-soluble and stays with the solids during pressing. Use this tool only for whole seeds, ground flax, or flax meal with no added oils.
What about flaxseed meal or flax powder?
Flaxseed meal is just ground flaxseed, so the potassium value is identical per gram, provided nothing else is added. The calculator's tablespoon setting uses 7 g, which is the typical weight for ground flax; if your brand is denser, use the gram setting and weigh it.
Does roasting or baking change the potassium content?
No significant change. Heat does not destroy minerals. If flaxseed is baked into bread or crackers, the potassium stays with the seed, though a recipe with other ingredients will change the per-serving total.
Further Reading and Reliable Sources
- NIH Office of Dietary Supplements — Potassium Health Professional Fact Sheet
- USDA FoodData Central — Flaxseed Nutrient Search
- FDA — Nutrition Information Label Guidance
Use these sources when you want to check updated Daily Value recommendations, compare food composition data, or review how potassium appears on nutrition labels.